const authCondition = (authUser) => !!authUser;
The author advice to use !!authUser instead of authUser. Is there any difference between authUser and !!authUser?
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1!! will make your function return a boolean (true or false) instead of anything that authUser might be. – Guy who types fast Aug 23 '18 at 19:38
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2The `authCondition` function can be replaced by the built-in `Boolean`. – Sebastian Simon Aug 23 '18 at 19:44