【JavaScript】classの使い方、Rubyとの対比

要旨

class Person {
  constructor(name, height, weight) {
    this.name = name
    this.height = height
    this.weight = weight
  }

  getData () {
    return {
      name: this.name,
      height: this.height,
      weight: this.weight,
    }
  }
}
taro = new Person('taro', 180, 60)
console.log(taro.getData())  // => {name: 'taro', height: 180, weight: 60}

classをJSで使用する例

詳細

Rubyで書いたらこんな感じ。

class Person
  def initialize(name, height, weight)
    @name = name
    @height = height
    @weight = weight
  end

  def getData
    return {
      name: @name,
      height: @height,
      weight: @height,
    }
  end
end

taro = Person.new('taro', 180, 60)
taro.getData  # => {:name=>"taro", :height=>180, :weight=>180}

classの定義はホイスティングされないので注意。

参考

developer.mozilla.org