Question

How do I pass functions as a parameter in JavaScript.

In the code below if I call whatMustHappen (TWO(),ONE()) I want to them to fall in the sequence of the x and the y on the whatMustHappen function.

Right now it fires as it sees it in the parameter.

var ONE = function() {
    alert("ONE");
}
var TWO = function() {
    alert("TWO");
}
var THREE = function() {
    alert("THREE");
}
var whatMustHappen = function(x, y) {
    y;
    x;
}
whatMustHappen(TWO(), null);
whatMustHappen(TWO(), ONE());

Answer 1

var whatMustHappen = function(x, y) {
        if (y) y();
        if (x) x();
    }
whatMustHappen(TWO, null);
whatMustHappen(TWO, ONE);