extend.js

/* setup
 *
 * npm install underscore extend benchmark
 *
 */

var Benchmark = require('benchmark');
var suite = new Benchmark.Suite;

var bento = require('./bento'); // 122K json file

var updated = {
    SearchResult: {
        BusinessListings: []
    }
};

for (var i = 0; i < 10; i++) {
    updated.SearchResult.BusinessListings[i] = { Zip: 12345 };
}

function ex(obj) {
    Array.prototype.slice.call(arguments, 1).forEach(function (source) {
        if (source) {
            for (var prop in source) {
                if (source.hasOwnProperty(prop)) {
                    obj[prop] = source[prop];
                }
            }
        }
    });

    return obj;
}

var _ = require('underscore');

var extend = require('extend');

// add tests
suite.add('Custom Extend', function() {
    var e = ex(bento, updated);
})
.add('Underscore Extend', function() {
    var e = _.extend(bento, updated);
})
.add('Extend Module', function() {
    var e = extend(bento, updated);
})
// add listeners
.on('cycle', function(event) {
  console.log(String(event.target));
})
.on('complete', function() {
  console.log('Fastest is ' + this.filter('fastest').pluck('name'));
})
// run async
.run({ 'async': true });