free codecamp javascript

 JavaScript provides seven different data types which are undefined, null, boolean, string, symbol, number, and object



 We tell JavaScript to create or declare a variable by putting the keyword var in front of it
 var ourName;

In JavaScript, you can store a value in a variable with the assignment operator.

myVariable = 5;

Assigns the Number value 5 to myVariable.

// Postfix 
var x = 3;
y = x++; // y = 3, x = 4

// Prefix
var a = 2;
b = ++a; // a = 3, b = 3

// Postfix 
var x = 3;
y = x--; // y = 3, x = 2

// Prefix
var a = 2;
b = --a; // a = 1, b = 1

.pop()
 .shift()