bind allocation performance

_perf.md

Node 6

raynos at raynos-ThinkPad-T440p  ~/projects/temp
$ node bind-perf.js 
v8 version:  5.0.71.60
.bind() allocate time: 311
fbind() allocate time: 51
raynos at raynos-ThinkPad-T440p  ~/projects/temp
$ node bind-perf.js 
v8 version:  5.0.71.60
.bind() allocate time: 307
fbind() allocate time: 48

node 4

raynos at raynos-ThinkPad-T440p  ~/projects/temp
$ node bind-perf.js 
v8 version:  5.0.71.60
.bind() allocate time: 311
fbind() allocate time: 51
raynos at raynos-ThinkPad-T440p  ~/projects/temp
$ node bind-perf.js 
v8 version:  5.0.71.60
.bind() allocate time: 307
fbind() allocate time: 48

node0.10

raynos at raynos-ThinkPad-T440p  ~/projects/temp
$ node bind-perf.js 
v8 version:  3.14.5.9
.bind() allocate time: 1122
fbind() allocate time: 53
raynos at raynos-ThinkPad-T440p  ~/projects/temp
$ node bind-perf.js 
v8 version:  3.14.5.9
.bind() allocate time: 1118
fbind() allocate time: 55

bind-perf.js

'use strict';

var WARMUP = 100;
var ALLOCATE_ITER = 1000 * 1000;

function MyClass() {
    this.foo = 'some str';
    this.bar = 42;
}

MyClass.prototype.getFoo = function getFoo() {
    return this.foo;
}

function fbind(ctx, func) {
    return function bound() {
        return func.apply(ctx, arguments);
    };
}

if (typeof process !== 'undefined') {
    console.log('v8 version: ', process.versions.v8);
}

benchAllocateBind();
benchAllocateFBind();
// benchInvokeBind();

function benchAllocateBind() {
    var obj = new MyClass();
    var arr = [];

    for (var i = 0; i < WARMUP; i++) {
        arr[i % 10] = obj.getFoo.bind(obj);
    }

    var start = Date.now();

    for (i = 0; i < ALLOCATE_ITER; i++) {
        arr[i % 10] = obj.getFoo.bind(obj);
    }

    var end = Date.now();
    console.log('.bind() allocate time: ' + (end - start));
}


function benchAllocateFBind() {
    var obj = new MyClass();
    var arr = [];

    for (var i = 0; i < WARMUP; i++) {
        arr[i % 10] = fbind(obj, obj.getFoo);
    }

    var start = Date.now();

    for (i = 0; i < ALLOCATE_ITER; i++) {
        arr[i % 10] = fbind(obj, obj.getFoo);
    }

    var end = Date.now();
    console.log('fbind() allocate time: ' + (end - start));
}

Edge 14	Chrome 52	Firefox 48