delegation by composition #02

// Another Simple example

// Simplest compose
var compose = function(f, g) {   
    return function(x) {
        return f(g(x));
    };
};

var add1 = function(x) {return x + 1;};
var mult2 = function(x) {return x * 2;};
var square = function(x) {return x * x;};
var negate = function(x) {return -x;};

console.log(add1(42)); // 43
console.log(square(7)); // 49

var f = compose(add1, square); 
console.log(f(7)); // 50

Drawbacks:

It loses track of the this context used to call it.
It ignores all but the first argument passed to the initial function.