Select () from LINQ in swift 3.0?

Question

Is there any alternative to the LINQ Select () method in Swift?

As an example, in C # I can do the following:

var ranks = cards.Select(a=> a.Rank).ToArray();

but how can I do the same using the Swift language?

Answer 1

map(_:)

let ranks = cards.map{ $0.Rank }

which is syntactic sugar for:

let ranks = cards.map({ (card: Card) -> Rank in
    return card.rank
})

Used syntactic sugar includes:

• Shadow Close Syntax

  let ranks = cards.map { (card: Card) -> Rank in
      return card.rank
  }
  

• Argument Type Inference

  let ranks = cards.map { card -> Rank in
      return card.rank
  }
  

• Output type return

  let ranks = cards.map { card in
      return card.rank
  }
  

• Implicit Return Value

  let ranks = cards.map { card in
     card.rank
  }
  

• Anonymous closing arguments

  let ranks = cards.map { $0.rank }
  

Check out the language instruction at close (Swift name for C # calling lambda) for more information,