Faster way to get multiple elements from an array in Swift?

Question

Is there a faster/more concise way to get multiple indexes from an array besides looping, and appending? Maybe a one-liner functional variant of the following?

let names: [String] = ["John", "Mary", "Hugo", "Bill", "Andrea"]
let indexesToGet = [0, 1, 3]
var result: [String] = []
for i in 0..<indexesToGet.count {
    result.append(names[indexesToGet[i]])
}
return result
//returns ["John", "Mary", "Bill"]

Answer 1

You can try like this.

let result = indexesToGet.map { names[$0] }

To prevents from indexOutOfBounds crash you can use flatMap.

let result = indexesToGet.flatMap { (names.count > $0) ? names[$0] : nil}

From Swift 4.1 use compactMap instead of flatMap.

let result = indexesToGet.compactMap { (names.count > $0) ? names[$0] : nil}