[JS] Function Currying

Currying allows you to easily create custom functions by partially invoking an existing function. Here’s a simple example:

var add = function(a,b) {
    return a + b;
}

//create function that returns 10 + argument
var addTen = add.curry(10);
addTen(20); //30

// ----------------------------------------

Function.prototype.curry = function() {
    if (arguments.length<1) {
        return this; //nothing to curry with - return function
    }
    var fToBind = this;
    var args = Array.prototype.slice.call(arguments); // Converting to array
    return function() {
        return fToBind.apply(this, args.concat(toArray(arguments)));
    }
}