除了循环和追加之外,是否有更快/更简洁的方法从阵列中获取多个索引？也许是以下的单线功能变体？
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","Bill"]
解决方法
你可以这样试试.
let result = indexesToGet.map { names[$0] }
要防止indexOutOfBounds崩溃,您可以使用flatMap.
let result = indexesToGet.flatMap { (names.count > $0) ? names[$0] : nil}
