!= vs !== js code example
Example 1: != vs !== javascript
(0 == '0') // true
(0 === '0') // false
('' == 0 ) // true, the string will implicitly be converted to an integer
('' === 0 ) // false, no implicit cast is being made
Example 2: 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 3: == vs === javascript
== Equal to (1 == 1, 1 == "1") // equal in value ("1" is a string)
=== Equal value and equal type (1 === 1 but, 1 !== "1" // not equal type
Example 4: javascript !! vs !
// !! used for checking availability of data
!!'hello' // true