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There is no quick and easy facility for cloning an object, Some people recommend using JQuery.extend others JSON.parse/stringify
http://stackoverflow.com/questions/122102/what-is-the-most-efficient-way-to-clone-a-javascript-object
If you want the fastest possible clone function. I would personally anticipate the data structure of your object and write a custom clone to handle it.
<script src="http://code.jquery.com/jquery-2.0.3.js" type="text/javascript"></script>
<script>
var oldObject = {
a: 1,
b: 2,
c: 3,
d: 4,
e: 5,
f: function() {
return 6;
},
g: [7, 8, 9]
};
function clone(obj) {
var target = {};
for (var i in obj) {
if (obj.hasOwnProperty(i)) {
target[i] = obj[i];
}
}
return target;
}
Object.defineProperties(Object, {
'extend': {
'configurable': true,
'enumerable': false,
'value': function extend(what, wit) {
var extObj, witKeys = Object.keys(wit);
extObj = Object.keys(what).length ? Object.clone(what) : {};
witKeys.forEach(function(key) {
Object.defineProperty(extObj, key, Object.getOwnPropertyDescriptor(wit, key));
});
return extObj;
},
'writable': true
},
'clone': {
'configurable': true,
'enumerable': false,
'value': function clone(obj) {
return Object.extend({}, obj);
},
'writable': true
}
});
//Crockford clone function
function object(o) {
function F() {}
F.prototype = o;
return new F();
}
</script>
Ready to run.
Test | Ops/sec | |
---|---|---|
JQuery.extend deep |
| ready |
JSON |
| ready |
JQuery.extend |
| ready |
simple clone function |
| ready |
ES5 Object.clone |
| ready |
Crockford Clone Function |
| ready |
single obj clone |
| ready |
obj create |
| ready |
You can edit these tests or add more tests to this page by appending /edit to the URL.