repo_id stringlengths 22 103 | file_path stringlengths 41 147 | content stringlengths 181 193k | __index_level_0__ int64 0 0 |
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data/mdn-content/files/en-us/web/html | data/mdn-content/files/en-us/web/html/microdata/index.md | ---
title: Microdata
slug: Web/HTML/Microdata
page-type: guide
---
{{HTMLSidebar}}
Microdata is part of the {{glossary("WHATWG")}} HTML Standard and is used to nest metadata within existing content on web pages. Search engines and web crawlers can extract and process microdata from a web page and use it to provide a ... | 0 |
data/mdn-content/files/en-us/web/html | data/mdn-content/files/en-us/web/html/cors_enabled_image/index.md | ---
title: Allowing cross-origin use of images and canvas
slug: Web/HTML/CORS_enabled_image
page-type: guide
---
{{HTMLSidebar}}
HTML provides a [`crossorigin`](/en-US/docs/Web/HTML/Element/img#crossorigin) attribute for images that, in combination with an appropriate {{Glossary("CORS")}} header, allows images define... | 0 |
data/mdn-content/files/en-us/web | data/mdn-content/files/en-us/web/opensearch/index.md | ---
title: OpenSearch description format
slug: Web/OpenSearch
page-type: guide
---
{{AddonSidebar}}
The **[OpenSearch description format](https://github.com/dewitt/opensearch)** can be used to describe the web interface of a search engine. This allows a website to describe a search engine for itself, so that a browse... | 0 |
data/mdn-content/files/en-us/web | data/mdn-content/files/en-us/web/javascript/index.md | ---
title: JavaScript
slug: Web/JavaScript
page-type: landing-page
---
{{jsSidebar}}
**JavaScript** (**JS**) is a lightweight interpreted (or [just-in-time](https://en.wikipedia.org/wiki/Just-in-time_compilation) compiled) programming language with {{Glossary("First-class Function", "first-class functions")}}. While ... | 0 |
data/mdn-content/files/en-us/web/javascript | data/mdn-content/files/en-us/web/javascript/equality_comparisons_and_sameness/index.md | ---
title: Equality comparisons and sameness
slug: Web/JavaScript/Equality_comparisons_and_sameness
page-type: guide
---
{{jsSidebar("Intermediate")}}
JavaScript provides three different value-comparison operations:
- [`===`](/en-US/docs/Web/JavaScript/Reference/Operators/Strict_equality) β strict equality (triple e... | 0 |
data/mdn-content/files/en-us/web/javascript | data/mdn-content/files/en-us/web/javascript/event_loop/the_javascript_runtime_environment_example.svg | <svg xmlns="http://www.w3.org/2000/svg" width="294.708" height="271.079" viewBox="0 0 77.975 71.723"><g style="visibility:visible" class="com.sun.star.drawing.CustomShape"><path style="fill:#cfe7f5;stroke:none" d="M5550 11500H1200V3500h8700v8000z" transform="translate(-10.576 -31.118) scale(.00893)"/><path style="fill:... | 0 |
data/mdn-content/files/en-us/web/javascript | data/mdn-content/files/en-us/web/javascript/event_loop/index.md | ---
title: The event loop
slug: Web/JavaScript/Event_loop
page-type: guide
---
{{jsSidebar("Advanced")}}
JavaScript has a runtime model based on an **event loop**, which is responsible for executing the code, collecting and processing events, and executing queued sub-tasks. This model is quite different from models i... | 0 |
data/mdn-content/files/en-us/web/javascript | data/mdn-content/files/en-us/web/javascript/data_structures/index.md | ---
title: JavaScript data types and data structures
slug: Web/JavaScript/Data_structures
page-type: guide
---
{{jsSidebar("More")}}
Programming languages all have built-in data structures, but these often differ from one language to another. This article attempts to list the built-in data structures available in Jav... | 0 |
data/mdn-content/files/en-us/web/javascript | data/mdn-content/files/en-us/web/javascript/closures/index.md | ---
title: Closures
slug: Web/JavaScript/Closures
page-type: guide
---
{{jsSidebar("Intermediate")}}
A **closure** is the combination of a function bundled together (enclosed) with references to its surrounding state (the **lexical environment**). In other words, a closure gives you access to an outer function's scop... | 0 |
data/mdn-content/files/en-us/web/javascript | data/mdn-content/files/en-us/web/javascript/javascript_technologies_overview/index.md | ---
title: JavaScript technologies overview
slug: Web/JavaScript/JavaScript_technologies_overview
page-type: guide
---
{{jsSidebar("Introductory")}}
Whereas [HTML](/en-US/docs/Web/HTML) defines a webpage's structure and content and [CSS](/en-US/docs/Web/CSS) sets the formatting and appearance, [JavaScript](/en-US/doc... | 0 |
data/mdn-content/files/en-us/web/javascript | data/mdn-content/files/en-us/web/javascript/inheritance_and_the_prototype_chain/index.md | ---
title: Inheritance and the prototype chain
slug: Web/JavaScript/Inheritance_and_the_prototype_chain
page-type: guide
---
{{jsSidebar("Advanced")}}
In programming, _inheritance_ refers to passing down characteristics from a parent to a child so that a new piece of code can reuse and build upon the features of an e... | 0 |
data/mdn-content/files/en-us/web/javascript | data/mdn-content/files/en-us/web/javascript/enumerability_and_ownership_of_properties/index.md | ---
title: Enumerability and ownership of properties
slug: Web/JavaScript/Enumerability_and_ownership_of_properties
page-type: guide
---
{{jsSidebar("More")}}
Every property in JavaScript objects can be classified by three factors:
- Enumerable or non-enumerable;
- String or [symbol](/en-US/docs/Web/JavaScript/Refer... | 0 |
data/mdn-content/files/en-us/web/javascript | data/mdn-content/files/en-us/web/javascript/memory_management/index.md | ---
title: Memory management
slug: Web/JavaScript/Memory_management
page-type: guide
---
{{jsSidebar("Advanced")}}
Low-level languages like C, have manual memory management primitives such as [`malloc()`](https://pubs.opengroup.org/onlinepubs/009695399/functions/malloc.html) and [`free()`](https://en.wikipedia.org/wi... | 0 |
