===== JS Cheatsheet =====
==== Simple typer ====
boolean, number, string, null, undefined
console.log(typeof "JavaScript"); // "string"
console.log(typeof 10); // "number"
console.log(typeof 5.1); // "number"
console.log(typeof true); // "boolean"
console.log(typeof undefined); // "undefined"
console.log(typeof null); // "object"
==== Built-in typer ====
Array, Date, Error, Function, Object, RegExp
var items = new Array();
var now = new Date();
var error = new Error("Something bad happened.");
var func = new function("console.log('Hi');");
var object = new Object();
var re1 = new RegExp("\\d+","g");
var re2 = /\d+/g;