Type-driven URL templating in Swift

UrlTemplate.swift

import Foundation

struct StringTemplate<T> {
    var template: String
    
    init(_ template: String) {
        self.template = template
    }
    
    func fill(_ t: T) -> String {
        Mirror(reflecting: t).children.reduce(template) { (acc, next) in
            acc.replacingOccurrences(of: "{\(next.label!)}", with: "\(next.value)")
        }
    }
}

struct LMGTFY {
    var query: String
    var random: Int
}

var letMeGoogleBananasForYou = StringTemplate<LMGTFY>("https://lmgtfy.app/?q={query}&random={random}")
    .fill(.init(query: "Bananas", random: 123))

print(letMeGoogleBananasForYou)