Repetition of array elements

Array+Repetition.swift

extension Array {

    /// [1, 2, 3] by 2 produces: [1, 1, 2, 2, 3, 3]
    func replicated(times: UInt) -> Array {
        return self.reduce([], combine: { mem, curr in
            mem + Array(count: Int(times), repeatedValue: curr)
        })
    }
    
    /// [1, 2, 3] by 2 produces: [1, 2, 3, 1, 2, 3]
    func repeated(times: UInt) -> Array {
        var mem: [Element] = []
        for x in 0..<times {
            mem += self
        }
        return mem
    }

}

[1, 3].replicated(3)
[1, 2].repeated(3)

["a", "b"].replicated(2)
["a", "b"].repeated(2)