Numbers can be written with, or without decimals:
var x1 = 34.00; // Written with decimals var x2 = 34; // Written without decimals
Extra large or extra small numbers can be written with scientific (exponential) notation:
var y = 123e5; // 12300000 var z = 123e-5; // 0.00123
You will learn more about numbers later in this tutorial.