class Rectangle {
  constructor(height, width) {
    this.name = 'Rectangle'
    this.height = height
    this.width = width
  }
  sayName() {
    console.log(
      // here this references to the caller
      `Hi I am a ${this.name} with height ${this.height}, width ${this.width}.`
    )
  }
  get area() {
    return this.height * this.width
  }
  set area(value) {
    this.height = this.width = Math.sqrt(value)
  }
}

// extends is possible
class Square extends Rectangle {
  constructor(length) {
    super(length, length)
    this.name = 'Square'
  }

  sayName() {
    super.sayName()
    console.log(`Square talks too much`)
  }
}

['pikachu', 'carapuce', 'miaouss'].forEach(p => console.log(p)) // data iteration
['pikachu', 'carapuce', 'miaouss'].filter(p => p.length < 8) // data filtering
['pikachu', 'carapuce', 'miaouss'].map(p => `pokemon ${p}`) // data transformation

['pikachu', 'carapuce', 'miaouss']
	.filter(p => p.length < 8)
	.map(p => `pokemon ${p}`)
	.forEach(p => console.log(p)) // composability