aliceFunc.js

function foo(a) { 
  return a() 
}

function bar(a) { 
  return 1 
}

// I am passing bar in to foo. bar is a callback function to foo
function woof() {
  foo(bar);
}

// I am calling foo inside woof
function woof() {
  foo();
}

// I am returning the value of foo inside woof
function woof() {
  return foo();
}

// I am saving the value of bar to a variable, and returning that value
function woof() {
  var hehe = bar();
  return hehe;
}