Create a method that chained each other. There is a name for this. But i forgot

Chaining.swift

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

import UIKit

class Test {
    var username: String?
    var password: String?
    
    var onSuccess: (() -> (Void))? = nil
    var onFailure: (() -> (Void))? = nil

    init() {
        
    }
    
    func login(username: String, password: String) -> Test {
        self.username = username;
        self.password = password;
        
        return self;
    }
    
    func onSuccess(_ onSuccess:@escaping () -> (Void)) -> Test {
        self.onSuccess = onSuccess
        return self
    }
    
    func onFailure(_ onFailure: @escaping () -> (Void)) -> Test {
        self.onFailure = onFailure
        return self
    }
    
    func run() {
        print(self.username ?? "")
        print(self.password ?? "")
        self.onFailure?()
        self.onSuccess?()
    }
}

Test().login(username: "test", password: "password")
    .onSuccess {
        print("success")
    }.onFailure {
        print("failure")
    }.run()