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Comparing various approaches to iterating over an object's enumerable properties.
var object = {};
for (var i = 0; i < 100; ++i) {
object['user'+i] = 'user'+i;
}
var foo,
run = function (key) { foo = object[key]; },
run2 = function (key, val) { foo = val; };
Object.prototype.loop = function (callback) { for (var i = 0, keys = Object.keys(this), l = keys.length; i < l; ++i) {
callback(keys[i], this[keys[i]]);
}};
Object.prototype.loop2 = function (callback) { for (var i = 0, keys = Object.keys(this), l = keys.length; i < l; ++i) {
callback(keys[i]);
}};
Object.prototype.loop3 = function (callback) {
var i = 0,
keys = Object.keys(this),
l = keys.length;
for (; i < l; i += 1) {
callback(keys[i], this[keys[i]]);
}
};
Ready to run.
Test | Ops/sec | |
---|---|---|
for…in |
| ready |
for…in with continue |
| ready |
Filtering with Object.keys |
| ready |
Object.keys + forEach |
| ready |
Filtering with Object.keys and cache |
| ready |
For ... in cache |
| ready |
Filtering with Object.keys 2 |
| ready |
Filtering with Object.keys While |
| ready |
prototype loop1 |
| ready |
prototype loop1, key val |
| ready |
prototype loop1, cached |
| ready |
prototype loop1, key val cached |
| ready |
prototype loop2 |
| ready |
prototype loop2, cached |
| ready |
prototype loop3, key val cached |
| ready |
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