data/mdn-content/files/en-us/web/javascript | data/mdn-content/files/en-us/web/javascript/language_overview/index.md | ---
title: JavaScript language overview
slug: Web/JavaScript/Language_overview
page-type: guide
---
{{jsSidebar}}
JavaScript is a multi-paradigm, dynamic language with types and operators, standard built-in objects, and methods. Its syntax is based on the Java and C languages β many structures from those languages ap... | 0 |
data/mdn-content/files/en-us/web/javascript | data/mdn-content/files/en-us/web/javascript/guide/index.md | ---
title: JavaScript Guide
slug: Web/JavaScript/Guide
page-type: guide
---
{{jsSidebar("JavaScript Guide")}}
The JavaScript Guide shows you how to use [JavaScript](/en-US/docs/Web/JavaScript) and gives an overview of the language. If you need exhaustive information about a language feature, have a look at the [JavaS... | 0 |
data/mdn-content/files/en-us/web/javascript/guide | data/mdn-content/files/en-us/web/javascript/guide/loops_and_iteration/index.md | ---
title: Loops and iteration
slug: Web/JavaScript/Guide/Loops_and_iteration
page-type: guide
---
{{jsSidebar("JavaScript Guide")}}
{{PreviousNext("Web/JavaScript/Guide/Control_flow_and_error_handling", "Web/JavaScript/Guide/Functions")}}
Loops offer a quick and easy way to do something repeatedly. This
chapter of t... | 0 |
data/mdn-content/files/en-us/web/javascript/guide | data/mdn-content/files/en-us/web/javascript/guide/working_with_objects/index.md | ---
title: Working with objects
slug: Web/JavaScript/Guide/Working_with_objects
page-type: guide
---
{{jsSidebar("JavaScript Guide")}} {{PreviousNext("Web/JavaScript/Guide/Keyed_collections", "Web/JavaScript/Guide/Using_classes")}}
JavaScript is designed on a simple object-based paradigm. An object is a collection of... | 0 |
data/mdn-content/files/en-us/web/javascript/guide | data/mdn-content/files/en-us/web/javascript/guide/expressions_and_operators/index.md | ---
title: Expressions and operators
slug: Web/JavaScript/Guide/Expressions_and_operators
page-type: guide
---
{{jsSidebar("JavaScript Guide")}} {{PreviousNext("Web/JavaScript/Guide/Functions", "Web/JavaScript/Guide/Numbers_and_dates")}}
This chapter describes JavaScript's expressions and operators, including assignm... | 0 |
data/mdn-content/files/en-us/web/javascript/guide | data/mdn-content/files/en-us/web/javascript/guide/iterators_and_generators/index.md | ---
title: Iterators and generators
slug: Web/JavaScript/Guide/Iterators_and_generators
page-type: guide
---
{{jsSidebar("JavaScript Guide")}} {{PreviousNext("Web/JavaScript/Guide/Typed_arrays", "Web/JavaScript/Guide/Meta_programming")}}
Iterators and Generators bring the concept of iteration directly into the core l... | 0 |
data/mdn-content/files/en-us/web/javascript/guide | data/mdn-content/files/en-us/web/javascript/guide/using_promises/index.md | ---
title: Using promises
slug: Web/JavaScript/Guide/Using_promises
page-type: guide
---
{{jsSidebar("JavaScript Guide")}}{{PreviousNext("Web/JavaScript/Guide/Using_classes", "Web/JavaScript/Guide/Typed_arrays")}}
A {{jsxref("Promise")}} is an object representing the eventual completion or failure of an asynchronous ... | 0 |
data/mdn-content/files/en-us/web/javascript/guide | data/mdn-content/files/en-us/web/javascript/guide/text_formatting/index.md | ---
title: Text formatting
slug: Web/JavaScript/Guide/Text_formatting
page-type: guide
---
{{jsSidebar("JavaScript Guide")}} {{PreviousNext("Web/JavaScript/Guide/Numbers_and_dates", "Web/JavaScript/Guide/Regular_expressions")}}
This chapter introduces how to work with strings and text in JavaScript.
## Strings
Java... | 0 |
data/mdn-content/files/en-us/web/javascript/guide | data/mdn-content/files/en-us/web/javascript/guide/modules/index.md | ---
title: JavaScript modules
slug: Web/JavaScript/Guide/Modules
page-type: guide
browser-compat:
- javascript.statements.import
- javascript.statements.export
---
{{jsSidebar("JavaScript Guide")}}{{Previous("Web/JavaScript/Guide/Meta_programming")}}
This guide gives you all you need to get started with JavaScrip... | 0 |
data/mdn-content/files/en-us/web/javascript/guide | data/mdn-content/files/en-us/web/javascript/guide/control_flow_and_error_handling/index.md | ---
title: Control flow and error handling
slug: Web/JavaScript/Guide/Control_flow_and_error_handling
page-type: guide
---
{{jsSidebar("JavaScript Guide")}}
{{PreviousNext("Web/JavaScript/Guide/Grammar_and_types", "Web/JavaScript/Guide/Loops_and_iteration")}}
JavaScript supports a compact set of statements, specifica... | 0 |
data/mdn-content/files/en-us/web/javascript/guide | data/mdn-content/files/en-us/web/javascript/guide/indexed_collections/index.md | ---
title: Indexed collections
slug: Web/JavaScript/Guide/Indexed_collections
page-type: guide
---
{{jsSidebar("JavaScript Guide")}} {{PreviousNext("Web/JavaScript/Guide/Regular_expressions", "Web/JavaScript/Guide/Keyed_collections")}}
This chapter introduces collections of data which are ordered by an index value. T... | 0 |
data/mdn-content/files/en-us/web/javascript/guide | data/mdn-content/files/en-us/web/javascript/guide/using_classes/index.md | ---
title: Using classes
slug: Web/JavaScript/Guide/Using_classes
page-type: guide
---
{{jsSidebar("JavaScript Guide")}} {{PreviousNext("Web/JavaScript/Guide/Working_with_objects", "Web/JavaScript/Guide/Using_promises")}}
JavaScript is a prototype-based language β an object's behaviors are specified by its own proper... | 0 |
data/mdn-content/files/en-us/web/javascript/guide | data/mdn-content/files/en-us/web/javascript/guide/regular_expressions/index.md | ---
title: Regular expressions
slug: Web/JavaScript/Guide/Regular_expressions
page-type: guide
---
{{jsSidebar("JavaScript Guide")}} {{PreviousNext("Web/JavaScript/Guide/Text_formatting", "Web/JavaScript/Guide/Indexed_collections")}}
Regular expressions are patterns used to match character combinations in strings.
