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data/mdn-content/files/en-us/web/javascript/reference/operators | data/mdn-content/files/en-us/web/javascript/reference/operators/subtraction_assignment/index.md | ---
title: Subtraction assignment (-=)
slug: Web/JavaScript/Reference/Operators/Subtraction_assignment
page-type: javascript-operator
browser-compat: javascript.operators.subtraction_assignment
---
{{jsSidebar("Operators")}}
The **subtraction assignment (`-=`)** operator performs [subtraction](/en-US/docs/Web/JavaScr... | 0 |
data/mdn-content/files/en-us/web/javascript/reference/operators | data/mdn-content/files/en-us/web/javascript/reference/operators/optional_chaining/index.md | ---
title: Optional chaining (?.)
slug: Web/JavaScript/Reference/Operators/Optional_chaining
page-type: javascript-operator
browser-compat: javascript.operators.optional_chaining
---
{{jsSidebar("Operators")}}
The **optional chaining (`?.`)** operator accesses an object's property or calls a function. If the object a... | 0 |
data/mdn-content/files/en-us/web/javascript/reference/operators | data/mdn-content/files/en-us/web/javascript/reference/operators/new/index.md | ---
title: new
slug: Web/JavaScript/Reference/Operators/new
page-type: javascript-operator
browser-compat: javascript.operators.new
---
{{jsSidebar("Operators")}}
The **`new`** operator lets developers create an instance of a user-defined object type or of one of the built-in object types that has a constructor funct... | 0 |
data/mdn-content/files/en-us/web/javascript/reference/operators | data/mdn-content/files/en-us/web/javascript/reference/operators/operator_precedence/index.md | ---
title: Operator precedence
slug: Web/JavaScript/Reference/Operators/Operator_precedence
page-type: guide
---
{{jsSidebar("Operators")}}
**Operator precedence** determines how operators are parsed concerning each other. Operators with higher precedence become the operands of operators with lower precedence.
{{Emb... | 0 |
data/mdn-content/files/en-us/web/javascript/reference/operators | data/mdn-content/files/en-us/web/javascript/reference/operators/nullish_coalescing_assignment/index.md | ---
title: Nullish coalescing assignment (??=)
slug: Web/JavaScript/Reference/Operators/Nullish_coalescing_assignment
page-type: javascript-operator
browser-compat: javascript.operators.nullish_coalescing_assignment
---
{{jsSidebar("Operators")}}
The **nullish coalescing assignment (`??=`)** operator, also known as t... | 0 |
data/mdn-content/files/en-us/web/javascript/reference/operators | data/mdn-content/files/en-us/web/javascript/reference/operators/class/index.md | ---
title: class expression
slug: Web/JavaScript/Reference/Operators/class
page-type: javascript-operator
browser-compat: javascript.operators.class
---
{{jsSidebar("Operators")}}
The **`class`** keyword can be used to define a class inside an expression.
You can also define classes using the [`class` declaration](/... | 0 |
data/mdn-content/files/en-us/web/javascript/reference/operators | data/mdn-content/files/en-us/web/javascript/reference/operators/property_accessors/index.md | ---
title: Property accessors
slug: Web/JavaScript/Reference/Operators/Property_accessors
page-type: javascript-operator
browser-compat: javascript.operators.property_accessors
---
{{jsSidebar("Operators")}}
**Property accessors** provide access to an object's properties by using the dot notation or the bracket notat... | 0 |
data/mdn-content/files/en-us/web/javascript/reference/operators | data/mdn-content/files/en-us/web/javascript/reference/operators/multiplication/index.md | ---
title: Multiplication (*)
slug: Web/JavaScript/Reference/Operators/Multiplication
page-type: javascript-operator
browser-compat: javascript.operators.multiplication
---
{{jsSidebar("Operators")}}
The **multiplication (`*`)** operator produces the product of the operands.
{{EmbedInteractiveExample("pages/js/expre... | 0 |
data/mdn-content/files/en-us/web/javascript/reference/operators | data/mdn-content/files/en-us/web/javascript/reference/operators/yield_star_/index.md | ---
title: yield*
slug: Web/JavaScript/Reference/Operators/yield*
page-type: javascript-operator
browser-compat: javascript.operators.yield_star
---
{{jsSidebar("Operators")}}
The **`yield*`** operator is used to delegate to another [iterable](/en-US/docs/Web/JavaScript/Reference/Iteration_protocols#the_iterable_prot... | 0 |
data/mdn-content/files/en-us/web/javascript/reference/operators | data/mdn-content/files/en-us/web/javascript/reference/operators/comma_operator/index.md | ---
title: Comma operator (,)
slug: Web/JavaScript/Reference/Operators/Comma_operator
page-type: javascript-operator
browser-compat: javascript.operators.comma
---
{{jsSidebar("Operators")}}
The **comma (`,`)** operator evaluates each of its operands (from left to right) and returns the value of the last operand. Thi... | 0 |
data/mdn-content/files/en-us/web/javascript/reference/operators | data/mdn-content/files/en-us/web/javascript/reference/operators/import/index.md | ---
title: import()
slug: Web/JavaScript/Reference/Operators/import
page-type: javascript-operator
browser-compat: javascript.operators.import
---
{{jsSidebar("Operators")}}
The **`import()`** syntax, commonly called _dynamic import_, is a function-like expression that allows loading an ECMAScript module asynchronous... | 0 |
data/mdn-content/files/en-us/web/javascript/reference/operators | data/mdn-content/files/en-us/web/javascript/reference/operators/grouping/index.md | ---
title: Grouping operator ( )
slug: Web/JavaScript/Reference/Operators/Grouping
page-type: javascript-operator
browser-compat: javascript.operators.grouping
---
{{jsSidebar("Operators")}}
The **grouping `( )`** operator controls the precedence of evaluation in expressions. It also acts as a container for arbitrary... | 0 |
data/mdn-content/files/en-us/web/javascript/reference/operators | data/mdn-content/files/en-us/web/javascript/reference/operators/greater_than/index.md | ---
title: Greater than (>)
slug: Web/JavaScript/Reference/Operators/Greater_than
page-type: javascript-operator
browser-compat: javascript.operators.greater_than
---
{{jsSidebar("Operators")}}
The **greater than (`>`)** operator returns `true` if the left
operand is greater than the right operand, and `false` otherw... | 0 |
data/mdn-content/files/en-us/web/javascript/reference/operators | data/mdn-content/files/en-us/web/javascript/reference/operators/division/index.md | ---
title: Division (/)
slug: Web/JavaScript/Reference/Operators/Division
page-type: javascript-operator
browser-compat: javascript.operators.division
---
{{jsSidebar("Operators")}}
The **division (`/`)** operator produces the quotient of its operands where the left operand is the dividend and the right operand is th... | 0 |
data/mdn-content/files/en-us/web/javascript/reference/operators | data/mdn-content/files/en-us/web/javascript/reference/operators/nullish_coalescing/index.md | ---
title: Nullish coalescing operator (??)
