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I was looking for a way of detecting the current browser using javascript code and came across an answer mentioned here at the same forum.

My question is: What is the meaning of !! (double exclamation symbol).

The value !!document.documentMode is returning a boolean value depending on whether the current browser is IE or not and the value document.documentMode returns the version of the IE browser.

I want to understand what !! actually signifies.

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hari
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So !! is not an operator, it's just the ! operator twice.

!oObject //Inverted boolean

!!oObject //Non inverted boolean so true boolean representation

What is the !! (not not) operator in JavaScript?

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Alexandre Beaudet
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