In... | 0 |
data/mdn-content/files/en-us/web/javascript/guide/regular_expressions | data/mdn-content/files/en-us/web/javascript/guide/regular_expressions/character_classes/index.md | ---
title: Character classes
slug: Web/JavaScript/Guide/Regular_expressions/Character_classes
page-type: guide
---
{{jsSidebar("JavaScript Guide")}}
Character classes distinguish kinds of characters such as, for example, distinguishing between letters and digits.
{{EmbedInteractiveExample("pages/js/regexp-character-... | 0 |
data/mdn-content/files/en-us/web/javascript/guide/regular_expressions | data/mdn-content/files/en-us/web/javascript/guide/regular_expressions/cheatsheet/index.md | ---
title: Regular expression syntax cheat sheet
slug: Web/JavaScript/Guide/Regular_expressions/Cheatsheet
page-type: guide
---
{{jsSidebar("JavaScript Guide")}}
This page provides an overall cheat sheet of all the capabilities of `RegExp` syntax by aggregating the content of the articles in the `RegExp` guide. If yo... | 0 |
data/mdn-content/files/en-us/web/javascript/guide/regular_expressions | data/mdn-content/files/en-us/web/javascript/guide/regular_expressions/groups_and_backreferences/index.md | ---
title: Groups and backreferences
slug: Web/JavaScript/Guide/Regular_expressions/Groups_and_backreferences
page-type: guide
---
{{jsSidebar("JavaScript Guide")}}
Groups group multiple patterns as a whole, and capturing groups provide extra submatch information when using a regular expression pattern to match again... | 0 |
data/mdn-content/files/en-us/web/javascript/guide/regular_expressions | data/mdn-content/files/en-us/web/javascript/guide/regular_expressions/assertions/index.md | ---
title: Assertions
slug: Web/JavaScript/Guide/Regular_expressions/Assertions
page-type: guide
---
{{jsSidebar("JavaScript Guide")}}
Assertions include boundaries, which indicate the beginnings and endings of lines and words, and other patterns indicating in some way that a match is possible (including look-ahead, ... | 0 |
data/mdn-content/files/en-us/web/javascript/guide/regular_expressions | data/mdn-content/files/en-us/web/javascript/guide/regular_expressions/quantifiers/index.md | ---
title: Quantifiers
slug: Web/JavaScript/Guide/Regular_expressions/Quantifiers
page-type: guide
---
{{jsSidebar("JavaScript Guide")}}
Quantifiers indicate numbers of characters or expressions to match.
{{EmbedInteractiveExample("pages/js/regexp-quantifiers.html", "taller")}}
## Types
> **Note:** In the followin... | 0 |
data/mdn-content/files/en-us/web/javascript/guide | data/mdn-content/files/en-us/web/javascript/guide/functions/index.md | ---
title: Functions
slug: Web/JavaScript/Guide/Functions
page-type: guide
---
{{jsSidebar("JavaScript Guide")}} {{PreviousNext("Web/JavaScript/Guide/Loops_and_iteration", "Web/JavaScript/Guide/Expressions_and_operators")}}
Functions are one of the fundamental building blocks in JavaScript. A function in JavaScript i... | 0 |
data/mdn-content/files/en-us/web/javascript/guide | data/mdn-content/files/en-us/web/javascript/guide/numbers_and_dates/index.md | ---
title: Numbers and dates
slug: Web/JavaScript/Guide/Numbers_and_dates
page-type: guide
---
{{jsSidebar("JavaScript Guide")}} {{PreviousNext("Web/JavaScript/Guide/Expressions_and_operators", "Web/JavaScript/Guide/Text_formatting")}}
This chapter introduces the concepts, objects and functions used to work with and ... | 0 |
data/mdn-content/files/en-us/web/javascript/guide | data/mdn-content/files/en-us/web/javascript/guide/typed_arrays/index.md | ---
title: JavaScript typed arrays
slug: Web/JavaScript/Guide/Typed_arrays
page-type: guide
---
{{jsSidebar("JavaScript Guide")}} {{PreviousNext("Web/JavaScript/Guide/Using_promises", "Web/JavaScript/Guide/Iterators_and_generators")}}
JavaScript typed arrays are array-like objects that provide a mechanism for reading... | 0 |
data/mdn-content/files/en-us/web/javascript/guide | data/mdn-content/files/en-us/web/javascript/guide/meta_programming/index.md | ---
title: Meta programming
slug: Web/JavaScript/Guide/Meta_programming
page-type: guide
---
{{jsSidebar("JavaScript Guide")}}{{PreviousNext("Web/JavaScript/Guide/Iterators_and_generators", "Web/JavaScript/Guide/Modules")}}
The {{jsxref("Proxy")}} and {{jsxref("Reflect")}} objects allow you to intercept and define cu... | 0 |
data/mdn-content/files/en-us/web/javascript/guide | data/mdn-content/files/en-us/web/javascript/guide/grammar_and_types/index.md | ---
title: Grammar and types
slug: Web/JavaScript/Guide/Grammar_and_types
page-type: guide
---
{{jsSidebar("JavaScript Guide")}} {{PreviousNext("Web/JavaScript/Guide/Introduction", "Web/JavaScript/Guide/Control_flow_and_error_handling")}}
This chapter discusses JavaScript's basic grammar, variable declarations, data ... | 0 |
data/mdn-content/files/en-us/web/javascript/guide | data/mdn-content/files/en-us/web/javascript/guide/introduction/index.md | ---
title: Introduction
slug: Web/JavaScript/Guide/Introduction
page-type: guide
---
{{jsSidebar("JavaScript Guide")}} {{PreviousNext("Web/JavaScript/Guide", "Web/JavaScript/Guide/Grammar_and_types")}}
This chapter introduces JavaScript and discusses some of its fundamental concepts.
