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id	title	challengeType	videoUrl	dashedName
587d8253367417b2b2512c6c	在两个集上执行联合	1		perform-a-union-on-two-sets

--description--

在本练习中，我们将对两组数据执行联合。我们将在我们的Set数据结构上创建一个名为union 。此方法应将另一个Set作为参数，并返回两个集合的union集，不包括任何重复值。例如，如果setA = ['a','b','c']和setB = ['a','b','d','e'] ，则setA和setB的并集为： setA.union(setB) = ['a', 'b', 'c', 'd', 'e'] 。

--hints--

你的Set类应该有一个union方法。

assert(
  (function () {
    var test = new Set();
    return typeof test.union === 'function';
  })()
);

收回了适当的收藏

assert(
  (function () {
    var setA = new Set();
    var setB = new Set();
    setA.add('a');
    setA.add('b');
    setA.add('c');
    setB.add('c');
    setB.add('d');
    var unionSetAB = setA.union(setB);
    var final = unionSetAB.values();
    return (
      final.indexOf('a') !== -1 &&
      final.indexOf('b') !== -1 &&
      final.indexOf('c') !== -1 &&
      final.indexOf('d') !== -1 &&
      final.length === 4
    );
  })()
);

--seed--

--seed-contents--

class Set {
  constructor() {
    // This will hold the set
    this.dictionary = {};
    this.length = 0;
  }
  // This method will check for the presence of an element and return true or false
  has(element) {
    return this.dictionary[element] !== undefined;
  }
  // This method will return all the values in the set
  values() {
    return Object.keys(this.dictionary);
  }
  // This method will add an element to the set
  add(element) {
    if (!this.has(element)) {
      this.dictionary[element] = true;
      this.length++;
      return true;
    }

    return false;
  }
  // This method will remove an element from a set
  remove(element) {
    if (this.has(element)) {
      delete this.dictionary[element];
      this.length--;
      return true;
    }

    return false;
  }
  // This method will return the size of the set
  size() {
    return this.length;
  }
  // Only change code below this line

  // Only change code above this line
}

--solutions--

class Set {
  constructor() {
    this.dictionary = {};
    this.length = 0;
  }

  has(element) {
    return this.dictionary[element] !== undefined;
  }

  values() {
    return Object.keys(this.dictionary);
  }

  add(element) {
    if (!this.has(element)) {
      this.dictionary[element] = true;
      this.length++;
      return true;
    }

    return false;
  }

  remove(element) {
    if (this.has(element)) {
      delete this.dictionary[element];
      this.length--;
      return true;
    }

    return false;
  }

  size() {
    return this.length;
  }

  union(set) {
    const newSet = new Set();
    this.values().forEach(value => {
      newSet.add(value);
    })
    set.values().forEach(value => {
      newSet.add(value);
    })

    return newSet;
  }
}

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