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Skip to main content
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Skip to search
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just-in-time compiled
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first-class functions
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many non-browser environments
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Node.js
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Apache CouchDB
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Adobe Acrobat
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prototype-based
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garbage-collected
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dynamic
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APIs
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Web APIs
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DOM
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ECMAScript Language Specification
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ECMAScript Internationalization API specification
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proposals for new ECMAScript features
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stages
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Java programming language
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ECMAScript
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JavaScript guide
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JavaScript reference
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Beginner's tutorials
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JavaScript guides
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Reference
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learn web development core modules
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Your first website: Adding interactivity
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Dynamic scripting with JavaScript
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JavaScript frameworks and libraries
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Fundamental language guides
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Intermediate
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Advanced JavaScript objects
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Asynchronous JavaScript
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asynchronous
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Client-side web APIs
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JavaScript language overview
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JavaScript data structures
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Equality comparisons and sameness
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Enumerability and ownership of properties
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Closures
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Advanced
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Inheritance and the prototype chain
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Memory Management
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Standard objects
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Expressions and operators
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operator precedence
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Statements and declarations
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Functions
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Classes
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MDN contributors
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JavaScript
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Introduction
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Grammar and types
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Control flow and error handling
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Loops and iteration
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Functions
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Expressions and operators
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Numbers and strings
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Representing dates & times
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Regular expressions
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Indexed collections
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Keyed collections
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Working with objects
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Using classes
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Using promises
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JavaScript typed arrays
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Iterators and generators
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Resource management
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Internationalization
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JavaScript modules
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Meta programming
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AggregateError
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Array
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ArrayBuffer
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AsyncDisposableStack
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AsyncFunction
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AsyncGenerator
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AsyncGeneratorFunction
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AsyncIterator
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Atomics
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BigInt
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BigInt64Array
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BigUint64Array
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Boolean
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DataView
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Date
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decodeURI()
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decodeURIComponent()
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DisposableStack
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encodeURI()
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encodeURIComponent()
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Error
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escape()
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eval()
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EvalError
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FinalizationRegistry
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Float16Array
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Float32Array
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Float64Array
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Function
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Generator
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GeneratorFunction
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globalThis
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Infinity
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Int8Array
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Int16Array
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Int32Array
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InternalError
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Intl
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isFinite()
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isNaN()
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Iterator
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JSON
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Map
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Math
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NaN
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Number
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Object
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parseFloat()
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parseInt()
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Promise
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Proxy
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RangeError
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ReferenceError
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Reflect
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RegExp
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Set
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SharedArrayBuffer
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String
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SuppressedError
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Symbol
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SyntaxError
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Temporal
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TypedArray
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TypeError
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Uint8Array
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Uint8ClampedArray
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Uint16Array
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Uint32Array
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undefined
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unescape()
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URIError
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WeakMap
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WeakRef
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WeakSet
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Addition (+)
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Addition assignment (+=)
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Assignment (=)
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async function expression
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async function* expression
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await
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Bitwise AND (&)
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Bitwise AND assignment (&=)
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Bitwise NOT (~)
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Bitwise OR (|)
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Bitwise OR assignment (|=)
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Bitwise XOR (^)
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Bitwise XOR assignment (^=)
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class expression
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Comma operator (,)
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Conditional (ternary) operator
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Decrement (--)
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delete
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Destructuring
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Division (/)
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Division assignment (/=)
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Equality (==)
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Exponentiation (**)
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Exponentiation assignment (**=)
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function expression
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function* expression
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Greater than (>)
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Greater than or equal (>=)
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Grouping operator ( )
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import.meta
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import.meta.resolve()
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import()
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in
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Increment (++)
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Inequality (!=)
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instanceof
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Left shift (<<)
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Left shift assignment (<<=)
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Less than (<)
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Less than or equal (<=)
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Logical AND (&&)
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Logical AND assignment (&&=)
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Logical NOT (!)
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Logical OR (||)
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Logical OR assignment (||=)
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Multiplication (*)
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Multiplication assignment (*=)
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new
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new.target
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null
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Nullish coalescing assignment (??=)
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Nullish coalescing operator (??)
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Object initializer
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Optional chaining (?.)
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Property accessors
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Remainder (%)
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Remainder assignment (%=)
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Right shift (>>)
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Right shift assignment (>>=)
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Spread syntax (...)
