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function RPS(){
    this.play = function(p1, p2, ui){
        new PlayUseCase(p1, p2, ui).execute()
    }
}

function PlayUseCase(p1, p2, ui){
    this.execute = function(){
        if (inputInvalid()){
            ui.invalid()

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Test Doubles

There are five types:

• Dummy
• Stub
• Spy
• Mock
• Fake

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React Cheat Sheet

Getting started with React is simple. There's only three things you need to know to get started: Components, props, and state.

Components

Components are the basic building blocks of a react app. They have a render method:

const React = require("react")

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//old school es5 syntax for creating a class
//advantage: lets you create private functions and state through closure
//disadvantage: looks weird if you learned OO through language like c++/java/ruby, etc. Doesn't support prototypical inheritance.

//constructor function
function MyES5Class(aPrivateVar){
  var aontherPrivateVar = "I'm a private variable! You can't access me from the outside."  
  this.publicVar = "I'm a public variable! You can access me from the outside!"
  
  this.myPublicFunction = function(){