slug: Web/JavaScript/Reference/Operators/Nullish_coalescing
page-type: javascript-operator
browser-compat: javascript.operators.nullish_coalescing
---
{{jsSidebar("Operators")}}
The **nullish coalescing (`??`)** operator is a logical
operator that returns its right-hand sid... | 0 |
data/mdn-content/files/en-us/web/javascript/reference/operators | data/mdn-content/files/en-us/web/javascript/reference/operators/logical_and/index.md | ---
title: Logical AND (&&)
slug: Web/JavaScript/Reference/Operators/Logical_AND
page-type: javascript-operator
browser-compat: javascript.operators.logical_and
---
{{jsSidebar("Operators")}}
The **logical AND (`&&`)** (logical conjunction) operator for a set of boolean operands will be `true` if and only if all the ... | 0 |
data/mdn-content/files/en-us/web/javascript/reference/operators | data/mdn-content/files/en-us/web/javascript/reference/operators/division_assignment/index.md | ---
title: Division assignment (/=)
slug: Web/JavaScript/Reference/Operators/Division_assignment
page-type: javascript-operator
browser-compat: javascript.operators.division_assignment
---
{{jsSidebar("Operators")}}
The **division assignment (`/=`)** operator performs [division](/en-US/docs/Web/JavaScript/Reference/O... | 0 |
data/mdn-content/files/en-us/web/javascript/reference/operators | data/mdn-content/files/en-us/web/javascript/reference/operators/equality/index.md | ---
title: Equality (==)
slug: Web/JavaScript/Reference/Operators/Equality
page-type: javascript-operator
browser-compat: javascript.operators.equality
---
{{jsSidebar("Operators")}}
The **equality (`==`)** operator checks whether its two operands are equal,
returning a Boolean result.
Unlike the [strict equality](/e... | 0 |
data/mdn-content/files/en-us/web/javascript/reference/operators | data/mdn-content/files/en-us/web/javascript/reference/operators/instanceof/index.md | ---
title: instanceof
slug: Web/JavaScript/Reference/Operators/instanceof
page-type: javascript-operator
browser-compat: javascript.operators.instanceof
---
{{jsSidebar("Operators")}}
The **`instanceof`** operator tests to see if the `prototype` property of a constructor appears anywhere in the prototype chain of an ... | 0 |
data/mdn-content/files/en-us/web/javascript/reference/operators | data/mdn-content/files/en-us/web/javascript/reference/operators/super/index.md | ---
title: super
slug: Web/JavaScript/Reference/Operators/super
page-type: javascript-language-feature
browser-compat: javascript.operators.super
---
{{jsSidebar("Operators")}}
The **`super`** keyword is used to access properties on an object literal or class's [[Prototype]], or invoke a superclass's constructor.
Th... | 0 |
data/mdn-content/files/en-us/web/javascript/reference/operators | data/mdn-content/files/en-us/web/javascript/reference/operators/right_shift/index.md | ---
title: Right shift (>>)
slug: Web/JavaScript/Reference/Operators/Right_shift
page-type: javascript-operator
browser-compat: javascript.operators.right_shift
---
{{jsSidebar("Operators")}}
The **right shift (`>>`)** operator returns a number or BigInt whose binary representation is the first operand shifted by the... | 0 |
data/mdn-content/files/en-us/web/javascript/reference/operators | data/mdn-content/files/en-us/web/javascript/reference/operators/exponentiation/index.md | ---
title: Exponentiation (**)
slug: Web/JavaScript/Reference/Operators/Exponentiation
page-type: javascript-operator
browser-compat: javascript.operators.exponentiation
---
{{jsSidebar("Operators")}}
The **exponentiation (`**`)** operator returns the result of raising the first operand to the power of the second ope... | 0 |
data/mdn-content/files/en-us/web/javascript/reference/operators | data/mdn-content/files/en-us/web/javascript/reference/operators/bitwise_xor_assignment/index.md | ---
title: Bitwise XOR assignment (^=)
slug: Web/JavaScript/Reference/Operators/Bitwise_XOR_assignment
page-type: javascript-operator
browser-compat: javascript.operators.bitwise_xor_assignment
---
{{jsSidebar("Operators")}}
The **bitwise XOR assignment (`^=`)** operator performs [bitwise XOR](/en-US/docs/Web/JavaScr... | 0 |
data/mdn-content/files/en-us/web/javascript/reference/operators | data/mdn-content/files/en-us/web/javascript/reference/operators/new.target/index.md | ---
title: new.target
slug: Web/JavaScript/Reference/Operators/new.target
page-type: javascript-language-feature
browser-compat: javascript.operators.new_target
---
{{jsSidebar("Operators")}}
The **`new.target`** meta-property lets you detect whether a function or constructor was called using the [`new`](/en-US/docs/... | 0 |
data/mdn-content/files/en-us/web/javascript/reference/operators | data/mdn-content/files/en-us/web/javascript/reference/operators/function_star_/index.md | ---
title: function* expression
slug: Web/JavaScript/Reference/Operators/function*
page-type: javascript-operator
browser-compat: javascript.operators.generator_function
---
{{jsSidebar("Operators")}}
The **`function*`** keyword can be used to define a generator function inside an expression.
