Some notes for sals cr

stringArrayExtensions.swift

var str = "Hello, playground"

protocol TestProtocol {
    typealias T
}
protocol AnotherProtocol {}

extension TestProtocol where Self.T == String {}



protocol Concatenable {
    typealias T
    func concatenate(lhs: T, conjunction: T, rhs: T?) -> T
}

extension Concatenable where Self.T == String {
    func concatenate(lhs: T, conjunction: T, rhs: T?) -> T {
        guard let rhs = rhs else { return lhs }
        if rhs.characters.count == 0 { return rhs }
        return lhs
    }
}

struct StringConcatenator: Concatenable {
    typealias T = String
}

let x = StringConcatenator().concatenate("left", conjunction: "+", rhs: "right")
x

I was thinking of creating a concatenatable protocol and extending it with generic constraints, depending on the generic type, you could have default implementations of the concatenate function.

I still would like an extension on string, and maybe some custom operators. "mystring".concat("+", nil)

look at concatenation in other libraries, maybe that string helper class, but then we'd want something for array