function sayHiLater() {
var greeting = 'Hi';
setTimeOut(function() {
console.log('hi')
}, 3000);
}
sayHiLater();
//jQuery uses function expressions and first-class functions!
$("button").click(function() {
});
function tellMeWhenDone(callback){
var a = 1000;
var b = 2000;
callback();
}
tellMeWhenDone(function() {
console.log('I am done');
});