2 Equals and 3 equals code example

Example 1: javascript == vs ===

var one = 1;
var one_again = 1;
var one_string = "1";  // note: this is string

console.log(one ==  one_again);  // true
console.log(one === one_again);  // true
console.log(one ==  one_string); // true. 
console.log(one === one_string); // false.

Example 2: what is differ between between three equal and two equal

false == 0    =>  true
false === 0   =>  false

0 != false    =>  false
0 !== false   =>  true