Bitwise / tilde operators

물결표시
http://rocha.la/JavaScript-bitwise-operators-in-practice

Bitwise NOT - The ~ operator

~2 === -3; //true
~1 === -2; //true
~0 === -1; //true
~-1 === 0; //true

~~2 === Math.floor(2); //true, 2
~~2.4 === Math.floor(2); //true, 2
~~3.9 === Math.floor(3); //true, 3

Summary

Use double bitwise NOT when:

  1. You want to convert the number from float to integer.
  2. You want to perform same operation as Math.floor() but a lot quicker.
  3. You want to minimalize your code.

Do not use double bitwise NOT when:

  1. You run Google Chrome (apparently?).
  2. You care about readability of your code.