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Comparing various approaches to iterating over an object's enumerable properties and assigning them to a different object using vanilla JS, underscore and lodash.
<script src="https://cdnjs.cloudflare.com/ajax/libs/lodash.js/3.9.3/lodash.min.js"></script>
<script>var lodash = _.noConflict();</script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/underscore.js/1.8.3/underscore-min.js"></script>
<script>var underscore = _.noConflict();</script>
var object = {};
var foo = {};
for (var i = 0; i < 333; ++i) {
object['user'+i] = 'user'+i;
}
Ready to run.
Test | Ops/sec | |
---|---|---|
lodash _.keys filtering |
| ready |
underscore _.keys filtering |
| ready |
vanilla keys filtering |
| ready |
lodash.keys & .each |
| ready |
underscore.keys & .each |
| ready |
vanilla for…in |
| ready |
underscore while over keys |
| ready |
lodash while over keys |
| ready |
vanilla while over keys |
| ready |
You can edit these tests or add more tests to this page by appending /edit to the URL.