Editing native vs. array.js vs. underscore

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Preparation code

Preparation code HTML (this will be inserted in the <body> of a valid HTML5 document in standards mode) (useful when testing DOM operations or including libraries)

<script src="http://underscorejs.org/underscore-min.js">
</script>
<script>(function(){function g(h,f,k){var c=g.resolve(h);if(null==c)throw k=k||h,f=f||"root",c=Error('Failed to require "'+k+'" from "'+f+'"'),c.path=k,c.parent=f,c.require=!0,c;f=g.modules[c];f.exports||(f.exports={},f.client=f.component=!0,f.call(this,f.exports,g.relative(c),f));return f.exports}var l=Object.prototype.hasOwnProperty;g.modules={};g.aliases={};g.resolve=function(h){"/"===h.charAt(0)&&(h=h.slice(1));for(var f=h+"/index.js",k=[h,h+".js",h+".json",h+"/index.js",h+"/index.json"],c=0;c<k.length;c++)if(h=
k[c],l.call(g.modules,h))return h;if(l.call(g.aliases,f))return g.aliases[f]};g.normalize=function(h,f){var g=[];if("."!=f.charAt(0))return f;h=h.split("/");f=f.split("/");for(var c=0;c<f.length;++c)".."==f[c]?h.pop():"."!=f[c]&&""!=f[c]&&g.push(f[c]);return h.concat(g).join("/")};g.register=function(h,f){g.modules[h]=f};g.alias=function(h,f){if(!l.call(g.modules,h))throw Error('Failed to alias "'+h+'", it does not exist');g.aliases[f]=h};g.relative=function(h){function f(c){var d=f.resolve(c);return g(d,
h,c)}var k=g.normalize(h,"..");f.resolve=function(c){var d=c.charAt(0);if("/"==d)return c.slice(1);if("."==d)return g.normalize(k,c);var d=h.split("/"),a;a:{for(a=d.length;a--;)if("deps"===d[a])break a;a=-1}(a+=1)||(a=0);return c=d.slice(0,a+1).join("/")+"/deps/"+c};f.exists=function(c){return l.call(g.modules,f.resolve(c))};return f};g.register("component-emitter/index.js",function(h,f,g){function c(d){if(d){for(var a in c.prototype)d[a]=c.prototype[a];return d}}g.exports=c;c.prototype.on=function(c,
a){this._callbacks=this._callbacks||{};(this._callbacks[c]=this._callbacks[c]||[]).push(a);return this};c.prototype.once=function(c,a){function j(){b.off(c,j);a.apply(this,arguments)}var b=this;this._callbacks=this._callbacks||{};a._off=j;this.on(c,j);return this};c.prototype.off=function(c,a){this._callbacks=this._callbacks||{};var j=this._callbacks[c];if(!j)return this;if(1==arguments.length)return delete this._callbacks[c],this;var b=j.indexOf(a._off||a);~b&&j.splice(b,1);return this};c.prototype.emit=
function(c){this._callbacks=this._callbacks||{};var a=[].slice.call(arguments,1),j=this._callbacks[c];if(j)for(var j=j.slice(0),b=0,e=j.length;b<e;++b)j[b].apply(this,a);return this};c.prototype.listeners=function(c){this._callbacks=this._callbacks||{};return this._callbacks[c]||[]};c.prototype.hasListeners=function(c){return!!this.listeners(c).length}});g.register("component-to-function/index.js",function(h,f,g){function c(a){switch({}.toString.call(a)){case "[object Object]":var j={},b;for(b in a)j[b]=
"string"===typeof a[b]?d(a[b]):c(a[b]);return function(a){if("object"!==typeof a)return!1;for(var b in j)if(!(b in a)||!j[b](a[b]))return!1;return!0};case "[object Function]":return a;case "[object String]":return b=/^ *\W+/.test(a)?new Function("_","return _ "+a):new Function("_","return _."+a),b;case "[object RegExp]":return function(b){return a.test(b)};default:return d(a)}}function d(a){return function(c){return a===c}}g.exports=c});g.register("array/index.js",function(g,f,k){k.exports=f("./lib/array")});
g.register("array/lib/array.js",function(g,f,k){function c(a){if(!(this instanceof c))return new c(a);a=a||[];for(var j=this.length=a.length,b=0;b<j;b++)this[b]=a[b]}g=f("emitter");f=f("./enumerable");var d=Array.prototype;k.exports=c;g(c.prototype);f(c.prototype);c.prototype.pop=function(){var a=d.pop.apply(this,arguments);this.emit("remove",a);return a};c.prototype.push=function(){for(var a=d.push.apply(this,arguments),c=[].slice.call(arguments),b=0,e=c.length;b<e;b++)this.emit("add",c[b]);return a};
