Swift: Get an array of element from an array of tuples

问题

I have an array of tuples like this :

var answers: [(number: Int, good: Bool)]

I want to get from it an array of number member. Like if I did something like :

answers["number"] // -> Should give [Int] of all values named "number"

I didn't find anything like it, maybe it's not possible, but it would be sad :(

回答1:

That's simple:

answers.map { $0.number }

回答2:

var ints = answers.map { tuple in
    tuple.0
}

回答3:

If your tuple is not named you can do this:

let mappedInts = answers.map({$0.0})
let mappedBools = answers.map({$0.1})

来源：https://stackoverflow.com/questions/26536538/swift-get-an-array-of-element-from-an-array-of-tuples