Skip to content

Instantly share code, notes, and snippets.

@orioltf
Last active August 29, 2015 14:21
Show Gist options
  • Save orioltf/9a58a3ec99b118c8130d to your computer and use it in GitHub Desktop.
Save orioltf/9a58a3ec99b118c8130d to your computer and use it in GitHub Desktop.
#JS #UTIL Clone objects
/**
* In JavaScript assigning an Object to a new variable creates a reference to the original object. This means that changes to an element from the original object will be reflected on the new variable too. This util effectively duplicates a given Object/Array. Drawback: this action will increase the memory usage from your application.
* @param {Object|Array} source - the source object or Array to be duplicated.
* @returns {Object|Array} either the duplicated Object/Array or the original source element if it is neither an Object nor an Array.
*/
var clone = function(source) {
var copy, i;
if (Object.prototype.toString.call(source) === '[object Array]') {
copy = [];
for (i=0; i<source.length; i++) {
copy[i] = clone(source[i]);
}
return copy;
} else if (typeof(source) === 'object') {
copy = {};
for (var prop in source) {
if (source.hasOwnProperty(prop)) {
copy[prop] = clone(source[prop]);
}
}
return copy;
} else {
return source;
}
};
/ userBooks is a variable already set.
var userBooksClone = clone(userBooks);
Sign up for free to join this conversation on GitHub. Already have an account? Sign in to comment