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What is the use of !! (not not) in JavaScript?

I inherited a project that included a code in the form of !!someVar, as far as I can think, this is a double negation and would be the same as just using someVar instead, am I wrong?

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JavaScript

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@ashleyfreemanAug 11.2022 — It's just a quick way to convert any type of variable to a boolean. The variable is first evaluated as boolean and set to the opposite and then set back to the original boolean value.
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