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Strict equality (===)
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Strict inequality (!==)
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Subtraction (-)
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Subtraction assignment (-=)
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super
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this
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typeof
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Unary negation (-)
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Unary plus (+)
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Unsigned right shift (>>>)
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Unsigned right shift assignment (>>>=)
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void operator
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yield
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yield*
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async function
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async function*
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await using
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Block statement
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break
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class
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const
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continue
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debugger
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do...while
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Empty statement
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export
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Expression statement
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for
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for await...of
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for...in
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for...of
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function
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function*
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if...else
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import
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Import attributes
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Labeled statement
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let
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return
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switch
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throw
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try...catch
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using
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var
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while
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with
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Arrow function expressions
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Default parameters
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get
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Method definitions
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Rest parameters
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set
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The arguments object
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[Symbol.iterator]()
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callee
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length
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constructor
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extends
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Private elements
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Public class fields
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static
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Static initialization blocks
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Regular expressions
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Backreference: \1, \2
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Capturing group: (...)
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Character class escape: \d, \D, \w, \W, \s, \S
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Character class: [...], [^...]
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Character escape: \n, \u{...}
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Disjunction: |
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Input boundary assertion: ^, $
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Literal character: a, b
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Lookahead assertion: (?=...), (?!...)
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Lookbehind assertion: (?<=...), (?<!...)
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Modifier: (?ims-ims:...)
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Named backreference: \k<name>
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Named capturing group: (?<name>...)
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Non-capturing group: (?:...)
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Quantifier: *, +, ?, {n}, {n,}, {n,m}
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Unicode character class escape: \p{...}, \P{...}
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Wildcard: .
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Word boundary assertion: \b, \B
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Errors
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AggregateError: No Promise in Promise.any was resolved
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Error: Permission denied to access property "x"
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InternalError: too much recursion
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RangeError: argument is not a valid code point
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RangeError: BigInt division by zero
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RangeError: BigInt negative exponent
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RangeError: form must be one of 'NFC', 'NFD', 'NFKC', or 'NFKD'
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RangeError: invalid array length
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RangeError: invalid date
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RangeError: precision is out of range
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RangeError: radix must be an integer
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RangeError: repeat count must be less than infinity
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RangeError: repeat count must be non-negative
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RangeError: x can't be converted to BigInt because it isn't an integer
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ReferenceError: "x" is not defined
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ReferenceError: assignment to undeclared variable "x"
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ReferenceError: can't access lexical declaration 'X' before initialization
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ReferenceError: must call super constructor before using 'this' in derived class constructor
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ReferenceError: super() called twice in derived class constructor
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SyntaxError: 'arguments'/'eval' can't be defined or assigned to in strict mode code
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SyntaxError: "0"-prefixed octal literals are deprecated
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SyntaxError: "use strict" not allowed in function with non-simple parameters
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SyntaxError: "x" is a reserved identifier
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SyntaxError: \ at end of pattern
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SyntaxError: a declaration in the head of a for-of loop can't have an initializer
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SyntaxError: applying the 'delete' operator to an unqualified name is deprecated
|
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SyntaxError: arguments is not valid in fields
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SyntaxError: await is only valid in async functions, async generators and modules
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SyntaxError: await/yield expression can't be used in parameter
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SyntaxError: cannot use `??` unparenthesized within `||` and `&&` expressions
|
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SyntaxError: character class escape cannot be used in class range in regular expression
|
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SyntaxError: continue must be inside loop
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SyntaxError: duplicate capture group name in regular expression
|
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SyntaxError: duplicate formal argument x
|
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SyntaxError: for-in loop head declarations may not have initializers
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SyntaxError: function statement requires a name
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SyntaxError: functions cannot be labelled
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SyntaxError: getter and setter for private name #x should either be both static or non-static
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SyntaxError: getter functions must have no arguments
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SyntaxError: identifier starts immediately after numeric literal
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SyntaxError: illegal character
|
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SyntaxError: import declarations may only appear at top level of a module
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SyntaxError: incomplete quantifier in regular expression
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SyntaxError: invalid assignment left-hand side
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SyntaxError: invalid BigInt syntax
|
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SyntaxError: invalid capture group name in regular expression
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SyntaxError: invalid character in class in regular expression
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SyntaxError: invalid class set operation in regular expression
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SyntaxError: invalid decimal escape in regular expression
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SyntaxError: invalid identity escape in regular expression
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SyntaxError: invalid named capture reference in regular expression
|
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SyntaxError: invalid property name in regular expression
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SyntaxError: invalid range in character class
|
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SyntaxError: invalid regexp group
|
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SyntaxError: invalid regular expression flag "x"
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SyntaxError: invalid unicode escape in regular expression
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SyntaxError: JSON.parse: bad parsing
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SyntaxError: label not found
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SyntaxError: missing : after property id
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SyntaxError: missing ) after argument list
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SyntaxError: missing ) after condition
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SyntaxError: missing ] after element list
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SyntaxError: missing } after function body
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SyntaxError: missing } after property list
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SyntaxError: missing = in const declaration
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SyntaxError: missing formal parameter
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SyntaxError: missing name after . operator
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SyntaxError: missing variable name
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SyntaxError: negated character class with strings in regular expression
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SyntaxError: new keyword cannot be used with an optional chain
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SyntaxError: nothing to repeat
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SyntaxError: numbers out of order in {} quantifier.
