PPP

A slim promise implementation.

• Status: UNSTABLE - Versions 0.8.x are preview releases, with possible API breaking changes between patch versions. I look forward to nailing down the API for version 1.0.x.

Goals

• to provide a simple, no-frills, compliant promise implementation.
• to limit the use of closure scope / function binding in an effort to lower memory thrashing in projects that make extensive promise use.
• to provide a measure of debug-ability despite asynchronous execution.

Usage

npm install ppp

var ppp = require('ppp');
 
var defer = ppp.Promise.defer();
 
defer.promise.then(function onSuccess(res) {
  console.log(res);
});
 
defer.resolve('hello world');

As a native polyfill

(function (global) {
  if (!global.Promise) {
    global.Promise = require('ppp').Promise;
  }
})(this);

Resources

• Promises A+ Spec
• ECMAScript 2015 Promise

Benchmarks

grunt benchmark

 # Memory:All
           ppp@0.8.6:   1.65 MB ±0.08 MB

     bluebird@2.9.30:   1.96 MB ±0.15 MB
             q@1.4.1:   6.66 MB ±1.05 MB
          vow@0.4.10:   3.65 MB ±0.38 MB

 # Memory:Then
           ppp@0.8.6:   0.63 MB ±0.04 MB

     bluebird@2.9.30:   1.31 MB ±0.13 MB
             q@1.4.1:   3.52 MB ±0.49 MB
          vow@0.4.10:   1.37 MB ±0.15 MB

 # Cpu:All
           ppp@0.8.6:    461 ops/sec ±1.18 %

     bluebird@2.9.30:    419 ops/sec ±1.44 %
             q@1.4.1:    142 ops/sec ±3.94 %
          vow@0.4.10:    426 ops/sec ±1.10 %

 # Cpu:Then
           ppp@0.8.6:    486 ops/sec ±1.39 %

     bluebird@2.9.30:    417 ops/sec ±2.03 %
             q@1.4.1:    191 ops/sec ±3.40 %
          vow@0.4.10:    459 ops/sec ±1.51 %

test/benchmark.html (Chrome)

 # Cpu:All
                 ppp:    156 ops/sec ±0.61 %

            bluebird:  78.70 ops/sec ±0.48 %
                   q:    134 ops/sec ±4.08 %
                 vow:    155 ops/sec ±0.77 %

 # Cpu:Then
                 ppp:    158 ops/sec ±0.61 %

            bluebird:  76.47 ops/sec ±1.20 %
                   q:    159 ops/sec ±2.70 %
                 vow:    156 ops/sec ±0.37 %