You can also define gen... | 0 |
data/mdn-content/files/en-us/web/javascript/reference/operators | data/mdn-content/files/en-us/web/javascript/reference/operators/bitwise_xor/index.md | ---
title: Bitwise XOR (^)
slug: Web/JavaScript/Reference/Operators/Bitwise_XOR
page-type: javascript-operator
browser-compat: javascript.operators.bitwise_xor
---
{{jsSidebar("Operators")}}
The **bitwise XOR (`^`)** operator returns a number or BigInt whose binary representation has a `1` in each bit position for wh... | 0 |
data/mdn-content/files/en-us/web/javascript/reference/operators | data/mdn-content/files/en-us/web/javascript/reference/operators/greater_than_or_equal/index.md | ---
title: Greater than or equal (>=)
slug: Web/JavaScript/Reference/Operators/Greater_than_or_equal
page-type: javascript-operator
browser-compat: javascript.operators.greater_than_or_equal
---
{{jsSidebar("Operators")}}
The **greater than or equal (`>=`)** operator returns `true` if
the left operand is greater than... | 0 |
data/mdn-content/files/en-us/web/javascript/reference/operators | data/mdn-content/files/en-us/web/javascript/reference/operators/addition_assignment/index.md | ---
title: Addition assignment (+=)
slug: Web/JavaScript/Reference/Operators/Addition_assignment
page-type: javascript-operator
browser-compat: javascript.operators.addition_assignment
---
{{jsSidebar("Operators")}}
The **addition assignment (`+=`)** operator performs [addition](/en-US/docs/Web/JavaScript/Reference/O... | 0 |
data/mdn-content/files/en-us/web/javascript/reference/operators | data/mdn-content/files/en-us/web/javascript/reference/operators/bitwise_and/index.md | ---
title: Bitwise AND (&)
slug: Web/JavaScript/Reference/Operators/Bitwise_AND
page-type: javascript-operator
browser-compat: javascript.operators.bitwise_and
---
{{jsSidebar("Operators")}}
The **bitwise AND (`&`)** operator returns a number or BigInt whose binary representation has a `1` in each bit position for wh... | 0 |
data/mdn-content/files/en-us/web/javascript/reference/operators | data/mdn-content/files/en-us/web/javascript/reference/operators/addition/index.md | ---
title: Addition (+)
slug: Web/JavaScript/Reference/Operators/Addition
page-type: javascript-operator
browser-compat: javascript.operators.addition
---
{{jsSidebar("Operators")}}
The **addition (`+`)** operator produces the sum of numeric operands or string concatenation.
{{EmbedInteractiveExample("pages/js/expre... | 0 |
data/mdn-content/files/en-us/web/javascript/reference/operators | data/mdn-content/files/en-us/web/javascript/reference/operators/void/index.md | ---
title: void operator
slug: Web/JavaScript/Reference/Operators/void
page-type: javascript-operator
browser-compat: javascript.operators.void
---
{{jsSidebar("Operators")}}
The **`void`** operator evaluates the given
`expression` and then returns {{jsxref("undefined")}}.
{{EmbedInteractiveExample("pages/js/express... | 0 |
data/mdn-content/files/en-us/web/javascript/reference/operators | data/mdn-content/files/en-us/web/javascript/reference/operators/bitwise_not/index.md | ---
title: Bitwise NOT (~)
slug: Web/JavaScript/Reference/Operators/Bitwise_NOT
page-type: javascript-operator
browser-compat: javascript.operators.bitwise_not
---
{{jsSidebar("Operators")}}
The **bitwise NOT (`~`)** operator returns a number or BigInt whose binary representation has a `1` in each bit position for wh... | 0 |
data/mdn-content/files/en-us/web/javascript/reference/operators | data/mdn-content/files/en-us/web/javascript/reference/operators/await/index.md | ---
title: await
slug: Web/JavaScript/Reference/Operators/await
page-type: javascript-operator
browser-compat: javascript.operators.await
---
{{jsSidebar("Operators")}}
The **`await`** operator is used to wait for a {{jsxref("Promise")}} and get its fulfillment value. It can only be used inside an [async function](/e... | 0 |
data/mdn-content/files/en-us/web/javascript/reference/operators | data/mdn-content/files/en-us/web/javascript/reference/operators/unary_plus/index.md | ---
title: Unary plus (+)
slug: Web/JavaScript/Reference/Operators/Unary_plus
page-type: javascript-operator
browser-compat: javascript.operators.unary_plus
---
{{jsSidebar("Operators")}}
The **unary plus (`+`)** operator precedes its operand and evaluates to its
operand but attempts to [convert it into a number](/en... | 0 |
data/mdn-content/files/en-us/web/javascript/reference/operators | data/mdn-content/files/en-us/web/javascript/reference/operators/remainder_assignment/index.md | ---
title: Remainder assignment (%=)
slug: Web/JavaScript/Reference/Operators/Remainder_assignment
page-type: javascript-operator
browser-compat: javascript.operators.remainder_assignment
---
{{jsSidebar("Operators")}}
The **remainder assignment (`%=`)** operator performs [remainder](/en-US/docs/Web/JavaScript/Refere... | 0 |
data/mdn-content/files/en-us/web/javascript/reference/operators | data/mdn-content/files/en-us/web/javascript/reference/operators/delete/index.md | ---
title: delete
slug: Web/JavaScript/Reference/Operators/delete
page-type: javascript-operator
browser-compat: javascript.operators.delete
---
{{jsSidebar("Operators")}}
The **`delete`** operator removes a property from an object. If the property's value is an object and there are no more references to the object, ... | 0 |
data/mdn-content/files/en-us/web/javascript/reference/operators | data/mdn-content/files/en-us/web/javascript/reference/operators/left_shift/index.md | ---
title: Left shift (<<)
slug: Web/JavaScript/Reference/Operators/Left_shift
page-type: javascript-operator
browser-compat: javascript.operators.left_shift
---
{{jsSidebar("Operators")}}
The **left shift (`<<`)** operator returns a number or BigInt whose binary representation is the first operand shifted by the spe... | 0 |
data/mdn-content/files/en-us/web/javascript/reference/operators | data/mdn-content/files/en-us/web/javascript/reference/operators/strict_equality/index.md | ---
title: Strict equality (===)
slug: Web/JavaScript/Reference/Operators/Strict_equality
page-type: javascript-operator
browser-compat: javascript.operators.strict_equality
---
{{jsSidebar("Operators")}}
The **strict equality (`===`)** operator checks whether its two operands are
equal, returning a Boolean result. U... | 0 |
data/mdn-content/files/en-us/web/javascript/reference/operators | data/mdn-content/files/en-us/web/javascript/reference/operators/assignment/index.md | ---
title: Assignment (=)
slug: Web/JavaScript/Reference/Operators/Assignment
page-type: javascript-operator
browser-compat: javascript.operators.assignment
---
{{jsSidebar("Operators")}}
The **assignment (`=`)** operator is used to assign a value to a variable or property. The assignment expression itself has a valu... | 0 |
data/mdn-content/files/en-us/web/javascript/reference/operators | data/mdn-content/files/en-us/web/javascript/reference/operators/yield/index.md | ---
title: yield
slug: Web/JavaScript/Reference/Operators/yield
page-type: javascript-operator
browser-compat: javascript.operators.yield
---
{{jsSidebar("Operators")}}
The **`yield`** operator is used to pause and resume a [generator function](/en-US/docs/Web/JavaScript/Reference/Statements/function*).
