L&L.js

 
sayHi = function(){
  console.log('Hi');
}
 
sayHello = () => {
  console.log('Hello');
}
 
sayHey = function(someone){
  console.log('Hey ' + someone);
}
 
sayHey('guys');
// => 'Hey guys'
 
saySomething = function(guy, comment){
  comment(guy);
}
 
saySomething('Henry', function(toWho){
  console.log('Hey ' + toWho + ', hows it going?')
});
 
setCool = function(object){
  object.cool = true;
  return object
}
 
raquetBall = {
  isASport: true,
  ball: 'Raquet Ball'
}
  
raquetBall = setCool(raquetBall);
 
console.log(raquetBall.cool);
// => true