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


I saw some code that seems to use an operator I don't recognize, in the form of two exclamation points, like so: !!. Can someone please tell me what this operator does?

The context in which I saw this was,

this.vertical = vertical !== undefined ? !!vertical : this.vertical;


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  • asked 7 years ago
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  • active 7 years ago

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