## What you should already know
... | 0 |
data/mdn-content/files/en-us/web/javascript/guide | data/mdn-content/files/en-us/web/javascript/guide/keyed_collections/index.md | ---
title: Keyed collections
slug: Web/JavaScript/Guide/Keyed_collections
page-type: guide
---
{{jsSidebar("JavaScript Guide")}} {{PreviousNext("Web/JavaScript/Guide/Indexed_collections", "Web/JavaScript/Guide/Working_with_objects")}}
This chapter introduces collections of data which are indexed by a key; `Map` and `... | 0 |
data/mdn-content/files/en-us/web/javascript | data/mdn-content/files/en-us/web/javascript/reference/index.md | ---
title: JavaScript reference
slug: Web/JavaScript/Reference
page-type: landing-page
---
{{jsSidebar}}
The JavaScript reference serves as a repository of facts about the JavaScript language. The entire language is described here in detail. As you write JavaScript code, you'll refer to these pages often (thus the ti... | 0 |
data/mdn-content/files/en-us/web/javascript/reference | data/mdn-content/files/en-us/web/javascript/reference/trailing_commas/index.md | ---
title: Trailing commas
slug: Web/JavaScript/Reference/Trailing_commas
page-type: javascript-language-feature
browser-compat: javascript.grammar.trailing_commas
---
{{jsSidebar("More")}}
**Trailing commas** (sometimes called "final commas") can be useful when adding new elements, parameters, or properties to JavaS... | 0 |
data/mdn-content/files/en-us/web/javascript/reference | data/mdn-content/files/en-us/web/javascript/reference/strict_mode/index.md | ---
title: Strict mode
slug: Web/JavaScript/Reference/Strict_mode
page-type: guide
spec-urls: https://tc39.es/ecma262/multipage/strict-mode-of-ecmascript.html
---
{{jsSidebar("More")}}
> **Note:** Sometimes you'll see the default, non-strict mode referred to as _[sloppy mode](/en-US/docs/Glossary/Sloppy_mode)_. This ... | 0 |
data/mdn-content/files/en-us/web/javascript/reference | data/mdn-content/files/en-us/web/javascript/reference/classes/index.md | ---
title: Classes
slug: Web/JavaScript/Reference/Classes
page-type: guide
browser-compat: javascript.classes
---
{{jsSidebar("Classes")}}
Classes are a template for creating objects. They encapsulate data with code to work on that data. Classes in JS are built on [prototypes](/en-US/docs/Web/JavaScript/Inheritance_a... | 0 |
data/mdn-content/files/en-us/web/javascript/reference/classes | data/mdn-content/files/en-us/web/javascript/reference/classes/public_class_fields/index.md | ---
title: Public class fields
slug: Web/JavaScript/Reference/Classes/Public_class_fields
page-type: javascript-language-feature
browser-compat: javascript.classes.public_class_fields
---
{{jsSidebar("Classes")}}
**Public fields** are writable, enumerable, and configurable properties. As such, unlike their private co... | 0 |
data/mdn-content/files/en-us/web/javascript/reference/classes | data/mdn-content/files/en-us/web/javascript/reference/classes/static_initialization_blocks/index.md | ---
title: Static initialization blocks
slug: Web/JavaScript/Reference/Classes/Static_initialization_blocks
page-type: javascript-language-feature
browser-compat: javascript.classes.static_initialization_blocks
---
{{jsSidebar("Classes")}}
**Static initialization blocks** are declared within a {{jsxref("Statements/cl... | 0 |
data/mdn-content/files/en-us/web/javascript/reference/classes | data/mdn-content/files/en-us/web/javascript/reference/classes/extends/index.md | ---
title: extends
slug: Web/JavaScript/Reference/Classes/extends
page-type: javascript-language-feature
browser-compat: javascript.classes.extends
---
{{jsSidebar("Classes")}}
The **`extends`** keyword is used in [class declarations](/en-US/docs/Web/JavaScript/Reference/Statements/class) or [class expressions](/en-U... | 0 |
data/mdn-content/files/en-us/web/javascript/reference/classes | data/mdn-content/files/en-us/web/javascript/reference/classes/static/index.md | ---
title: static
slug: Web/JavaScript/Reference/Classes/static
page-type: javascript-language-feature
browser-compat: javascript.classes.static
---
{{jsSidebar("Classes")}}
The **`static`** keyword defines a [static method or field](/en-US/docs/Web/JavaScript/Reference/Classes#static_methods_and_fields) for a class,... | 0 |
data/mdn-content/files/en-us/web/javascript/reference/classes | data/mdn-content/files/en-us/web/javascript/reference/classes/constructor/index.md | ---
title: constructor
slug: Web/JavaScript/Reference/Classes/constructor
page-type: javascript-language-feature
browser-compat: javascript.classes.constructor
---
{{jsSidebar("Classes")}}
The **`constructor`** method is a special method of a [class](/en-US/docs/Web/JavaScript/Reference/Classes) for creating and init... | 0 |
data/mdn-content/files/en-us/web/javascript/reference/classes | data/mdn-content/files/en-us/web/javascript/reference/classes/private_properties/index.md | ---
title: Private properties
slug: Web/JavaScript/Reference/Classes/Private_properties
page-type: javascript-language-feature
browser-compat:
- javascript.classes.private_class_fields
- javascript.classes.private_class_fields_in
- javascript.classes.private_class_methods
---
{{jsSidebar("Classes")}}
**Private ... | 0 |
data/mdn-content/files/en-us/web/javascript/reference | data/mdn-content/files/en-us/web/javascript/reference/errors/index.md | ---
title: JavaScript error reference
slug: Web/JavaScript/Reference/Errors
page-type: landing-page
---
{{jsSidebar("Errors")}}
Below, you'll find a list of errors which are thrown by JavaScript. These errors can be a helpful debugging aid, but the reported problem isn't always immediately clear. The pages below will... | 0 |
data/mdn-content/files/en-us/web/javascript/reference/errors | data/mdn-content/files/en-us/web/javascript/reference/errors/unexpected_token/index.md | ---
title: "SyntaxError: Unexpected token"
slug: Web/JavaScript/Reference/Errors/Unexpected_token
page-type: javascript-error
---
{{jsSidebar("Errors")}}
The JavaScript exceptions "unexpected token" occur when a specific language construct
was expected, but something else was provided. This might be a simple typo.
