Working With Functions

I want a function to take another function as a parameter, and execute it as a line of code. I put a simplified example below, just to illustrate the idea. Does anyone know the syntax to do this, or is there perhaps a better approach entirely?

// EXAMPLE

doSomething(5, 10, functionA, functionB);

function doSomething(x, y, myFunctionA, myFunctionB) {
if (x > y) {
myFunctionA();
} else {
myFunctionB();
}
}

function functionA() {
// some code
}

function functionB() {
// some code
}