Started Collection benchmarks

Makefile

@@ -7,4 +7,7 @@ test:
 app:
 	@$(NODE) examples/app.js
 
+benchmark:
+	@$(NODE) benchmarks/collection.js
+
 .PHONY: test

benchmarks/benchmark.js

@@ -0,0 +1,83 @@
+
+;(function(){
+	var currentSuite
+
+	/**
+	 * Contents of _fn_. Strips function literal and signature.
+	 *
+	 * @param  {function} fn
+	 * @return {string}
+	 * @api private
+	 */
+
+	function contentsOf(fn) {
+		return fn.toString().match(/^[^\{]*{((.*\n*)*)}/m)[1]
+	}
+
+	/**
+	 * Pad _str_ to _len_.
+	 *
+	 * @param  {string} str
+	 * @param  {integer} len
+	 * @return {string}
+	 * @api private
+	 */
+
+	function pad(str, len) {
+		return str + (new Array(len - str.length)).join(' ')
+	}
+
+	/**
+	 * Time the execution of _fn_
+	 *
+	 * @param  {function} fn
+	 * @return {float}
+	 * @api private
+	 */
+
+	function time(fn) {
+		var start = Number(new Date)
+		fn()
+		return (Number(new Date) - start) / 1000
+	}
+
+	/**
+	 * Benchmark _fn_ with the given _label_.
+	 *
+	 * @param {string} label
+	 * @param {function} fn
+	 * @api public
+	 */
+
+	function benchmark(label, fn) {
+		var duration = time(function(){
+			for (var i = 0; i < currentSuite.times; ++i)
+				fn()
+		}).toFixed(3)
+		print(pad('  ' + label, 50 - duration.toString().length) + duration + ' |')
+	}
+
+	/**
+	 * Create a benchmark suite with the given _label_, which
+	 * will run each benchmark n _times_. If _times_ is omitted
+	 * then it defaults to 1.
+	 *
+	 * @param  {string} label
+	 * @param  {integer, function} times
+	 * @param  {function} fn
+	 * @api public
+	 */
+
+	suite = function(label, times, fn) {
+		currentSuite = this
+		if (typeof times == 'function')
+		  this.times = 1, fn = times
+    else
+		  this.times = times
+		print('\n  ' + pad(label, 42 - this.times.toString().length) + this.times + ' time(s)')
+		print('  -------------------------------------------------')
+		eval(contentsOf(fn))
+		print('')
+	}
+
+})()

benchmarks/collection.js

@@ -0,0 +1,35 @@
+
+require.paths.unshift('lib')
+require.paths.unshift('benchmarks')
+process.mixin(GLOBAL, require('sys'))
+process.mixin(GLOBAL, require('benchmark'))
+require('express')
+
+print = puts
+
+range = function(a, b) {
+  var array = []
+  while (a++ < b)
+    array.push(a-1)
+  return array
+}
+
+suite('Collection with array', 100, function(){
+  array = range(0, 50000)
+
+  benchmark('for', function(){
+    for (var i = 0, len = array.length; i < len; ++i) ;
+  })
+
+  benchmark('for uncached', function(){
+    for (var i = 0; i < array.length; ++i) ;
+  })
+
+  benchmark('forEach', function(){
+    array.forEach(function(){})
+  })
+
+  benchmark('#each', function(){
+    $(array).each(function(){})
+  })
+})