#... | 0 |
data/mdn-content/files/en-us/web/javascript/reference/errors | data/mdn-content/files/en-us/web/javascript/reference/errors/invalid_const_assignment/index.md | ---
title: 'TypeError: invalid assignment to const "x"'
slug: Web/JavaScript/Reference/Errors/Invalid_const_assignment
page-type: javascript-error
---
{{jsSidebar("Errors")}}
The JavaScript exception "invalid assignment to const" occurs when it was attempted to
alter a constant value. JavaScript
[`const`](/en-US/docs... | 0 |
data/mdn-content/files/en-us/web/javascript/reference/errors | data/mdn-content/files/en-us/web/javascript/reference/errors/already_has_pragma/index.md | ---
title: "Warning: -file- is being assigned a //# sourceMappingURL, but already has one"
slug: Web/JavaScript/Reference/Errors/Already_has_pragma
page-type: javascript-error
---
{{jsSidebar("Errors")}}
The JavaScript warning "-file- is being assigned a //# sourceMappingURL, but already has one." occurs when a sourc... | 0 |
data/mdn-content/files/en-us/web/javascript/reference/errors | data/mdn-content/files/en-us/web/javascript/reference/errors/json_bad_parse/index.md | ---
title: "SyntaxError: JSON.parse: bad parsing"
slug: Web/JavaScript/Reference/Errors/JSON_bad_parse
page-type: javascript-error
---
{{jsSidebar("Errors")}}
The JavaScript exceptions thrown by {{jsxref("JSON.parse()")}} occur when string failed
to be parsed as JSON.
## Message
```plain
SyntaxError: JSON.parse: un... | 0 |
data/mdn-content/files/en-us/web/javascript/reference/errors | data/mdn-content/files/en-us/web/javascript/reference/errors/delete_in_strict_mode/index.md | ---
title: "SyntaxError: applying the 'delete' operator to an unqualified name is deprecated"
slug: Web/JavaScript/Reference/Errors/Delete_in_strict_mode
page-type: javascript-error
---
{{jsSidebar("Errors")}}
The JavaScript [strict mode](/en-US/docs/Web/JavaScript/Reference/Strict_mode)-only exception "applying the ... | 0 |
data/mdn-content/files/en-us/web/javascript/reference/errors | data/mdn-content/files/en-us/web/javascript/reference/errors/invalid_for-in_initializer/index.md | ---
title: "SyntaxError: for-in loop head declarations may not have initializers"
slug: Web/JavaScript/Reference/Errors/Invalid_for-in_initializer
page-type: javascript-error
---
{{jsSidebar("Errors")}}
The JavaScript [strict mode](/en-US/docs/Web/JavaScript/Reference/Strict_mode)-only exception
"for-in loop head dec... | 0 |
data/mdn-content/files/en-us/web/javascript/reference/errors | data/mdn-content/files/en-us/web/javascript/reference/errors/in_operator_no_object/index.md | ---
title: "TypeError: cannot use 'in' operator to search for 'x' in 'y'"
slug: Web/JavaScript/Reference/Errors/in_operator_no_object
page-type: javascript-error
---
{{jsSidebar("Errors")}}
The JavaScript exception "right-hand side of 'in' should be an object" occurs when the
[`in` operator](/en-US/docs/Web/JavaScrip... | 0 |
data/mdn-content/files/en-us/web/javascript/reference/errors | data/mdn-content/files/en-us/web/javascript/reference/errors/missing_initializer_in_const/index.md | ---
title: "SyntaxError: missing = in const declaration"
slug: Web/JavaScript/Reference/Errors/Missing_initializer_in_const
page-type: javascript-error
---
{{jsSidebar("Errors")}}
The JavaScript exception "missing = in const declaration" occurs when a const
declaration was not given a value in the same statement (lik... | 0 |
data/mdn-content/files/en-us/web/javascript/reference/errors | data/mdn-content/files/en-us/web/javascript/reference/errors/cant_assign_to_property/index.md | ---
title: 'TypeError: can''t assign to property "x" on "y": not an object'
slug: Web/JavaScript/Reference/Errors/Cant_assign_to_property
page-type: javascript-error
---
{{jsSidebar("Errors")}}
The JavaScript strict mode exception "can't assign to property" occurs when attempting
to create a property on [primitive](/... | 0 |
data/mdn-content/files/en-us/web/javascript/reference/errors | data/mdn-content/files/en-us/web/javascript/reference/errors/called_on_incompatible_type/index.md | ---
title: "TypeError: X.prototype.y called on incompatible type"
slug: Web/JavaScript/Reference/Errors/Called_on_incompatible_type
page-type: javascript-error
---
{{jsSidebar("Errors")}}
The JavaScript exception "called on incompatible target (or object)" occurs when a
function (on a given object), is called with a ... | 0 |
data/mdn-content/files/en-us/web/javascript/reference/errors | data/mdn-content/files/en-us/web/javascript/reference/errors/missing_curly_after_function_body/index.md | ---
title: "SyntaxError: missing } after function body"
slug: Web/JavaScript/Reference/Errors/Missing_curly_after_function_body
page-type: javascript-error
---
{{jsSidebar("Errors")}}
The JavaScript exception "missing } after function body" occurs when there is a syntax
mistake when creating a function somewhere. Che... | 0 |
data/mdn-content/files/en-us/web/javascript/reference/errors | data/mdn-content/files/en-us/web/javascript/reference/errors/getter_only/index.md | ---
title: 'TypeError: setting getter-only property "x"'
slug: Web/JavaScript/Reference/Errors/Getter_only
page-type: javascript-error
---
{{jsSidebar("Errors")}}
The JavaScript [strict mode](/en-US/docs/Web/JavaScript/Reference/Strict_mode)-only exception "setting getter-only property" occurs when there is an attemp... | 0 |
data/mdn-content/files/en-us/web/javascript/reference/errors | data/mdn-content/files/en-us/web/javascript/reference/errors/bad_return/index.md | ---
title: "SyntaxError: return not in function"
slug: Web/JavaScript/Reference/Errors/Bad_return
