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Compare performance of Array.indexOf and Object.hasOwnProperty for member lookup
var arr = [];
var i;
for (i=0; i<1000; i++) {
arr.push(i);
}
arr.push['fin'];
var obj = {};
for (i=0; i<1000; i++) {
obj[i] = 1;
}
obj['fin'] = true;
if (!Array.prototype.indexOf) {
Array.prototype.indexOf = function (searchElement /*, fromIndex */ ) {
"use strict";
if (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 (k in t && t[k] === searchElement) {
return k;
}
}
return -1;
}
}
Ready to run.
Test | Ops/sec | |
---|---|---|
Array.indexOf |
| ready |
Object.hasOwnProperty |
| ready |
lookup table |
| ready |
You can edit these tests or add more tests to this page by appending /edit to the URL.