CODEWITHSUNDEEP
swift
jcmiller11
jcmiller11

Reputation: 1291

Why sort([1,2,3]){true} doesn't work in Swift?

I know this example is entirely useless and contrived, but I'm trying to better wrap my head around how values get handled in Swift and I don't understand why the following code returns an error.

var notSorted = sort([1,2,3,4]){true}

Upvotes: 1

Views: 272

Answers (1)

Gabriele Petronella
Gabriele Petronella

Reputation: 108121

The second parameter of sort has type (T, T) -> Bool, but you are supplying a () -> Bool, namely a closure with no parameters that returns true.

Of course the two types don't match and you rightfully get a compile-time error.

Something like this will work:

var notSorted = sort([1,2,3,4]){_ in true}

By the way, that closure has the effect of reversing the array. If you want to perform a nop, you have to put false.

Upvotes: 4

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