gistfile1.txt

'use strict';

var _ = require('underscore');
var data = {};
var timing = require('./timing');

console.log('generating');
for (var i = 1; i < 100000; i++) {
    data['item' + i.toString(10)] = i;
}

function testForIn() {
    var len = 0;

    var keys = Object.keys(data);
    var length = keys.length;

    for (var i = 0; i < 100; i++) {
        for (var j = 0; j < length; j++) {
            len = len + data[keys[j]];
        }
    }
    console.log(len);
}

function testEach() {
    var len = 0;

    function cb(k) { len = len + data[k] }

    var keys = Object.keys(data)

    for (var i = 0; i < 100; i++) {
        _.each(keys, cb);
    }
    console.log(len);
}

timing.runTest('Using _.each to iterate object properties', testEach);
timing.runTest('Using for.in to iterate object properties', testForIn);

//timing.runTest('Using for.in to iterate object properties', testForIn);
//timing.runTest('Using _.each to iterate object properties', testEach);