fcf1.js

// Function definition and invocation
function speak(string) {
  console.log(string);
}
speak("Hello");                     // logs "Hello"

// Store in a variable
var talk = speak;
talk("Hi");                         // logs "Hi"

// Pass as an argument to a function
// Return from a function
function functionReturner(fn) {
  return fn;
}
var chat = functionReturner(talk);
chat("Good Morning");               // logs "Good Morning"

// Store in a data structure
var myFuncs = [talk];
myFuncs[0]("Good Afternoon");       // logs "Good Afternoon"

// Owns properties
talk.myProperty = "bananas";
console.log(talk.myProperty);       // logs "bananas"