page-type: javascript-error
---
{{jsSidebar("Errors")}}
The JavaScript exception "return not in function" occurs when a [`return`](/en-US/docs/Web/JavaScript/Reference/Statements/return) statement is called outside of a ... | 0 |
data/mdn-content/files/en-us/web/javascript/reference/errors | data/mdn-content/files/en-us/web/javascript/reference/errors/resulting_string_too_large/index.md | ---
title: "RangeError: repeat count must be less than infinity"
slug: Web/JavaScript/Reference/Errors/Resulting_string_too_large
page-type: javascript-error
---
{{jsSidebar("Errors")}}
The JavaScript exception "repeat count must be less than infinity" occurs when the
{{jsxref("String.prototype.repeat()")}} method is... | 0 |
data/mdn-content/files/en-us/web/javascript/reference/errors | data/mdn-content/files/en-us/web/javascript/reference/errors/cant_define_property_object_not_extensible/index.md | ---
title: 'TypeError: can''t define property "x": "obj" is not extensible'
slug: Web/JavaScript/Reference/Errors/Cant_define_property_object_not_extensible
page-type: javascript-error
---
{{jsSidebar("Errors")}}
The JavaScript exception "can't define property "x": "obj" is not extensible" occurs
when {{jsxref("Objec... | 0 |
data/mdn-content/files/en-us/web/javascript/reference/errors | data/mdn-content/files/en-us/web/javascript/reference/errors/invalid_for-of_initializer/index.md | ---
title: "SyntaxError: a declaration in the head of a for-of loop can't have an initializer"
slug: Web/JavaScript/Reference/Errors/Invalid_for-of_initializer
page-type: javascript-error
---
{{jsSidebar("Errors")}}
The JavaScript exception "a declaration in the head of a for-of loop can't have an initializer" occurs... | 0 |
data/mdn-content/files/en-us/web/javascript/reference/errors | data/mdn-content/files/en-us/web/javascript/reference/errors/cant_use_nullish_coalescing_unparenthesized/index.md | ---
title: "SyntaxError: cannot use `??` unparenthesized within `||` and `&&` expressions"
slug: Web/JavaScript/Reference/Errors/Cant_use_nullish_coalescing_unparenthesized
page-type: javascript-error
---
{{jsSidebar("Errors")}}
The JavaScript exception "cannot use `??` unparenthesized within `||` and `&&` expression... | 0 |
data/mdn-content/files/en-us/web/javascript/reference/errors | data/mdn-content/files/en-us/web/javascript/reference/errors/missing_parenthesis_after_condition/index.md | ---
title: "SyntaxError: missing ) after condition"
slug: Web/JavaScript/Reference/Errors/Missing_parenthesis_after_condition
page-type: javascript-error
---
{{jsSidebar("Errors")}}
The JavaScript exception "missing ) after condition" occurs when there is an error with
how an
[`if`](/en-US/docs/Web/JavaScript/Referen... | 0 |
data/mdn-content/files/en-us/web/javascript/reference/errors | data/mdn-content/files/en-us/web/javascript/reference/errors/invalid_assignment_left-hand_side/index.md | ---
title: "SyntaxError: invalid assignment left-hand side"
slug: Web/JavaScript/Reference/Errors/Invalid_assignment_left-hand_side
page-type: javascript-error
---
{{jsSidebar("Errors")}}
The JavaScript exception "invalid assignment left-hand side" occurs when there was an unexpected assignment somewhere. It may be t... | 0 |
data/mdn-content/files/en-us/web/javascript/reference/errors | data/mdn-content/files/en-us/web/javascript/reference/errors/unexpected_type/index.md | ---
title: 'TypeError: "x" is (not) "y"'
slug: Web/JavaScript/Reference/Errors/Unexpected_type
page-type: javascript-error
---
{{jsSidebar("Errors")}}
The JavaScript exception "_x_ is (not) _y_" occurs when there was an
unexpected type. Oftentimes, unexpected {{jsxref("undefined")}} or [`null`](/en-US/docs/Web/JavaSc... | 0 |
data/mdn-content/files/en-us/web/javascript/reference/errors | data/mdn-content/files/en-us/web/javascript/reference/errors/invalid_right_hand_side_instanceof_operand/index.md | ---
title: "TypeError: invalid 'instanceof' operand 'x'"
slug: Web/JavaScript/Reference/Errors/invalid_right_hand_side_instanceof_operand
page-type: javascript-error
---
{{jsSidebar("Errors")}}
The JavaScript exception "invalid 'instanceof' operand" occurs when the right-hand side
operands of the [`instanceof` operat... | 0 |
data/mdn-content/files/en-us/web/javascript/reference/errors | data/mdn-content/files/en-us/web/javascript/reference/errors/deprecated_source_map_pragma/index.md | ---
title: "SyntaxError: Using //@ to indicate sourceURL pragmas is deprecated. Use //# instead"
slug: Web/JavaScript/Reference/Errors/Deprecated_source_map_pragma
page-type: javascript-error
---
{{jsSidebar("Errors")}}
The JavaScript warning "Using `//@` to indicate sourceURL pragmas is deprecated. Use `//#` instead... | 0 |
data/mdn-content/files/en-us/web/javascript/reference/errors | data/mdn-content/files/en-us/web/javascript/reference/errors/equal_as_assign/index.md | ---
title: "SyntaxError: test for equality (==) mistyped as assignment (=)?"
slug: Web/JavaScript/Reference/Errors/Equal_as_assign
page-type: javascript-error
---
{{jsSidebar("Errors")}}
The JavaScript warning "test for equality (==) mistyped as assignment (=)?" occurs when
there was an assignment (`=`) when you woul... | 0 |
data/mdn-content/files/en-us/web/javascript/reference/errors | data/mdn-content/files/en-us/web/javascript/reference/errors/not_defined/index.md | ---
title: 'ReferenceError: "x" is not defined'
slug: Web/JavaScript/Reference/Errors/Not_defined
page-type: javascript-error
---
{{jsSidebar("Errors")}}
The JavaScript exception "_variable_ is not defined" occurs when there is a
non-existent variable referenced somewhere.
