harajune

class Money<T extends Money<T>> {
  constructor(
    private readonly _value: number
  ) {
  }

  equals(other: T) {
    return this._value === other._value
  }

harajune

class Money<T extends Money<T>> {
  constructor(
    private readonly _value: number
  ) {
  }

  equals(other: T) {
    return this._value === other._value
  }

harajune

enum MoneyType {
  Dollar,
  Yen
}

class Money {
  constructor(
    private readonly _value: number,
    private readonly _type: MoneyType
  ) {}

harajune

// マーカーインターフェース
interface Money {
  getValue(): number
}

class Dollar implements Money {
  constructor(private readonly value: number) {}

  getValue() {
    return this.value

harajune

class Color {
  constructor(
    private red: number,
    private green: number,
    private blue: number
  ) { }

  public equals(color: Color) {
    return this.red === color.red &&
           this.green === color.green &&

harajune

class Color {
  constructor(
    private red: number,
    private green: number,
    private blue: number
  ) { }
}

const appleColor = new Color(255, 0, 0)
const bloodColor = new Color(255, 0, 0)

harajune

const array = [1]
const anotherArray = [1]

const reference = array
console.log(array === reference) // true
console.log(anotherArray === reference) // false

harajune

const array = [1]
const anotherArray = [1]
console.log(array === anotherArray)

harajune

const value = 1
const anotherValue = 1
console.log(value === anotherValue)

harajune

class PdfMerger:
  def __init__(self, outputFileName):
    self._merger = PdfFileMerger()
    self._outputFileName = outputFileName

  def append(self, pdf):
    self._merger.append(fileobj=pdf.fileObject, pages=(pdf.currentPage, pdf.currentPage + 1))

  def write(self):
    self._merger.write(self._outputFileName)