{{EmbedInter... | 0 |
data/mdn-content/files/en-us/web/javascript/reference/operators | data/mdn-content/files/en-us/web/javascript/reference/operators/unsigned_right_shift_assignment/index.md | ---
title: Unsigned right shift assignment (>>>=)
slug: Web/JavaScript/Reference/Operators/Unsigned_right_shift_assignment
page-type: javascript-operator
browser-compat: javascript.operators.unsigned_right_shift_assignment
---
{{jsSidebar("Operators")}}
The **unsigned right shift assignment (`>>>=`)** operator perfor... | 0 |
data/mdn-content/files/en-us/web/javascript/reference/operators | data/mdn-content/files/en-us/web/javascript/reference/operators/spread_syntax/index.md | ---
title: Spread syntax (...)
slug: Web/JavaScript/Reference/Operators/Spread_syntax
page-type: javascript-operator
browser-compat: javascript.operators.spread
---
{{jsSidebar("Operators")}}
The **spread (`...`)** syntax allows an iterable, such as an array or string, to be expanded in places where zero or more argu... | 0 |
data/mdn-content/files/en-us/web/javascript/reference/operators | data/mdn-content/files/en-us/web/javascript/reference/operators/right_shift_assignment/index.md | ---
title: Right shift assignment (>>=)
slug: Web/JavaScript/Reference/Operators/Right_shift_assignment
page-type: javascript-operator
browser-compat: javascript.operators.right_shift_assignment
---
{{jsSidebar("Operators")}}
The **right shift assignment (`>>=`)** operator performs [right shift](/en-US/docs/Web/JavaS... | 0 |
data/mdn-content/files/en-us/web/javascript/reference/operators | data/mdn-content/files/en-us/web/javascript/reference/operators/async_function_star_/index.md | ---
title: async function* expression
slug: Web/JavaScript/Reference/Operators/async_function*
page-type: javascript-operator
browser-compat: javascript.operators.async_generator_function
---
{{jsSidebar("Operators")}}
The **`async function*`** keywords can be used to define an async generator function inside an expr... | 0 |
data/mdn-content/files/en-us/web/javascript/reference/operators | data/mdn-content/files/en-us/web/javascript/reference/operators/unary_negation/index.md | ---
title: Unary negation (-)
slug: Web/JavaScript/Reference/Operators/Unary_negation
page-type: javascript-operator
browser-compat: javascript.operators.unary_negation
---
{{jsSidebar("Operators")}}
The **unary negation (`-`)** operator precedes its operand and negates it.
{{EmbedInteractiveExample("pages/js/expres... | 0 |
data/mdn-content/files/en-us/web/javascript/reference/operators | data/mdn-content/files/en-us/web/javascript/reference/operators/increment/index.md | ---
title: Increment (++)
slug: Web/JavaScript/Reference/Operators/Increment
page-type: javascript-operator
browser-compat: javascript.operators.increment
---
{{jsSidebar("Operators")}}
The **increment (`++`)** operator increments (adds one to) its operand and returns the value before or after the increment, dependin... | 0 |
data/mdn-content/files/en-us/web/javascript/reference/operators | data/mdn-content/files/en-us/web/javascript/reference/operators/bitwise_or_assignment/index.md | ---
title: Bitwise OR assignment (|=)
slug: Web/JavaScript/Reference/Operators/Bitwise_OR_assignment
page-type: javascript-operator
browser-compat: javascript.operators.bitwise_or_assignment
---
{{jsSidebar("Operators")}}
The **bitwise OR assignment (`|=`)** operator performs [bitwise OR](/en-US/docs/Web/JavaScript/R... | 0 |
data/mdn-content/files/en-us/web/javascript/reference/operators | data/mdn-content/files/en-us/web/javascript/reference/operators/logical_or_assignment/index.md | ---
title: Logical OR assignment (||=)
slug: Web/JavaScript/Reference/Operators/Logical_OR_assignment
page-type: javascript-operator
browser-compat: javascript.operators.logical_or_assignment
---
{{jsSidebar("Operators")}}
The **logical OR assignment (`||=`)** operator only evaluates the right operand and assigns to ... | 0 |
data/mdn-content/files/en-us/web/javascript/reference/operators | data/mdn-content/files/en-us/web/javascript/reference/operators/subtraction/index.md | ---
title: Subtraction (-)
slug: Web/JavaScript/Reference/Operators/Subtraction
page-type: javascript-operator
browser-compat: javascript.operators.subtraction
---
{{jsSidebar("Operators")}}
The **subtraction (`-`)** operator subtracts the two operands, producing their difference.