## Message
```plain
ReferenceError: "x" is... | 0 |
data/mdn-content/files/en-us/web/javascript/reference/errors | data/mdn-content/files/en-us/web/javascript/reference/errors/either_be_both_static_or_non-static/index.md | ---
title: "SyntaxError: getter and setter for private name #x should either be both static or non-static"
slug: Web/JavaScript/Reference/Errors/Either_be_both_static_or_non-static
page-type: javascript-error
---
{{jsSidebar("Errors")}}
The JavaScript exception "mismatched placement" occurs when a private [getter](/e... | 0 |
data/mdn-content/files/en-us/web/javascript/reference/errors | data/mdn-content/files/en-us/web/javascript/reference/errors/invalid_bigint_syntax/index.md | ---
title: "SyntaxError: invalid BigInt syntax"
slug: Web/JavaScript/Reference/Errors/Invalid_BigInt_syntax
page-type: javascript-error
---
{{jsSidebar("Errors")}}
The JavaScript exception "invalid BigInt syntax" occurs when a string value is being coerced to a {{jsxref("BigInt")}} but it failed to be parsed as an in... | 0 |
data/mdn-content/files/en-us/web/javascript/reference/errors | data/mdn-content/files/en-us/web/javascript/reference/errors/stmt_after_return/index.md | ---
title: "Warning: unreachable code after return statement"
slug: Web/JavaScript/Reference/Errors/Stmt_after_return
page-type: javascript-error
---
{{jsSidebar("Errors")}}
The JavaScript warning "unreachable code after return statement" occurs when using an
expression after a {{jsxref("Statements/return", "return")... | 0 |
data/mdn-content/files/en-us/web/javascript/reference/errors | data/mdn-content/files/en-us/web/javascript/reference/errors/no_properties/index.md | ---
title: 'TypeError: "x" has no properties'
slug: Web/JavaScript/Reference/Errors/No_properties
page-type: javascript-error
---
{{jsSidebar("Errors")}}
The JavaScript exception "null (or undefined) has no properties" occurs when you
attempt to access properties of [`null`](/en-US/docs/Web/JavaScript/Reference/Opera... | 0 |
data/mdn-content/files/en-us/web/javascript/reference/errors | data/mdn-content/files/en-us/web/javascript/reference/errors/cyclic_prototype/index.md | ---
title: "TypeError: can't set prototype: it would cause a prototype chain cycle"
slug: Web/JavaScript/Reference/Errors/Cyclic_prototype
page-type: javascript-error
---
{{jsSidebar("Errors")}}
The JavaScript exception "TypeError: can't set prototype: it would cause a prototype chain cycle" occurs when an object's p... | 0 |
data/mdn-content/files/en-us/web/javascript/reference/errors | data/mdn-content/files/en-us/web/javascript/reference/errors/cant_access_lexical_declaration_before_init/index.md | ---
title: "ReferenceError: can't access lexical declaration 'X' before initialization"
slug: Web/JavaScript/Reference/Errors/Cant_access_lexical_declaration_before_init
page-type: javascript-error
---
{{jsSidebar("Errors")}}
The JavaScript exception "can't access lexical declaration \`_variable_' before initializati... | 0 |
data/mdn-content/files/en-us/web/javascript/reference/errors | data/mdn-content/files/en-us/web/javascript/reference/errors/missing_bracket_after_list/index.md | ---
title: "SyntaxError: missing ] after element list"
slug: Web/JavaScript/Reference/Errors/Missing_bracket_after_list
page-type: javascript-error
---
{{jsSidebar("Errors")}}
The JavaScript exception "missing ] after element list" occurs when there is an error
with the array initializer syntax somewhere. Likely ther... | 0 |
data/mdn-content/files/en-us/web/javascript/reference/errors | data/mdn-content/files/en-us/web/javascript/reference/errors/no_non-null_object/index.md | ---
title: 'TypeError: "x" is not a non-null object'
slug: Web/JavaScript/Reference/Errors/No_non-null_object
page-type: javascript-error
---
{{jsSidebar("Errors")}}
The JavaScript exception "is not a non-null object" occurs when an object is expected
somewhere and wasn't provided. [`null`](/en-US/docs/Web/JavaScript... | 0 |
data/mdn-content/files/en-us/web/javascript/reference/errors | data/mdn-content/files/en-us/web/javascript/reference/errors/unnamed_function_statement/index.md | ---
title: "SyntaxError: function statement requires a name"
slug: Web/JavaScript/Reference/Errors/Unnamed_function_statement
page-type: javascript-error
---
{{jsSidebar("Errors")}}
The JavaScript exception "function statement requires a name" occurs
when there is a [function statement](/en-US/docs/Web/JavaScript/Ref... | 0 |
data/mdn-content/files/en-us/web/javascript/reference/errors | data/mdn-content/files/en-us/web/javascript/reference/errors/bigint_negative_exponent/index.md | ---
title: "RangeError: BigInt negative exponent"
slug: Web/JavaScript/Reference/Errors/BigInt_negative_exponent
page-type: javascript-error
---
{{jsSidebar("Errors")}}
The JavaScript exception "BigInt negative exponent" occurs when a {{jsxref("BigInt")}} is raised to the power of a negative BigInt value.
## Message... | 0 |
data/mdn-content/files/en-us/web/javascript/reference/errors | data/mdn-content/files/en-us/web/javascript/reference/errors/more_arguments_needed/index.md | ---
title: "TypeError: More arguments needed"
slug: Web/JavaScript/Reference/Errors/More_arguments_needed
page-type: javascript-error
---
{{jsSidebar("Errors")}}
The JavaScript exception "more arguments needed" occurs when there is an error with how
a function is called. More arguments need to be provided.
