JS: For loop vs Array.indexOf (v40)

Revision 40 of this benchmark created on

Setup

var ar = [0, 1, 2, 3, 4, 5, 6, 7, 8, 9];
    
    Array.prototype.indexOf2 = function(searchElement /*, fromIndex */ ) {
      "use strict";
      if (this === void 0 || this === null) {
        throw new TypeError();
      }
      var t = Object(this);
      var len = t.length >>> 0;
      if (len === 0) {
        return -1;
      }
      var n = 0;
      if (arguments.length > 0) {
        n = Number(arguments[1]);
        if (n !== n) { // shortcut for verifying if it's NaN
          n = 0;
        } else if (n !== 0 && n !== Infinity && n !== -Infinity) {
          n = (n > 0 || -1) * Math.floor(Math.abs(n));
        }
      }
      if (n >= len) {
        return -1;
      }
      var k = n >= 0 ? n : Math.max(len - Math.abs(n), 0);
      for (; k < len; k++) {
        if (t[k] === searchElement) {
          return k;
        }
      }
      return -1;
    }

Test runner

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Testing in
TestOps/sec
indexOf2
var b = ar.indexOf2(5);
ready
indexOf
var a = ar.indexOf(5);
ready

Revisions

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