isType Functions

JavaScript performance comparison

Test case created by Tomás on 7th February 2013

 
<script>
  Benchmark.prototype.setup = function() {
    var toString = Object.prototype.toString;
  };
</script>

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Java applet disabled.

Testing in unknown unknown
Test		Ops/sec
Object.prototype.toString	`(function (obj) { return toString.call(obj) === '[object Object]'; }({}))`	pending…
instanceof Object	`(function (obj) { return obj instanceof Object && obj.constructor === Object; }({}))`	pending…
Array.prototype.toString	`(function (arr) { return toString.call(arr) === '[object Array]'; }([]))`	pending…
instanceof Array	`(function (arr) { return arr instanceof Array && arr.constructor === Array; }([]))`	pending…
String.prototype.toString	`(function (str) { return toString.call(str) === '[object String]'; }(''))`	pending…
instanceof String	`(function (str) { return str instanceof String && str.constructor === String; }(''))`	pending…
Number.prototype.toString	`(function (num) { return toString.call(num) === '[object Number]'; }(1))`	pending…
instanceof Number	`(function (num) { return num instanceof String && num.constructor === Number; }(1))`	pending…
typeof String	`(function (str) { return typeof str === 'string'; }(''))`	pending…
typeof Number	`(function (num) { return typeof num === 'number'; }(1))`	pending…