## Messag... | 0 |
data/mdn-content/files/en-us/web/javascript/reference/errors | data/mdn-content/files/en-us/web/javascript/reference/errors/identifier_after_number/index.md | ---
title: "SyntaxError: identifier starts immediately after numeric literal"
slug: Web/JavaScript/Reference/Errors/Identifier_after_number
page-type: javascript-error
---
{{jsSidebar("Errors")}}
The JavaScript exception "identifier starts immediately after numeric literal" occurs
when an identifier started with a di... | 0 |
data/mdn-content/files/en-us/web/javascript/reference/errors | data/mdn-content/files/en-us/web/javascript/reference/errors/missing_curly_after_property_list/index.md | ---
title: "SyntaxError: missing } after property list"
slug: Web/JavaScript/Reference/Errors/Missing_curly_after_property_list
page-type: javascript-error
---
{{jsSidebar("Errors")}}
The JavaScript exception "missing } after property list" occurs when there is a mistake
in the [object initializer](/en-US/docs/Web/Ja... | 0 |
data/mdn-content/files/en-us/web/javascript/reference/errors | data/mdn-content/files/en-us/web/javascript/reference/errors/missing_colon_after_property_id/index.md | ---
title: "SyntaxError: missing : after property id"
slug: Web/JavaScript/Reference/Errors/Missing_colon_after_property_id
page-type: javascript-error
---
{{jsSidebar("Errors")}}
The JavaScript exception "missing : after property id" occurs when objects are created
using the [object initializer](/en-US/docs/Web/Java... | 0 |
data/mdn-content/files/en-us/web/javascript/reference/errors | data/mdn-content/files/en-us/web/javascript/reference/errors/label_not_found/index.md | ---
title: "SyntaxError: label not found"
slug: Web/JavaScript/Reference/Errors/Label_not_found
page-type: javascript-error
---
{{jsSidebar("Errors")}}
The JavaScript exception "label not found" occurs when a {{jsxref("Statements/break", "break")}} or {{jsxref("Statements/continue", "continue")}} statement references... | 0 |
data/mdn-content/files/en-us/web/javascript/reference/errors | data/mdn-content/files/en-us/web/javascript/reference/errors/invalid_array_length/index.md | ---
title: "RangeError: invalid array length"
slug: Web/JavaScript/Reference/Errors/Invalid_array_length
page-type: javascript-error
---
{{jsSidebar("Errors")}}
The JavaScript exception "Invalid array length" occurs when specifying an array length that is either negative, a floating number or exceeds the maximum supp... | 0 |
data/mdn-content/files/en-us/web/javascript/reference/errors | data/mdn-content/files/en-us/web/javascript/reference/errors/cant_convert_x_to_bigint/index.md | ---
title: "TypeError: can't convert x to BigInt"
slug: Web/JavaScript/Reference/Errors/Cant_convert_x_to_BigInt
page-type: javascript-error
---
{{jsSidebar("Errors")}}
The JavaScript exception "x can't be converted to BigInt" occurs when attempting to convert a {{jsxref("Symbol")}}, [`null`](/en-US/docs/Web/JavaScri... | 0 |
data/mdn-content/files/en-us/web/javascript/reference/errors | data/mdn-content/files/en-us/web/javascript/reference/errors/bad_radix/index.md | ---
title: "RangeError: radix must be an integer"
slug: Web/JavaScript/Reference/Errors/Bad_radix
page-type: javascript-error
---
{{jsSidebar("Errors")}}
The JavaScript exception "radix must be an integer at least 2 and no greater than 36"
occurs when the optional `radix` parameter of the
{{jsxref("Number.prototype.t... | 0 |
data/mdn-content/files/en-us/web/javascript/reference/errors | data/mdn-content/files/en-us/web/javascript/reference/errors/undeclared_var/index.md | ---
title: 'ReferenceError: assignment to undeclared variable "x"'
slug: Web/JavaScript/Reference/Errors/Undeclared_var
page-type: javascript-error
---
{{jsSidebar("Errors")}}
The JavaScript [strict mode](/en-US/docs/Web/JavaScript/Reference/Strict_mode)-only exception "Assignment to undeclared variable" occurs when ... | 0 |
data/mdn-content/files/en-us/web/javascript/reference/errors | data/mdn-content/files/en-us/web/javascript/reference/errors/cyclic_object_value/index.md | ---
title: "TypeError: cyclic object value"
slug: Web/JavaScript/Reference/Errors/Cyclic_object_value
page-type: javascript-error
---
{{jsSidebar("Errors")}}
The JavaScript exception "cyclic object value" occurs when object references were found
in [JSON](https://www.json.org/). {{jsxref("JSON.stringify()")}} doesn't... | 0 |
data/mdn-content/files/en-us/web/javascript/reference/errors | data/mdn-content/files/en-us/web/javascript/reference/errors/unparenthesized_unary_expr_lhs_exponentiation/index.md | ---
title: "SyntaxError: unparenthesized unary expression can't appear on the left-hand side of '**'"
slug: Web/JavaScript/Reference/Errors/Unparenthesized_unary_expr_lhs_exponentiation
page-type: javascript-error
---
{{jsSidebar("Errors")}}
The JavaScript exception "unparenthesized unary expression can't appear on t... | 0 |
data/mdn-content/files/en-us/web/javascript/reference/errors | data/mdn-content/files/en-us/web/javascript/reference/errors/malformed_uri/index.md | ---
title: "URIError: malformed URI sequence"
slug: Web/JavaScript/Reference/Errors/Malformed_URI
page-type: javascript-error
---
{{jsSidebar("Errors")}}
The JavaScript exception "malformed URI sequence" occurs when URI encoding or decoding
wasn't successful.
## Message
```plain
URIError: URI malformed (V8-based)
U... | 0 |
data/mdn-content/files/en-us/web/javascript/reference/errors | data/mdn-content/files/en-us/web/javascript/reference/errors/read-only/index.md | ---
title: 'TypeError: "x" is read-only'
slug: Web/JavaScript/Reference/Errors/Read-only
page-type: javascript-error
---
{{jsSidebar("Errors")}}
The JavaScript [strict mode](/en-US/docs/Web/JavaScript/Reference/Strict_mode)-only exception
"is read-only" occurs when a global variable or object
property that was assign... | 0 |
data/mdn-content/files/en-us/web/javascript/reference/errors | data/mdn-content/files/en-us/web/javascript/reference/errors/not_a_constructor/index.md | ---
title: 'TypeError: "x" is not a constructor'
slug: Web/JavaScript/Reference/Errors/Not_a_constructor
page-type: javascript-error
---
{{jsSidebar("Errors")}}
The JavaScript exception "is not a constructor" occurs when there was an attempt to use
an object or a variable as a constructor, but that object or variable... | 0 |
data/mdn-content/files/en-us/web/javascript/reference/errors | data/mdn-content/files/en-us/web/javascript/reference/errors/too_much_recursion/index.md | ---
title: "InternalError: too much recursion"
slug: Web/JavaScript/Reference/Errors/Too_much_recursion
page-type: javascript-error
---
{{jsSidebar("Errors")}}
The JavaScript exception "too much recursion" or "Maximum call stack size exceeded"
occurs when there are too many function calls, or a function is missing a ... | 0 |
data/mdn-content/files/en-us/web/javascript/reference/errors | data/mdn-content/files/en-us/web/javascript/reference/errors/strict_non_simple_params/index.md | ---
title: 'SyntaxError: "use strict" not allowed in function with non-simple parameters'
slug: Web/JavaScript/Reference/Errors/Strict_non_simple_params
page-type: javascript-error
---
{{jsSidebar("Errors")}}
The JavaScript exception "`"use strict"` not allowed in function" occurs
when a `"use strict"` directive is u... | 0 |
data/mdn-content/files/en-us/web/javascript/reference/errors | data/mdn-content/files/en-us/web/javascript/reference/errors/undefined_prop/index.md | ---
title: 'ReferenceError: reference to undefined property "x"'
slug: Web/JavaScript/Reference/Errors/Undefined_prop
page-type: javascript-error
---
{{jsSidebar("Errors")}}
The JavaScript warning "reference to undefined property" occurs when a script attempted
to access an object property which doesn't exist.
## Me... | 0 |
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