Error Handling

import Cocoa

class LoginError {

    enum errorList : Error {
        case invalidNameLength(requiredLength: Int)
        case invalidPassLength(requiredLength: Int)
        case badPassword
        case identicalPasswords
    }

    func nameTooShort(_ name : String) throws {
        if name.count < 3 {
            throw errorList.invalidNameLength(requiredLength : 3)
        }
    }

    func passTooShort(_ pass : String) throws {
        if pass.count < 3 {
            throw errorList.invalidPassLength(requiredLength : 3)
        }
    }

    func identicalPasswords(_ pass1 : String, _ pass2 : String) throws {
        if pass1 == pass2 {
            throw errorList.identicalPasswords
        }
    }

    func invalidPassword(_ orgPass : String, _ enteredPass : String) throws {
        if orgPass != enteredPass {
            throw errorList.badPassword
        }
    }
}

class User {
    private var _name : String = ""
    private var _pass : String = ""

    let loginHandler = LoginError()

    init(name : String, pass : String) {
        createUser(name: name, pass: pass)
    }

    func checkLogin(name : String, pass : String) {
        do {
            try loginHandler.invalidPassword(self._pass, pass)
            print("Logged in successfully")
        }
        catch LoginError.errorList.badPassword {
            print("You entered invalid password")
        }
        catch {
            print("Something went wrong")
        }
    }

    func createUser(name : String, pass : String) {
        do {
            try loginHandler.nameTooShort(name)
            try loginHandler.passTooShort(pass)
            self._name = name
            self._pass = pass
            print("User created successfully")
        }
        catch LoginError.errorList.invalidNameLength(requiredLength: 3) {
            print("Name length too short")
        }
        catch LoginError.errorList.invalidPassLength(requiredLength: 3) {
            print("Password length too short")
        }
        catch {
            print("Something went wrong")
        }
    }

    func changePassword(pass : String) {
        do {
            try loginHandler.passTooShort(pass)
            try loginHandler.identicalPasswords(self._pass, pass)
            self._pass = pass
            print("Password changed successfully")
        }
        catch LoginError.errorList.invalidPassLength(requiredLength: 3) {
            print("Password length too short")
        }
        catch LoginError.errorList.identicalPasswords {
            print("Password is identical to your old password")
        }
        catch {
            print("Something went wrong")
        }
    }
}

var user = User(name : "Eran", pass: "12345")
user.changePassword(pass: "12")