Is there any way to make a function's return accessible via a property?

Question

I\'m a JS dev, experimenting with functional programming ideas, and I\'m wondering if there\'s anyway to use chains for synchronous functions in the way the promise chains are w

Answer 1

It is really a bad idea to modify Function.prototype or Number.prototype because you will pollute the default JavaScript objects, say: what if other framework also do the evil and add their own square?

The recommended way is to make an object by your self.

function num(v) {
    this.v = v;
    this.val = function() { return this.v; };

    this.square = function() { this.v = this.v * this.v; return this; };
    //and you can add more methods here
    this.sqrt = function() { this.v = Math.sqrt(this.v); return this; };
    return this;
}

var n = new num(2)
console.log(n.square().square().sqrt().val());