Comments on: Deep Copy in JavaScript

By: Dreaklyerurry

Dreaklyerurry — Wed, 15 Dec 2010 12:13:49 +0000

Exelent posts

Thank you for posting!

By: Bogs

Bogs — Wed, 01 Dec 2010 22:08:00 +0000

function clone(srcInstance)
{
if(typeof(srcInstance) != ‘object’ || srcInstance == null)
return srcInstance;
var newInstance = srcInstance.constructor();
for(var i in srcInstance)
newInstance[i] = clone(srcInstance[i]);
return newInstance;
}

// this pass your test exemple and is very shorter version

By: mu

mu — Fri, 08 Oct 2010 03:23:12 +0000

@Saravanan: we’re talking about deep copy of JavaScript objects here, not DOM nodes.

By: Saravanan

Saravanan — Tue, 06 Jul 2010 12:46:06 +0000

Instead of writing own methods we can try

document.cloneNode(objecttobecloned)

object.cloneNode(objecttobecloned)

By: cv

cv — Wed, 23 Sep 2009 17:15:00 +0000

…and it works better that way with deeply-nested structures.

By: cv

cv — Wed, 23 Sep 2009 17:14:22 +0000

You can reduce to a single function and one loop by refactoring to use beget.

By: Daniel

Daniel — Thu, 12 Mar 2009 06:49:06 +0000

I appreciate the need to deep copy an object…however unless its absolutely necessary, i’d recommend designing your code to benefit from references

By: jj

jj — Fri, 26 Sep 2008 13:41:37 +0000

The above does not handle nulls properly, here is another version

var ObjectHandler = {
//public method
getCloneOfObject: function(oldObject,level) {
var tempClone;

if ( level == undefined )
level = 0;

if ( oldObject == null )
tempClone = null;
else if ( typeof(oldObject) == “object” && oldObject.length != undefined )
{
//array
tempClone = new Array;
for ( var i = 0; i < oldObject.length; ++i )
{
tempClone[tempClone.length] = ObjectHandler.getCloneOfObject(oldObject[i],level + 1);
}
}
else if ( typeof(oldObject) == “object” )
{
//object
tempClone = new Object;
for ( var i in oldObject )
{
tempClone[i] = ObjectHandler.getCloneOfObject(oldObject[i],level + 1);
}
}
else
{
//plain
print (“Level=” + level + ” Plain=” + oldObject);
tempClone = oldObject;
}

return tempClone;
}
};