(a == 1 && a == 2 && a ==3).swift

Immutable.swift

//: Playground - noun: a place where people can play

struct EqualsMultiple<T: Equatable> {
    let values: [T]
}

extension EqualsMultiple: ExpressibleByArrayLiteral {
    typealias ArrayLiteralElement = T

    init(arrayLiteral elements: T...) {
        values = elements
    }
}

func ==<T>(lhs: EqualsMultiple<T>, rhs: T) -> Bool {
    return lhs.values.contains(rhs)
}

func ==<T>(lhs: T, rhs: EqualsMultiple<T>) -> Bool {
    return rhs == lhs
}

let a: EqualsMultiple = [1,2,3]

if a == 1 && a == 2 && a == 3 {
    print("Success!")
}