How to fix Contextual closure type '((String, JSON), (String, JSON)) -> Bool' expects 2 arguments, but 1 was used in closure body?

Question

I am converting my code from swift 3.2 to swift 4 and I am getting error for this code

self.arrData = json.sorted{ $0.0.1["chkincount"].doubleValue > $0.1.1["chkincount"].doubleValue }.map { $0.1 }

Contextual closure type '((String, JSON), (String, JSON)) -> Bool' expects 2 arguments, but 1 was used in closure body

How to fix this ?

Does this answer your question? "contextual closure type expects 2 arguments" error when using reduce in Swift 4 — pkamb
– pkamb, Commented Sep 3, 2020 at 0:47
@pkamb I already got answer to my question and the link that you are referring was to there at the I posted my question. — Varun Naharia
– Varun Naharia, Commented Sep 3, 2020 at 8:36

Nirav D · Accepted Answer · 2017-06-16 05:46:04Z

2

In sorted closure changed $0.0.1 with $0.1 to access first closure argument and $0.1.1 with $1.1 to access second closure argument after making this changes you all set to go.

self.arrData = json.sorted{ $0.1["chkincount"].doubleValue > $1.1["chkincount"].doubleValue }.map { $0.1 }

answered Jun 16, 2017 at 5:46

Nirav D

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4 Comments

Varun Naharia Over a year ago

Can you please explain why this code is working in swift 4 and above is not working ?

Nirav D Over a year ago

@VarunNaharia I have already write in my answer that you haven't access the second argument $1 in your closure so you need to access that instead of $0.1 it is $1 as of $0 and $1 represent (String, JSON) not the ((String,JSON),(String,JSON))

Nirav D Over a year ago

@VarunNaharia May be they have changed that in Swift 4.

Hamish Over a year ago

github.com/apple/swift-evolution/blob/master/proposals/…

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