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SyntaxError: octal escape sequences can't be used in untagged template literals or in strict mode code
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SyntaxError: parameter after rest parameter
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SyntaxError: private fields can't be deleted
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SyntaxError: property name __proto__ appears more than once in object literal
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SyntaxError: raw bracket is not allowed in regular expression with unicode flag
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SyntaxError: redeclaration of formal parameter "x"
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SyntaxError: reference to undeclared private field or method #x
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SyntaxError: rest parameter may not have a default
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SyntaxError: return not in function
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SyntaxError: setter functions must have one argument
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SyntaxError: string literal contains an unescaped line break
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SyntaxError: super() is only valid in derived class constructors
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SyntaxError: tagged template cannot be used with optional chain
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SyntaxError: Unexpected '#' used outside of class body
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SyntaxError: Unexpected token
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SyntaxError: unlabeled break must be inside loop or switch
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SyntaxError: unparenthesized unary expression can't appear on the left-hand side of '**'
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SyntaxError: use of super property/member accesses only valid within methods or eval code within methods
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SyntaxError: Using //@ to indicate sourceURL pragmas is deprecated. Use //# instead
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TypeError: 'caller', 'callee', and 'arguments' properties may not be accessed
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TypeError: 'x' is not iterable
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TypeError: "x" is (not) "y"
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TypeError: "x" is not a constructor
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TypeError: "x" is not a function
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TypeError: "x" is not a non-null object
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TypeError: "x" is read-only
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TypeError: already executing generator
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TypeError: BigInt value can't be serialized in JSON
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TypeError: calling a builtin X constructor without new is forbidden
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TypeError: can't access/set private field or method: object is not the right class
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TypeError: can't assign to property "x" on "y": not an object
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TypeError: can't convert BigInt to number
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TypeError: can't convert x to BigInt
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TypeError: can't define property "x": "obj" is not extensible
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TypeError: can't delete non-configurable array element
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TypeError: can't redefine non-configurable property "x"
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TypeError: can't set prototype of this object
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TypeError: can't set prototype: it would cause a prototype chain cycle
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TypeError: cannot use 'in' operator to search for 'x' in 'y'
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TypeError: class constructors must be invoked with 'new'
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TypeError: cyclic object value
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TypeError: derived class constructor returned invalid value x
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TypeError: getting private setter-only property
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TypeError: Initializing an object twice is an error with private fields/methods
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TypeError: invalid 'instanceof' operand 'x'
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TypeError: invalid Array.prototype.sort argument
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TypeError: invalid assignment to const "x"
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TypeError: Iterator/AsyncIterator constructor can't be used directly
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TypeError: matchAll/replaceAll must be called with a global RegExp
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TypeError: More arguments needed
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TypeError: null/undefined has no properties
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TypeError: property "x" is non-configurable and can't be deleted
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TypeError: Reduce of empty array with no initial value
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TypeError: setting getter-only property "x"
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TypeError: WeakSet key/WeakMap value 'x' must be an object or an unregistered symbol
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TypeError: X.prototype.y called on incompatible type
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URIError: malformed URI sequence
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Warning: -file- is being assigned a //# sourceMappingURL, but already has one
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Warning: unreachable code after return statement
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Execution model
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Lexical grammar
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Iteration protocols
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Strict mode
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Template literals
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Trailing commas
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Deprecated features
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-
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-
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-
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-
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-
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About
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Blog
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Mozilla careers
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Advertise with us
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MDN Plus
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Product help
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MDN Community
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Community resources
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Writing guidelines
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MDN Discord
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MDN on GitHub
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Web technologies
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Learn web development
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Guides
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Tutorials
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Glossary
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Hacks blog
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Mozilla Corporation’s
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Mozilla Foundation
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a Creative Commons license
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