So let's not call it that. To be concise, it looks something like this: Whereas, null is falsey , so! Overall, the context that you saw simply adjusts this. In other words, if vertical is defined; this.
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So you're converting a value to a boolean, then inverting it, then inverting it again.
Another example is maybe all admins are id of 0 and non-admins are id 1 or higher. To get true if someone is not an admin you could do person. Few use cases, but it's concise when there is. Or in the case of a boolean value on the right, it does nothing. White Sep 10 '09 at In the case of a boolean the right-most! Net effect is that there is no change, but most engines will generate op codes for the double negation. But what is the point?
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This is useful for a little hack when you need to evaluate strings with "0" as false instead of true. DiegoDD why would you choose!! Crockford is moving his site around a bit; that link is liable to die at some point for a little on why: WScript, for instance, wins the prize. In this case, both "have a truthiness of falsy".
EDIT 24 Oct But if you see strange 0 s in your rendered JSX, think loose falsy management. So would you say the!!
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Nope, you wouldn't need it. Truthiness and true "externally" operate exactly the same in an if. I keep trying, but I can't think of a reason to prefer casting truthiness to a boolean value outside of the sort of convoluted "compare truthinesses" case, above, except for readability if you reuse the value later, as in the q library example.
But even then, it's a information-lossy shortcut, and I'd argue you're better off evaluating truthiness each time.
React is the main reason we've started using the!! I only have to worry about the truthiness or falseyness of something, not what the underlying type is. It's just the logical NOT operator, twice - it's used to convert something to boolean, e. Greg k 45 Why on earth would you do that? He's not comparing types; he's telling you what the results are, by writing assertions in his answer. It converts the suffix to a Boolean value. Paul McMillan 16k 7 47 Bill the Lizard k Prakash 5, 2 19 Season 1 The Deuce: Season 2 Fear the Walking Dead: Season 3 The Walking Dead: View All Photos 1.
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