【Swift】enumerateを使ったときの値の受け取り方 ref: http://qiita.com/ken0nek/items/5c9c3f5138fbbaf5e82c

file0.swift

[1, 2, 3, 4] -> ["0:1", "1:2", "2:3", "3:4"]

file1.swift

let array = [1, 2, 3, 4]
let pairList = array.enumerated().map { (tuple: (i: Int, ele: Int)) -> String in
    return "\(tuple.i):\(tuple.ele)"
}

file2.swift

let array = [1, 2, 3, 4]
let pairList = array.enumerated().map { tuple in
    return "\(tuple.0):\(tuple.1)"
}

file3.swift

let array = [1, 2, 3, 4]
let pairList = array.enumerated().map { tuple in
    return "\(tuple.offset):\(tuple.element)"
}

file4.swift

let array = [1, 2, 3, 4]
let pairList = array.enumerated().map { (i: Int, ele: Int) in
    return "\(i):\(ele)"
}

file5.swift

let array = [1, 2, 3, 4]
let pairList = array.enumerated().map { (i, ele) in
    return "\(i):\(ele)"
}

file6.swift

let array = [1, 2, 3, 4]
let pairList = array.enumerated().map { "\($0.0):\($0.1)" }

file7.swift

for (i, ele) in [1, 2, 3, 4].enumerated() {
    print(i, ele)
}

file8.swift

for tuple in [1, 2, 3, 4].enumerated() {
    print(tuple.offset, tuple.element)
}