What is ~~ in javascript?

Question

Possible duplicate:
Understanding in different ways javascript NOT

I found it here: the question is before the interview questions below. What will this code ~~ 3.14 return?

I searched on google but found nothing on this.

+5

user1575795 Sep 26 '12 at 5:56

3 answers

Ashwin prabhu · Answer 1 · 2012-09-26T06:00:54+0000

It will return 3. ~represents the bitwise NOT operator in JavaScript.

Basically, ~ 3.14 matches ~ 3, which is ~ 011 in binary => 100 or 4 in base 10. ~ 4 or ~ 100 is 011 or 3 in base 10.

battery · Answer 2 · 2012-09-26T06:06:21+0000

~ - JavaScript ( C/++ ). : (~)?

:

, ~n -n-1 Two Complement.

Blender · Answer 3 · 2012-09-26T06:01:33+0000

32- .

x -(x + 1). , ~5 -6.

In your case:

  ~~3.14
= -((~3.14) + 1)
= -(-(3.14 + 1) + 1)
= -(-(3 + 1) + 1)
= -(-4 + 1)
= -(-3)
= 3