A simple 𝗶𝘀𝗢𝗱𝗱 & 𝗶𝘀𝗘𝘃𝗲𝗻 extension to the 𝗜𝗻𝘁𝗲𝗴𝗲𝗿 type, which might come handy in many situations.

BinaryInteger+Utils.swift

extension BinaryInteger {
    /// Returns true if and only if this integer is even.
    var isEven: Bool { return self % 2 == 0 }
    /// Returns true if and only if this integer is odd.
    var isOdd: Bool { return self % 2 != 0 }
}