Skip to content

Navigation Menu

Sign in
Appearance settings

Search code, repositories, users, issues, pull requests...

Provide feedback

We read every piece of feedback, and take your input very seriously.

Saved searches

Use saved searches to filter your results more quickly

Appearance settings

HowProgrammingWorks/NativeContracts

Open more actions menu

Repository files navigation

JavaScript Native Contracts

  • Callable — Any value that can be invoked with () operator
  • Function — Callable object, with optional this binding or arrow
  • AsyncFunction — Promise-returning Function
  • Callback — A function passed to another function to be called later. Callback-last-error-first — Callback contract or convention (error, result) signature, where error is Error | null, and result is returned if no error
  • Thenable — Any object with a .then(fn) method
  • Promise — Thenable with then, catch, and finally
  • Iterable — Has [Symbol.iterator]() that returns an Iterator
  • AsyncIterable — Has [Symbol.asyncIterator]() that returns an AsyncIterator
  • Iterator — Has .next() returning { value, done } structure
  • Generator — A function producing an Iterator (sync or async), supporting next(), throw(), return()
  • Array-like — Object with indexed keys 0, 1, ... and numeric .length, but no array methods
  • Observable — Push-based data sours available for subscription
  • EventTarget — DOM standard interface with .addEventListener(event, handler)
  • EventEmitter — Node.js style event emitter with .on(event, handler) and .emit(event, ...args)
  • Stream — Abstraction for flow (readable/writable/duplex) with backpressure support
Morty Proxy This is a proxified and sanitized view of the page, visit original site.