Monday, January 23, 2012

Unbounded function wrappers

I was reading "JavaScript Garden" (highly recommend for JS beginner/intermediate) and could not understand the concept of the "fast, unbound wrappers" for functions. See Function arguments for the example.

function Foo() {}

Foo.prototype.method = function(a, b, c) {
    console.log(this, a, b, c);

// Create an unbound version of "method" 
// It takes the parameters: this, arg1, arg2...argN
Foo.method = function() {

    // Result:, arg1, arg2... argN), arguments);

Luckily I found this Stackoverflow post that explains the idea behind it. It took me a while to wrap my head around ;-)

So, the basic idea is that we have a function defined in a class, but we want to use it without binding to specific object, maybe the concept of static method in Java? So, instead of creating an object and invoke the function on the object, we define the function as a property of the class, not on its prototype.

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