JSPatterns.com » Blog Archive » Inheritance by copying properties

Inheritance by copying properties

Let's take a look at an inheritance pattern inheritance by copying properties. In this pattern an object gets functionality from another object, simply by copying it.

function extend(parent, child) {
  var i, child = child || {};
  for (i in parent) {
    child[i] = parent[i];
  return child;

In this implementation child is optional, if you don't pass an existing object to augmented, than a brand new is created and returned.

It's a very simple implementation, just looping through the parents members and copy them over.

Now you may say "Hey, hey, hey, what about performance? Isnt it inefficient to copy around properties like this?". Technically yes, but if thats your performance bottleneck, you probably have the fastest JavaScript app ever.

This works for many applications, Firebug has an extend() methods that does this. Firebug is a pretty complex app and this works for it, so it should work for many other applications.

And one more heads-up - this is a "shallow copy" of the object, if you need you can do a "deep copy" - checking if the property you're about to copy is an object and if so, recursively iterate through the properties.

Tags: , ,

Sorry, comments disabled and hidden due to excessive spam. Working on restoring the existing comments...

Meanwhile you can find me on twitter - @stoyanstefanov

hacklink panel bypass shell wso shell evden eve nakliyat hacklink satış hacklink paykasa hacklink hacklink satış hacklink panel hacklink al hacklink satis hacklink hacklink evden eve nakliyat istanbul evden eve nakliyat nakliyat nakliye evden eve nakliyat istanbul evden eve nakliyat nakliyat nakliye depolama Google film izle porno porno izle porno seyret seks hikayeleri Google Evden Eve Nakliyat İstanbul Evden Eve Nakliyat Nakliyat İstanbul Nakliyat istanbul Evden Eve Nakliyat Nakliye Firmaları Şehirler Arası Evden Eve Nakliyat