Reduce example

ReduceExample.swift

func arrayToTuple(array: [Int]) -> (Int, Int, Int) {
    return array.reduce((0, 0, 0)) { temp, item in
        switch item {
        case 0..<10: return (temp.0 + 1, temp.1, temp.2)
        case 10..<100: return (temp.0, temp.1 + 1, temp.2)
        default:
            return item > 100 ? (temp.0, temp.1, temp.2 + 1) : temp
        }
    }
}


let a = [42, 7, 23, 146, 19]
let ar = arrayToTuple(array: a)
ar == (1, 3, 1)

let b = [1, 2, -34, 100, 33]
let br = arrayToTuple(array: b)
br == (2, 1, 0)