node-promisePromises 实现

联合创作 · 2023-09-23 18:39

node-promise 在 Node.js 平台上提供了完整的 Promises 的实现。

The node-promise module features a promise implementation with:

  • Chainable promises
  • Promises throw errors if an error handler is not provided
  • CommonJS promise proposal [1] compliant
  • Immutable once fulfilled to reduce possible side-effects
  • Promises can be used securely (as separate resolver/promise pairs in ocap situations)
  • Backwards compatibility where possible (addCallback, addErrback, emitSuccess, and emitError should still behave as expected)

Utility functions, including:

  • when() - Normalization of sync (normal values) and async (promises)
  • all() - Create a promise that accumulate multiple concurrent promises
  • first() - Find the first promise to be fulfilled in a group of promises
  • seq() - Sequentially execute a set of promise returning functions
  • delay() - Returns a promise that is fulfilled after a given amount of time
  • execute() - Executes a function that takes a callback and returns a promise (thank you Benjamin Thomas for providing this)

示例代码:

var Promise = require("promise").Promise;
var promise = new Promise();
asyncOperation(function(){
  Promise.resolve("succesful result");
});
promise -> given to the consumer
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