{{EmbedInteractiveExample("pages/js... | 0 |
data/mdn-content/files/en-us/web/javascript/reference/operators | data/mdn-content/files/en-us/web/javascript/reference/operators/strict_inequality/index.md | ---
title: Strict inequality (!==)
slug: Web/JavaScript/Reference/Operators/Strict_inequality
page-type: javascript-operator
browser-compat: javascript.operators.strict_inequality
---
{{jsSidebar("Operators")}}
The **strict inequality (`!==`)** operator checks whether its two operands are
not equal, returning a Boole... | 0 |
data/mdn-content/files/en-us/web/javascript/reference/operators | data/mdn-content/files/en-us/web/javascript/reference/operators/import.meta/index.md | ---
title: import.meta
slug: Web/JavaScript/Reference/Operators/import.meta
page-type: javascript-language-feature
browser-compat: javascript.operators.import_meta
---
{{jsSidebar("Operators")}}
The **`import.meta`** meta-property exposes context-specific metadata to a JavaScript module. It contains information about... | 0 |
data/mdn-content/files/en-us/web/javascript/reference/operators/import.meta | data/mdn-content/files/en-us/web/javascript/reference/operators/import.meta/resolve/index.md | ---
title: import.meta.resolve()
slug: Web/JavaScript/Reference/Operators/import.meta/resolve
page-type: javascript-language-feature
browser-compat: javascript.operators.import_meta.resolve
---
{{jsSidebar("Operators")}}
**`import.meta.resolve()`** is a built-in function defined on the [`import.meta`](/en-US/docs/Web... | 0 |
data/mdn-content/files/en-us/web/javascript/reference/operators | data/mdn-content/files/en-us/web/javascript/reference/operators/logical_or/index.md | ---
title: Logical OR (||)
slug: Web/JavaScript/Reference/Operators/Logical_OR
page-type: javascript-operator
browser-compat: javascript.operators.logical_or
---
{{jsSidebar("Operators")}}
The **logical OR (`||`)** (logical disjunction) operator for a set of operands
is true if and only if one or more of its operands... | 0 |
data/mdn-content/files/en-us/web/javascript/reference/operators | data/mdn-content/files/en-us/web/javascript/reference/operators/typeof/index.md | ---
title: typeof
slug: Web/JavaScript/Reference/Operators/typeof
page-type: javascript-operator
browser-compat: javascript.operators.typeof
---
{{jsSidebar("Operators")}}
The **`typeof`** operator returns a string indicating the type of the operand's value.
{{EmbedInteractiveExample("pages/js/expressions-typeof.htm... | 0 |
data/mdn-content/files/en-us/web/javascript/reference/operators | data/mdn-content/files/en-us/web/javascript/reference/operators/logical_not/index.md | ---
title: Logical NOT (!)
slug: Web/JavaScript/Reference/Operators/Logical_NOT
page-type: javascript-operator
browser-compat: javascript.operators.logical_not
---
{{jsSidebar("Operators")}}
The **logical NOT (`!`)** (logical complement, negation) operator takes truth to
falsity and vice versa. It is typically used w... | 0 |
data/mdn-content/files/en-us/web/javascript/reference/operators | data/mdn-content/files/en-us/web/javascript/reference/operators/logical_and_assignment/index.md | ---
title: Logical AND assignment (&&=)
slug: Web/JavaScript/Reference/Operators/Logical_AND_assignment
page-type: javascript-operator
browser-compat: javascript.operators.logical_and_assignment
---
{{jsSidebar("Operators")}}
The **logical AND assignment (`&&=`)** operator only evaluates the right operand and assigns... | 0 |
data/mdn-content/files/en-us/web/javascript/reference/operators | data/mdn-content/files/en-us/web/javascript/reference/operators/in/index.md | ---
title: in
slug: Web/JavaScript/Reference/Operators/in
page-type: javascript-operator
browser-compat: javascript.operators.in
---
{{jsSidebar("Operators")}}
The **`in`** operator returns `true` if the specified property is in the specified object or its prototype chain.
The `in` operator cannot be used to search ... | 0 |
data/mdn-content/files/en-us/web/javascript/reference/operators | data/mdn-content/files/en-us/web/javascript/reference/operators/less_than/index.md | ---
title: Less than (<)
slug: Web/JavaScript/Reference/Operators/Less_than
page-type: javascript-operator
browser-compat: javascript.operators.less_than
---
{{jsSidebar("Operators")}}
The **less than (`<`)** operator returns `true` if the left operand is less than the right operand, and `false` otherwise.
{{EmbedIn... | 0 |
data/mdn-content/files/en-us/web/javascript/reference | data/mdn-content/files/en-us/web/javascript/reference/functions/index.md | ---
title: Functions
slug: Web/JavaScript/Reference/Functions
page-type: guide
browser-compat: javascript.functions
---
{{jsSidebar("Functions")}}
Generally speaking, a function is a "subprogram" that can be _called_ by code external (or internal, in the case of recursion) to the function. Like the program itself, a ... | 0 |
data/mdn-content/files/en-us/web/javascript/reference/functions | data/mdn-content/files/en-us/web/javascript/reference/functions/get/index.md | ---
title: get
slug: Web/JavaScript/Reference/Functions/get
page-type: javascript-language-feature
browser-compat: javascript.functions.get
---
{{jsSidebar("Functions")}}
The **`get`** syntax binds an object property to a function that will be called when that property is looked up. It can also be used in [classes](/... | 0 |
data/mdn-content/files/en-us/web/javascript/reference/functions | data/mdn-content/files/en-us/web/javascript/reference/functions/set/index.md | ---
title: set
slug: Web/JavaScript/Reference/Functions/set
page-type: javascript-language-feature
browser-compat: javascript.functions.set
---
{{jsSidebar("Functions")}}
The **`set`** syntax binds an object property to a function to be called when there is an attempt to set that property. It can also be used in [cla... | 0 |
data/mdn-content/files/en-us/web/javascript/reference/functions | data/mdn-content/files/en-us/web/javascript/reference/functions/arguments/index.md | ---
title: The arguments object
slug: Web/JavaScript/Reference/Functions/arguments
page-type: javascript-language-feature
browser-compat: javascript.functions.arguments
---
{{jsSidebar("Functions")}}
**`arguments`** is an array-like object accessible inside [functions](/en-US/docs/Web/JavaScript/Guide/Functions) that... | 0 |
data/mdn-content/files/en-us/web/javascript/reference/functions/arguments | data/mdn-content/files/en-us/web/javascript/reference/functions/arguments/callee/index.md | ---
title: arguments.callee
slug: Web/JavaScript/Reference/Functions/arguments/callee
page-type: javascript-instance-data-property
status:
- deprecated
browser-compat: javascript.functions.arguments.callee
---
{{jsSidebar("Functions")}}{{Deprecated_Header}}
> **Note:** Accessing `arguments.callee` in [strict mode](... | 0 |
data/mdn-content/files/en-us/web/javascript/reference/functions/arguments | data/mdn-content/files/en-us/web/javascript/reference/functions/arguments/length/index.md | ---
title: arguments.length
slug: Web/JavaScript/Reference/Functions/arguments/length
page-type: javascript-instance-data-property
browser-compat: javascript.functions.arguments.length
---
{{jsSidebar("Functions")}}
The **`arguments.length`** data property contains the number of arguments passed to the function.
