trianglePattern.swift

var n = 8
var row = 2 * n - 1

for i in 1...n {
    for j in 1...row {
        let lowerRange = n-(i-1)
        let upperRange = n+(i-1)

        if j < lowerRange {
            print(" ", terminator: "    ")
        }
        if (lowerRange..<n).contains(j) {
            print(((i) - (n-j)), terminator: "    ")
        }

        if j == n {
           print(i, terminator: "    ")
        }

        if (n+1..<upperRange+1).contains(j) {
            print((i) - (j - n), terminator: "    ")
        }
    }
    print("")
}