คลาส Set สมบูรณ์ใน JavaScript: MySet implementation

นี่คือการนำคลาส MySet มาใช้งานอย่างสมบูรณ์:

ตัวอย่าง

class MySet { 
  constructor() { 
    this.container = {}; 
  } 
  display() { 
    console.log(this.container); 
  } 
  has(val) { 
    return this.container.hasOwnProperty(val); 
  } 
  add(val) { 
    if (!this.has(val)) { 
      this.container[val] = val; 
      return true; 
    } 
    return false; 
  } 
  delete(val) { 
    if (this.has(val)) { 
      delete this.container[val]; 
      return true; 
    } 
    return false; 
  } 
  clear() { 
    this.container = {}; 
  } 
  forEach(callback) { 
    for (let prop in this.container) { 
      callback(prop); 
    } 
  } 
  static union(s1, s2) { 
    if (!s1 instanceof MySet || !s2 instanceof MySet) { 
      console.log("The given objects are not of type MySet"); 
      return null; 
    } 
    let newSet = new MySet(); 
    s1.forEach(elem => newSet.add(elem)); 
    s2.forEach(elem => newSet.add(elem)); 
    return newSet; 
  } 
  static difference(s1, s2) { 
    if (!s1 instanceof MySet || !s2 instanceof MySet) { 
      console.log("The given objects are not of type MySet"); 
      return null; 
    } 
    let newSet = new MySet(); 
    s1.forEach(elem => newSet.add(elem)); 
    s2.forEach(elem => newSet.delete(elem)); 
    return newSet; 
  } 
}