## ... | 0 |
data/mdn-content/files/en-us/web/javascript/reference/functions/arguments | data/mdn-content/files/en-us/web/javascript/reference/functions/arguments/@@iterator/index.md | ---
title: arguments[@@iterator]()
slug: Web/JavaScript/Reference/Functions/arguments/@@iterator
page-type: javascript-instance-method
browser-compat: javascript.functions.arguments.@@iterator
---
{{jsSidebar("Functions")}}
The **`[@@iterator]()`** method of {{jsxref("Functions/arguments", "arguments")}} objects impl... | 0 |
data/mdn-content/files/en-us/web/javascript/reference/functions | data/mdn-content/files/en-us/web/javascript/reference/functions/default_parameters/index.md | ---
title: Default parameters
slug: Web/JavaScript/Reference/Functions/Default_parameters
page-type: javascript-language-feature
browser-compat: javascript.functions.default_parameters
---
{{jsSidebar("Functions")}}
**Default function parameters** allow named parameters to be initialized with default values if no val... | 0 |
data/mdn-content/files/en-us/web/javascript/reference/functions | data/mdn-content/files/en-us/web/javascript/reference/functions/rest_parameters/index.md | ---
title: Rest parameters
slug: Web/JavaScript/Reference/Functions/rest_parameters
page-type: javascript-language-feature
browser-compat: javascript.functions.rest_parameters
---
{{jsSidebar("Functions")}}
The **rest parameter** syntax allows a function to accept an indefinite number of arguments as an array, provid... | 0 |
data/mdn-content/files/en-us/web/javascript/reference/functions | data/mdn-content/files/en-us/web/javascript/reference/functions/arrow_functions/index.md | ---
title: Arrow function expressions
slug: Web/JavaScript/Reference/Functions/Arrow_functions
page-type: javascript-language-feature
browser-compat: javascript.functions.arrow_functions
---
{{jsSidebar("Functions")}}
An **arrow function expression** is a compact alternative to a traditional [function expression](/en... | 0 |
data/mdn-content/files/en-us/web/javascript/reference/functions | data/mdn-content/files/en-us/web/javascript/reference/functions/method_definitions/index.md | ---
title: Method definitions
slug: Web/JavaScript/Reference/Functions/Method_definitions
page-type: javascript-language-feature
browser-compat: javascript.functions.method_definitions
---
{{jsSidebar("Functions")}}
**Method definition** is a shorter syntax for defining a function property in an object initializer. I... | 0 |
data/mdn-content/files/en-us/web/javascript/reference | data/mdn-content/files/en-us/web/javascript/reference/template_literals/index.md | ---
title: Template literals (Template strings)
slug: Web/JavaScript/Reference/Template_literals
page-type: javascript-language-feature
browser-compat: javascript.grammar.template_literals
---
{{jsSidebar("More")}}
**Template literals** are literals delimited with backtick (`` ` ``) characters, allowing for [multi-li... | 0 |
data/mdn-content/files/en-us/web/javascript/reference | data/mdn-content/files/en-us/web/javascript/reference/global_objects/index.md | ---
title: Standard built-in objects
slug: Web/JavaScript/Reference/Global_Objects
page-type: landing-page
---
{{jsSidebar("Objects")}}
This chapter documents all of JavaScript's standard, built-in objects, including their methods and properties.
The term "global objects" (or standard built-in objects) here is not t... | 0 |
data/mdn-content/files/en-us/web/javascript/reference/global_objects | data/mdn-content/files/en-us/web/javascript/reference/global_objects/evalerror/index.md | ---
title: EvalError
slug: Web/JavaScript/Reference/Global_Objects/EvalError
page-type: javascript-class
browser-compat: javascript.builtins.EvalError
---
{{JSRef}}
The **`EvalError`** object indicates an error regarding the global {{jsxref("Global_Objects/eval", "eval()")}} function. This exception is not thrown by ... | 0 |
data/mdn-content/files/en-us/web/javascript/reference/global_objects/evalerror | data/mdn-content/files/en-us/web/javascript/reference/global_objects/evalerror/evalerror/index.md | ---
title: EvalError() constructor
slug: Web/JavaScript/Reference/Global_Objects/EvalError/EvalError
page-type: javascript-constructor
browser-compat: javascript.builtins.EvalError.EvalError
---
{{JSRef}}
The **`EvalError()`** constructor creates {{jsxref("EvalError")}} objects.
## Syntax
```js-nolint
new EvalError... | 0 |
data/mdn-content/files/en-us/web/javascript/reference/global_objects | data/mdn-content/files/en-us/web/javascript/reference/global_objects/uint8array/index.md | ---
title: Uint8Array
slug: Web/JavaScript/Reference/Global_Objects/Uint8Array
page-type: javascript-class
browser-compat: javascript.builtins.Uint8Array
---
{{JSRef}}
The **`Uint8Array`** typed array represents an array of 8-bit unsigned integers. The contents are initialized to `0`. Once established, you can refere... | 0 |
data/mdn-content/files/en-us/web/javascript/reference/global_objects/uint8array | data/mdn-content/files/en-us/web/javascript/reference/global_objects/uint8array/uint8array/index.md | ---
title: Uint8Array() constructor
slug: Web/JavaScript/Reference/Global_Objects/Uint8Array/Uint8Array
page-type: javascript-constructor
browser-compat: javascript.builtins.Uint8Array.Uint8Array
---
{{JSRef}}
The **`Uint8Array()`** constructor creates {{jsxref("Uint8Array")}} objects. The contents are initialized to... | 0 |
data/mdn-content/files/en-us/web/javascript/reference/global_objects | data/mdn-content/files/en-us/web/javascript/reference/global_objects/json/index.md | ---
title: JSON
slug: Web/JavaScript/Reference/Global_Objects/JSON
