How do you remove a method from a javascript type

javascript prototypal-inheritance
James Hollingworth picture James Hollingworth · Jul 25, 2011 · Viewed 7.5k times · Source

I have a bit of javascript that runs on a 3rd party's website which requires me to temporarily add a function to the Array type, e.g. 

Array.prototype.foo = function() { alert("foo's for everyone!"); };

I want to be a good developer and not pollute the type systems of other people's code as much as possible so once the function is no longer needed I want to remove the function again. Is this possible?

Answer

Kobi picture Kobi · Jul 25, 2011

You can use delete, which in general is good for removing all types of properties from objects: 

delete Array.prototype.foo;

Example: http://jsbin.com/iyamut
MDN Documentation: delete

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