enumStage3.swift

enum Stage: String {
    case production
    case staging
    case dev
    case local
    init?(rawValue: String) {
       switch rawValue.lowercased() {
          case "prod", "production": self = .production
          case "qa", "staging": self = .staging
          case "dev": self = .dev
          case "local": self = .local
          default: return nul
       }
    }
}