page-type: javascript-namespace
browser-compat: javascript.builtins.JSON
---
{{JSRef}}
The **`JSON`** namespace object contains static methods for parsing values from and converting values to [JavaScript Object Notation](https://json.org/) ({{Glossary... | 0 |
data/mdn-content/files/en-us/web/javascript/reference/global_objects/json | data/mdn-content/files/en-us/web/javascript/reference/global_objects/json/parse/index.md | ---
title: JSON.parse()
slug: Web/JavaScript/Reference/Global_Objects/JSON/parse
page-type: javascript-static-method
browser-compat: javascript.builtins.JSON.parse
---
{{JSRef}}
The **`JSON.parse()`** static method parses a JSON string, constructing the JavaScript value or object described by the string. An optional ... | 0 |
data/mdn-content/files/en-us/web/javascript/reference/global_objects/json | data/mdn-content/files/en-us/web/javascript/reference/global_objects/json/stringify/index.md | ---
title: JSON.stringify()
slug: Web/JavaScript/Reference/Global_Objects/JSON/stringify
page-type: javascript-static-method
browser-compat: javascript.builtins.JSON.stringify
---
{{JSRef}}
The **`JSON.stringify()`** static method converts a JavaScript value to a JSON string, optionally replacing values if a replacer... | 0 |
data/mdn-content/files/en-us/web/javascript/reference/global_objects | data/mdn-content/files/en-us/web/javascript/reference/global_objects/undefined/index.md | ---
title: undefined
slug: Web/JavaScript/Reference/Global_Objects/undefined
page-type: javascript-global-property
browser-compat: javascript.builtins.undefined
---
{{jsSidebar("Objects")}}
The **`undefined`** global property represents the primitive
value [`undefined`](/en-US/docs/Web/JavaScript/Data_structures#unde... | 0 |
data/mdn-content/files/en-us/web/javascript/reference/global_objects | data/mdn-content/files/en-us/web/javascript/reference/global_objects/weakset/index.md | ---
title: WeakSet
slug: Web/JavaScript/Reference/Global_Objects/WeakSet
page-type: javascript-class
browser-compat: javascript.builtins.WeakSet
---
{{JSRef}}
A **`WeakSet`** is a collection of garbage-collectable values, including objects and [non-registered symbols](/en-US/docs/Web/JavaScript/Reference/Global_Objec... | 0 |
data/mdn-content/files/en-us/web/javascript/reference/global_objects/weakset | data/mdn-content/files/en-us/web/javascript/reference/global_objects/weakset/weakset/index.md | ---
title: WeakSet() constructor
slug: Web/JavaScript/Reference/Global_Objects/WeakSet/WeakSet
page-type: javascript-constructor
browser-compat: javascript.builtins.WeakSet.WeakSet
---
{{JSRef}}
The **`WeakSet()`** constructor creates {{jsxref("WeakSet")}} objects.
## Syntax
```js-nolint
new WeakSet()
new WeakSet(i... | 0 |
data/mdn-content/files/en-us/web/javascript/reference/global_objects/weakset | data/mdn-content/files/en-us/web/javascript/reference/global_objects/weakset/add/index.md | ---
title: WeakSet.prototype.add()
slug: Web/JavaScript/Reference/Global_Objects/WeakSet/add
page-type: javascript-instance-method
browser-compat: javascript.builtins.WeakSet.add
---
{{JSRef}}
The **`add()`** method of {{jsxref("WeakSet")}} instances appends a new object to the end of this `WeakSet`.
{{EmbedInteract... | 0 |
data/mdn-content/files/en-us/web/javascript/reference/global_objects/weakset | data/mdn-content/files/en-us/web/javascript/reference/global_objects/weakset/has/index.md | ---
title: WeakSet.prototype.has()
slug: Web/JavaScript/Reference/Global_Objects/WeakSet/has
page-type: javascript-instance-method
browser-compat: javascript.builtins.WeakSet.has
---
{{JSRef}}
The **`has()`** method of {{jsxref("WeakSet")}} instances returns a boolean indicating whether an
object exists in this `Weak... | 0 |
data/mdn-content/files/en-us/web/javascript/reference/global_objects/weakset | data/mdn-content/files/en-us/web/javascript/reference/global_objects/weakset/delete/index.md | ---
title: WeakSet.prototype.delete()
slug: Web/JavaScript/Reference/Global_Objects/WeakSet/delete
page-type: javascript-instance-method
browser-compat: javascript.builtins.WeakSet.delete
---
{{JSRef}}
The **`delete()`** method of {{jsxref("WeakSet")}} instances removes the specified element from this `WeakSet`.
{{E... | 0 |
data/mdn-content/files/en-us/web/javascript/reference/global_objects | data/mdn-content/files/en-us/web/javascript/reference/global_objects/decodeuricomponent/index.md | ---
title: decodeURIComponent()
slug: Web/JavaScript/Reference/Global_Objects/decodeURIComponent
page-type: javascript-function
browser-compat: javascript.builtins.decodeURIComponent
---
{{jsSidebar("Objects")}}
The **`decodeURIComponent()`** function decodes a Uniform Resource Identifier (URI) component previously c... | 0 |
data/mdn-content/files/en-us/web/javascript/reference/global_objects | data/mdn-content/files/en-us/web/javascript/reference/global_objects/map/index.md | ---
title: Map
slug: Web/JavaScript/Reference/Global_Objects/Map
page-type: javascript-class
browser-compat: javascript.builtins.Map
---
{{JSRef}}
The **`Map`** object holds key-value pairs and remembers the original insertion order of the keys.
Any value (both objects and {{Glossary("Primitive", "primitive values")}... | 0 |
data/mdn-content/files/en-us/web/javascript/reference/global_objects/map | data/mdn-content/files/en-us/web/javascript/reference/global_objects/map/map/index.md | ---
title: Map() constructor
slug: Web/JavaScript/Reference/Global_Objects/Map/Map
page-type: javascript-constructor
browser-compat: javascript.builtins.Map.Map
---
{{JSRef}}
The **`Map()`** constructor creates {{jsxref("Map")}} objects.
