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// From Rachel M. Carmena's https://github.com/rachelcarmena/code-smells

class DistanceCalculator {
  betweenPoints(x1, y1, x2, y2) {
    return Math.sqrt(Math.pow((y2 - y1), 2) + Math.pow(x2 - x1, 2));
  }

  toOriginFrom(x, y) {
    return Math.sqrt(Math.pow(y, 2) + Math.pow(x, 2));
  }

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// From Fixing Object oriented abusers, Manh Phan https://ducmanhphan.github.io/2020-01-24-Fixing-object-oriented-abusers/

class CheckoutHandlder {
  // ...
  convertToCurrency(price, currencyTo) {
    if (currencyTo === "EUR") {
      return price * 0.9;
    } else if (currencyTo === "CAD") {
      return price * 1.35;
    } else {

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using System;
using System.Collections.Generic;
using NSubstitute;
using NSubstitute.Exceptions;
using Xunit;namespace KataTirePressureVariation.Test
{
    public class AlarmShould
    {
        private Sensor sensor;
        Notifier notifier;        

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Tools

• Jest
• Expect - Jest
• ts-mockito

Example of spying an interaction

interface Collaborator {
    collaborate(): void;
}

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using Xunit;

namespace Gilded_rose.Test
{
    public class GildedRoseTest
    {
        private const int MinQuality = 0;
        private const int MaxQuality = 50;

        [Fact]

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package com.gildedrose;

import static org.junit.jupiter.api.Assertions.assertEquals;

import org.junit.jupiter.api.Test;

public class GildedRoseTest {


  private static final int MIN_QUALITY = 0;

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Mars Rover movement

Description

In this exercise we'll implement from scratch part of the Mars Rover kata.

The rover interface would have only one method: receive(commands: string): void

This is a summary of the behavior of the rover that we'll implement:

trikitrok

// From Rachel M. Carmena's https://github.com/rachelcarmena/code-smells

class CoolStack<T> extends Array {

  push(...items: T[]): number {
    return super.push(...items);
  }

  public pop(): T {
    return super.pop();

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class Manager {
  private employee: Employee;

  constructor(employee: Employee) {
    this.employee = employee;
  }

  doThing(): void {
    this.employee.doThing();
  }

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// As a direct chain of calls
class FlightBooking {
  private plane: Plane;

  constructor(plane: Plane) {
    this.plane = plane;
  }

  // ...
  isSeatAvailable(rowNumber: number, seat: string): boolean {