Explain bindbind() function

Can someone explain this function?

var bindbind = Function.prototype.bind.bind(Function.prototype.bind);

I understand the result it produce:

var bindedContextFunc = bindbind(function)(context);
bindedContextFunc(args);

But do not understand process of creating this functions, I mean part bind(Function.prototype.bind)

Answers:

Answer

OK. We have three times the Function.prototype.bind function here, whose (simplified) code

function bind(context) {
    var fn = this;
    return function() {
        return fn.apply(context, arguments);
    }
}

I will abbreviate in a more functional style with lots of partial application: bindfn(context) -> fncontext.

So what does it do? You have got bind.call(bind, bind) or bindbind(bind). Let's expand this to bindbind. What if we now supplied some arguments to it?

bindbind(bind) (fn) (context)

bindbind(fn) (context)

bindfn(context)

fncontext

Here we are. We can assign this to some variables to make the result clearer:

bindbind = bindbind(bind)

bindfn = bindbindanything(fn) // bindfn

contextbindfn = bindfnanything(context) // fncontext

result = contextbindfnanything(args) // fncontext(args)

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