Closure in Swift: A reminder on how awesome they are.

I was re-reading Apple’s documentation about closure and I tough it couldn’t hurt anybody to share this little resume about closure syntax.

Here’s a simple closure :

reversedNames = names.sorted(by: { (s1: String, s2: String) -&gt; Bool in return s1 &gt; s2 })

1	reversedNames = names.sorted(by: { (s1: String, s2: String) -> Bool in return s1 > s2 })

Here’s the same but simpler :

reversedNames = names.sorted(by: { (s1: String, s2: String) -&gt; Bool in return s1 &gt; s2 } )

1	reversedNames = names.sorted(by: { (s1: String, s2: String) -> Bool in return s1 > s2 } )

Hmm even simpler :

reversedNames = names.sorted(by: { s1, s2 in return s1 &gt; s2 } )

1	reversedNames = names.sorted(by: { s1, s2 in return s1 > s2 } )

Huh ?!? Even more :

reversedNames = names.sorted(by: { s1, s2 in s1 &gt; s2 } )

1	reversedNames = names.sorted(by: { s1, s2 in s1 > s2 } )

WTF ?!?! Really ?! (but yeah it works) :

reversedNames = names.sorted(by: { $0 &gt; $1 } )

1	reversedNames = names.sorted(by: { $0 > $1 } )

And finally (unreadable but still) :

reversedNames = names.sorted(by: &gt;)

1	reversedNames = names.sorted(by: >)

Cheers,

MAB

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