Why === faster than == in JavaScript? [closed]

Answer 1

JavaScript is a weakly typed language, so it will apply type coercion wherever possible.

Equals Operator

// These are true
new Number(10) == 10; // Number.toString() is converted
                      // back to a number

10 == '10';           // Strings gets converted to Number
10 == '+10 ';         // More string madness
10 == '010';          // And more 
isNaN(null) == false; // null converts to 0
                      // which of course is not NaN

The Strict Equality Operator

It works like the normal equality operator, except that strict equality operator does not perform type coercion between its operands.

""           ===   "0"           // false
0            ===   ""            // false
0            ===   "0"           // false
false        ===   "false"       // false
false        ===   "0"           // false
false        ===   undefined     // false
false        ===   null          // false
null         ===   undefined     // false
" \t\r\n"    ===   0             // false

The above results are a lot clearer and allow for early breakage of code. This hardens code to a certain degree and also gives performance improvements in case the operands are of different types.

So === faster than == in Javascript

Here is good Reference