[рони]

AndreySt,

function add(a, b) {
    return a + b
}

function square(a) {
    return a * a
}

function fmap(a, b) {
    return function(c, d) {
        return a(b(c, d))
    }
};
var squareAdd = fmap(square, add);
alert(squareAdd(2,3));