Pattern matching
Module
Built-ins signatures
class Symbol {
static customMatcher: @@customMatcher;
}
Entry points
core-js/proposals/pattern-matching
{ core-js, @core-js/pure }/full/symbol/custom-matcher
- Usage
- Supported engines and compatibility data
- TypeScript type definitions
- Features
- ECMAScript
- ECMAScript: Object
- ECMAScript: Function
- ECMAScript: Error
- ECMAScript: Array
- ECMAScript: Iterator
- ECMAScript: String and RegExp
- ECMAScript: Number
- ECMAScript: Math
- ECMAScript: Date
- ECMAScript: Promise
- ECMAScript: Symbol
- ECMAScript: Collections
- ECMAScript: Explicit resource management
- ECMAScript: Typed arrays
- ECMAScript: Reflect
- ECMAScript: JSON
- ECMAScript: globalThis
- ECMAScript proposals
- Finished proposals
- globalThis
- Relative indexing method
- Array.prototype.includes
- Array.prototype.{ flat, flatMap }
- Array find from last
- Change Array by copy
- Array grouping
- Array.fromAsync
- ArrayBuffer.prototype.transfer and friends
- Uint8Array to/from base64 and hex
- Error cause
- Error.isError
- Explicit resource management
- Float16
- Iterator helpers
- Iterator sequencing
- Iterator chunking
- Iterator includes
- Iterator join
- Joint iteration
- Object.values / Object.entries
- Object.fromEntries
- Object.getOwnPropertyDescriptors
- Accessible Object.prototype.hasOwnProperty
- String padding
- String.prototype.matchAll
- String.prototype.replaceAll
- String.prototype.{ trimStart, trimEnd }
- RegExp s (dotAll) flag
- RegExp named capture groups
- RegExp escaping
- Promise.allSettled
- Promise.any
- Promise.prototype.finally
- Promise.try
- Promise.withResolvers
- Asynchronous iteration
- Symbol.prototype.description
- JSON.parse source text access
- Well-formed JSON.stringify
- Well-formed Unicode strings
- New Set methods
- Map upsert
- Math.sumPrecise
- Stage 3 proposals
- Stage 2.7 proposals
- Stage 2 proposals
- Stage 1 proposals
- Stage 0 proposals
- Finished proposals
- Web standards
- Iteration helpers
- ECMAScript
- Missing polyfills
- Contributing
- Security policy