Difference between variable = another vs var = !!another

Asked Jan 20 '21 at 21:03

Active Jan 21 '21 at 16:12

Viewed 31 times

I don't see an answer to this in Stack Overflow, so I'll go ahead and ask:

In jQuery, if I have a boolean display2, what is the difference between:

display = display2;

and

display = !!display2;

I'm working with a code base that uses the second line in it. Seems to me that both ways of setting display would be the same. In the second one you are setting display to the opposite of the opposite of display2, which I would think would just be the original value of display2. What am I missing?

edited Jan 21 '21 at 16:12

Lucky Brain

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asked Jan 20 '21 at 21:03

David Tarvin

https://stackoverflow.com/q/784929/3001761? – jonrsharpe Jan 20 '21 at 21:05
The suggested threads are related and close but don't clarify enough this question and it is worth asking this way as it is more a trick than a feature of JavaScript that needs clarification. – Lucky Brain Jan 20 '21 at 23:13
jQuery !== JavaScript – phuzi Jan 21 '21 at 13:50

Difference between variable = another vs var = !!another

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