for in vs map

for_in_vs_map.swift

let range = 0..<10000000

var i = [Int]()
test("for in") {
    for n in range {
        i.append(n)
    }
}
print(String(i.count))

var j = [Int]()
test("map") {
    j = range.map { n in n }
}
print(String(j.count))