c.prototype.shift=function(){var a=d.shift.apply(this,arguments);this.emit("remove",a);return a};c.prototype.splice=function(){for(var a=d.splice.apply(this,arguments),c=[].slice.call(arguments,2),b=0,e=a.length;b<e;b++)this.emit("remove",a[b]);b=0;for(e=c.length;b<e;b++)this.emit("add",c[b]);return a};c.prototype.unshift=function(){for(var a=d.unshift.apply(this,arguments),c=[].slice.call(arguments),b=0,e=c.length;b<e;b++)this.emit("add",c[b]);return a};c.prototype.toString=c.prototype.toJSON=function(){return d.slice.call(this)};
"sort reverse concat join slice lastIndexOf".split(" ").forEach(function(a){c.prototype[a]=function(){return d[a].apply(this,arguments)}})});g.register("array/lib/enumerable.js",function(g,f,k){var c=f("to-function"),d={};k.exports=function(a){for(var c in d)a[c]=d[c];return a};d.forEach=d.each=function(a){for(var c=this.length,b=0;b<c;b++)a(this[b],b);return this};d.map=function(a){a=c(a);for(var j=this.length,b=0;b<j;++b)this[b]=a(this[b],b);return this};d.filter=d.select=function(a){a=c(a);for(var j=
[],b=this.length,e,d=0;d<b;++d)e=this[d],a(e,d)&&j.push(e);return new this.constructor(j)};d.unique=function(){for(var a=[],c=this.length,b,e=0;e<c;++e)b=this[e],~this.indexOf(b)||a.push(b);return new this.constructor(a)};d.reject=function(a){var j=[],b=this.length,e,d;"string"==typeof a&&(a=c(a));if(a)for(d=0;d<b;++d)e=this[d],a(this[d],d)||j.push(e);else for(d=0;d<b;++d)e=this[d],e!=a&&j.push(e);return new this.constructor(j)};d.compact=function(){return this.reject(null)};d.find=function(a){a=
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d.min=function(a){var d=this.length,b=Infinity,e=0,f;if(a){a=c(a);for(f=0;f<d;++f)e=a(this[f],f),b=e<b?e:b}else for(f=0;f<d;++f)e=this[f],b=e<b?e:b;return b};d.sum=function(a){var d=this.length,b=0,e;if(a){a=c(a);for(e=0;e<d;++e)b+=a(this[e],e)}else for(e=0;e<d;++e)b+=this[e];return b};d.avg=d.mean=function(a){var d=this.length,b=0,e;if(a){a=c(a);for(e=0;e<d;++e)b+=a(this[e],e)}else for(e=0;e<d;++e)b+=this[e];return b/d};d.first=function(a){if(a){if("number"!==typeof a)return this.find(a)}else return this[0];
a=Math.min(a,this.length);for(var c=Array(a),b=0;b<a;++b)c[b]=c[b];return c};d.last=function(a){var c=this.length;if(a){if("number"!==typeof a)return this.findLast(a)}else return this[c-1];a=Math.max(0,c-a);for(var b=[];a<c;++a)b.push(this[a]);return b}});g.alias("component-emitter/index.js","array/deps/emitter/index.js");g.alias("component-to-function/index.js","array/deps/to-function/index.js");"object"==typeof exports?module.exports=g("array"):"function"==typeof define&&define.amd?define(g("array")):
window.array=g("array")})();</script>

Include JavaScript libraries as follows: <script src="//cdn.ext/library.js"></script>

Define setup for all tests (variables, functions, arrays or other objects that will be used in the tests) (runs before each clocked test loop, outside of the timed code region) (e.g. define local test variables, reset global variables, clear canvas, etc.) (see FAQ)

Define teardown for all tests (runs after each clocked test loop, outside of the timed code region) (see FAQ)

Code snippets to compare

Test 1

Title

Async (check if this is an asynchronous test)

Code

var arr = [1, 2, 3];

arr = arr.map(function(num) {
  return num + num;
});

Test 2

Title

Async (check if this is an asynchronous test)

Code

var arr = [1, 2, 3];

arr = array.map(arr, function(num) {
  return num + num;
});

Test 3

Title

Async (check if this is an asynchronous test)

Code

var arr = [1, 2, 3]

arr = _.map(arr, function(num) {
  return num + num;
});