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@jsmanifest

jsmanifest/logAndReturnIt.ts

Created March 6, 2020 06:44
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logAndReturnIt.ts
function logAndReturnIt(
valueThatIsGoingToBeLoggedAndReturnedFromAUselessFunction: null,
): null {
console.log(typeof valueThatIsGoingToBeLoggedAndReturnedFromAUselessFunction)
return valueThatIsGoingToBeLoggedAndReturnedFromAUselessFunction
}
logAndReturnIt(null) // valid
logAndReturnIt(5) // invalid
// TypeScript error: Argument of type '5' is not assignable to parameter of type 'null'.ts(2345)
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