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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-1.5.1.js" type="text/javascript"></script>
<script>
var oldObject = {"mirror-char|rahc-rorrim":{"from":["c","d"],"do":["c","0","c","1","c","2","c","3","c","4","c","5","c","6","c","7","7","|",["3",["6",["4",["0",["1","t","2","1","t","2"],"0"],"4"],"|",["5",["4",["2",["0","|",["1","|","1"],"|","0"],"2"],"|",["2","|",["1","|",["0","|","0"],"|","1"],"|","2"],"|","4"],"5"],"|","6"],"3"],"|","7","7","d","6","d","5","d","4","d","3","d","2","d","1","d","0","d"],"to":["c","d"]},"str|len":{"from":["s","count"],"do":["s",["s","temp","s","temp","s","temp","s","temp","s","temp","s","temp","s","temp","s","temp","count",{"call":"str|len","args":["s","count"]},"|","count","temp","s","temp","s","temp","s","temp","s","temp","s","temp","s","temp","s","temp","s"],"s"],"to":["s","count"]},"revloop|poolver":{"from":["in","count","out"],"do":["count",["in",[{"call":"mirror-char|rahc-rorrim","args":["in","out"]}],"out",{"call":"revloop|poolver","args":["in","count","out"]}],"count"],"to":["in","count","out"]},"reverse|esrever":{"from":["in","out"],"do":[{"call":"str|len","args":["in","count"]},{"call":"revloop|poolver","args":["in","count","out"]},{"call":"nel|rts","args":["count","out"]}],"to":["in","out"]},"main":{"from":["in"],"do":[{"call":"reverse|esrever","args":["in","out"]}],"to":["out"]}}
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
}
});
</script>
Ready to run.
Test | Ops/sec | |
---|---|---|
JQuery.extend deep |
| ready |
JSON |
| ready |
JQuery.extend |
| ready |
simple clone function |
| ready |
ES5 Object.clone |
| ready |
You can edit these tests or add more tests to this page by appending /edit to the URL.