JavaScript !!"false"

I expected !!"false" to return false i.e.开发者_如何学C !"false" would return true, so !!"false" would return "false", but when I tested it in the console, !!"false" returned true.

Why didn`t things happen as expected?

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"false" is a non-empty string, which evaluates to true. Hence !"false" is false and !!"false" is true. You were probably thinking of !!false.

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The reason this is occurring because anything other than an empty string will return true.