how does the for each method in underscore.js work?

Question

In underscore.js the for each method starts with the following:

var each = _.each = _.forEach = function(obj, iterator, context) {

How is it able to do something = something = something? I didn't think you could do that?

See: http://documentcloud.github.com/underscore/docs/underscore.html#section-12

Thanks

Answer 1

That's basically just defining aliases for the function(obj, iterator, context) that is created.

It's the same as doing var a = b = c = d = 0; All those vars are created and have the value 0.

Though the example I gave will actually create separate objects because a number is an intrinsic type. The one in your question will create those objects that all reference the same function.

Answer 2

It's mean that there is creating one local function each for local functions, and creating _.each and _.forEach methods in 'Underscore' scope. Thats all. It`s like

var a , b, c;
a = b = c = 3;
console.log(a,b,c) // 3,3,3