javascript - Any reason to use !0 instead of true? - Stack Overflow

I found some code using

!0
!1

I guess this is just the same things than

true
false

is there a reason for doing that or is just some abbreviation?

I found some code using

!0
!1

I guess this is just the same things than

true
false

is there a reason for doing that or is just some abbreviation?

• javascript

Share Follow asked Mar 25, 2013 at 14:39 PaoloPaolo 2,47266 gold badges3434 silver badges4545 bronze badges 6

• 5 Find who wrote that code and make a note not to hire him or her for any future work. :-) – Pointy Commented Mar 25, 2013 at 14:40
• 1 I would guess it's mainly for obfuscation/uglification. – Reinstate Monica -- notmaynard Commented Mar 25, 2013 at 14:42
• 3 @Pointy This code is produced by JavaScript Closure Compiler, as an example. Is it a time to fire it? ;) – VisioN Commented Mar 25, 2013 at 14:42
• @VisioN Ha ha! Well then that makes perfect sense I guess. – Pointy Commented Mar 25, 2013 at 14:44
• In JS it make sense, it can save some loading time. But its definetely ugly :-) – Gatekeeper Commented Mar 25, 2013 at 14:44

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1 Answer 1

Sorted by: Reset to default 17

If you really care about bandwidth and loading time then you need code pression. !0 and !1 is a pressed version of true and false.