## Syntax
```js-nolint
new Map()
new Map(iterable)
```
> **Note:** `Map()` ca... | 0 |
data/mdn-content/files/en-us/web/javascript/reference/global_objects/map | data/mdn-content/files/en-us/web/javascript/reference/global_objects/map/groupby/index.md | ---
title: Map.groupBy()
slug: Web/JavaScript/Reference/Global_Objects/Map/groupBy
page-type: javascript-static-method
browser-compat: javascript.builtins.Map.groupBy
---
{{JSRef}}
> **Note:** In some versions of some browsers, this method was implemented as the method `Array.prototype.groupToMap()`. Due to web compa... | 0 |
data/mdn-content/files/en-us/web/javascript/reference/global_objects/map | data/mdn-content/files/en-us/web/javascript/reference/global_objects/map/get/index.md | ---
title: Map.prototype.get()
slug: Web/JavaScript/Reference/Global_Objects/Map/get
page-type: javascript-instance-method
browser-compat: javascript.builtins.Map.get
---
{{JSRef}}
The **`get()`** method of {{jsxref("Map")}} instances returns a specified element from this map. If the
value that is associated to the p... | 0 |
data/mdn-content/files/en-us/web/javascript/reference/global_objects/map | data/mdn-content/files/en-us/web/javascript/reference/global_objects/map/has/index.md | ---
title: Map.prototype.has()
slug: Web/JavaScript/Reference/Global_Objects/Map/has
page-type: javascript-instance-method
browser-compat: javascript.builtins.Map.has
---
{{JSRef}}
The **`has()`** method of {{jsxref("Map")}} instances returns a boolean indicating whether an element with the
specified key exists in th... | 0 |
data/mdn-content/files/en-us/web/javascript/reference/global_objects/map | data/mdn-content/files/en-us/web/javascript/reference/global_objects/map/set/index.md | ---
title: Map.prototype.set()
slug: Web/JavaScript/Reference/Global_Objects/Map/set
page-type: javascript-instance-method
browser-compat: javascript.builtins.Map.set
---
{{JSRef}}
The **`set()`** method of {{jsxref("Map")}} instances adds or updates an entry in this map with a specified key and a value.
{{EmbedInte... | 0 |
data/mdn-content/files/en-us/web/javascript/reference/global_objects/map | data/mdn-content/files/en-us/web/javascript/reference/global_objects/map/keys/index.md | ---
title: Map.prototype.keys()
slug: Web/JavaScript/Reference/Global_Objects/Map/keys
page-type: javascript-instance-method
browser-compat: javascript.builtins.Map.keys
---
{{JSRef}}
The **`keys()`** method of {{jsxref("Map")}} instances returns a new _[map iterator](/en-US/docs/Web/JavaScript/Reference/Global_Objec... | 0 |
data/mdn-content/files/en-us/web/javascript/reference/global_objects/map | data/mdn-content/files/en-us/web/javascript/reference/global_objects/map/clear/index.md | ---
title: Map.prototype.clear()
slug: Web/JavaScript/Reference/Global_Objects/Map/clear
page-type: javascript-instance-method
browser-compat: javascript.builtins.Map.clear
---
{{JSRef}}
The **`clear()`** method of {{jsxref("Map")}} instances removes all elements from this map.
{{EmbedInteractiveExample("pages/js/ma... | 0 |
data/mdn-content/files/en-us/web/javascript/reference/global_objects/map | data/mdn-content/files/en-us/web/javascript/reference/global_objects/map/size/index.md | ---
title: Map.prototype.size
slug: Web/JavaScript/Reference/Global_Objects/Map/size
page-type: javascript-instance-accessor-property
browser-compat: javascript.builtins.Map.size
---
{{JSRef}}
The **`size`** accessor property of {{jsxref("Map")}} instances returns the number of elements in this map.
{{EmbedInteracti... | 0 |
data/mdn-content/files/en-us/web/javascript/reference/global_objects/map | data/mdn-content/files/en-us/web/javascript/reference/global_objects/map/values/index.md | ---
title: Map.prototype.values()
slug: Web/JavaScript/Reference/Global_Objects/Map/values
page-type: javascript-instance-method
browser-compat: javascript.builtins.Map.values
---
{{JSRef}}
The **`values()`** method of {{jsxref("Map")}} instances returns a new _[map iterator](/en-US/docs/Web/JavaScript/Reference/Glob... | 0 |
data/mdn-content/files/en-us/web/javascript/reference/global_objects/map | data/mdn-content/files/en-us/web/javascript/reference/global_objects/map/@@iterator/index.md | ---
title: Map.prototype[@@iterator]()
slug: Web/JavaScript/Reference/Global_Objects/Map/@@iterator
page-type: javascript-instance-method
browser-compat: javascript.builtins.Map.@@iterator
---
{{JSRef}}
The **`[@@iterator]()`** method of {{jsxref("Map")}} instances implements the [iterable protocol](/en-US/docs/Web/J... | 0 |
data/mdn-content/files/en-us/web/javascript/reference/global_objects/map | data/mdn-content/files/en-us/web/javascript/reference/global_objects/map/delete/index.md | ---
title: Map.prototype.delete()
slug: Web/JavaScript/Reference/Global_Objects/Map/delete
page-type: javascript-instance-method
browser-compat: javascript.builtins.Map.delete
---
{{JSRef}}
The **`delete()`** method of {{jsxref("Map")}} instances removes the specified element from this map by
key.
{{EmbedInteractive... | 0 |
data/mdn-content/files/en-us/web/javascript/reference/global_objects/map | data/mdn-content/files/en-us/web/javascript/reference/global_objects/map/foreach/index.md | ---
title: Map.prototype.forEach()
slug: Web/JavaScript/Reference/Global_Objects/Map/forEach
page-type: javascript-instance-method
browser-compat: javascript.builtins.Map.forEach
---
{{JSRef}}
The **`forEach()`** method of {{jsxref("Map")}} instances executes a provided function once per each key/value
pair in this m... | 0 |
data/mdn-content/files/en-us/web/javascript/reference/global_objects/map | data/mdn-content/files/en-us/web/javascript/reference/global_objects/map/@@species/index.md | ---
title: Map[@@species]
slug: Web/JavaScript/Reference/Global_Objects/Map/@@species
page-type: javascript-static-accessor-property
browser-compat: javascript.builtins.Map.@@species
---
{{JSRef}}
The **`Map[@@species]`** static accessor property is an unused accessor property specifying how to copy `Map` objects.
#... | 0 |
data/mdn-content/files/en-us/web/javascript/reference/global_objects/map | data/mdn-content/files/en-us/web/javascript/reference/global_objects/map/entries/index.md | ---
title: Map.prototype.entries()
slug: Web/JavaScript/Reference/Global_Objects/Map/entries
page-type: javascript-instance-method
browser-compat: javascript.builtins.Map.entries
---
{{JSRef}}
The **`entries()`** method of {{jsxref("Map")}} instances returns a new _[map iterator](/en-US/docs/Web/JavaScript/Reference/... | 0 |
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