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Javascript: Function.Call()

Allows you to call (execute) a method of another object in the context of a different object (the calling object).

var result = fun.call(thisArg[, arg1[, arg2[, ...]]]);
 

You can assign a different this object when calling an existing function. this refers to the current object, the calling object.

With call, you can write a method once and then inherit it in another object, without having to rewrite the method for the new object.