Symbol.customMatcher for pattern matching
Module
Built-ins signatures
class Symbol {
static customMatcher: @@customMatcher;
}
Entry points
core-js/proposals/pattern-matching-v2
core-js(-pure)/full/symbol/custom-matcher
- Usage
- Supported engines and compatibility data
- 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 / Array.prototype.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.isError
- Explicit Resource Management
- Float16 methods
- Iterator helpers
- Object.values / Object.entries
- Object.fromEntries
- Object.getOwnPropertyDescriptors
- Accessible Object.prototype.hasOwnProperty
- String padding
- String.prototype.matchAll
- String.prototype.replaceAll
- String.prototype.trimStart / String.prototype.trimEnd
- RegExp s (dotAll) flag
- RegExp named capture groups
- RegExp escaping
- Promise.allSettled
- Promise.any
- Promise.prototype.finally
- Promise.try
- Promise.withResolvers
- Symbol.asyncIterator for asynchronous iteration
- Symbol.prototype.description
- Well-formed JSON.stringify
- Well-formed unicode strings
- New Set methods
- Math.sumPrecise
- Stage 3 proposals
- Stage 2.7 proposals
- Stage 2 proposals
- Stage 1 proposals
- Stage 0 proposals
- Pre-stage 0 proposals
- Finished proposals
- Web standards
- Iteration helpers
- ECMAScript
- Missing polyfills
- Contributing
- Security Policy