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ES6: Use class Syntax to Define a Constructor Function

class Vegetable {
  constructor(name) {
    this.name = name;
  }
}
const carrot = new Vegetable('carrot');

Classes and constructor functions in ES6

class Func {
  constructor(a, b) {
    this.a = a
    this.b = b
  }

  getSum() {
    return this.a + this.b
  }
}

let x = new Func(3, 4)