freeCodeCamp Challenge Guide: Perform a Difference on Two Sets of Data

Guide
1

Perform a Difference on Two Sets of Data

Solutions

Solution 1 (Click to Show/Hide) 
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;
  }

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

    return newSet;
  }

  difference(set) {
    const newSet = new Set();
    this.values().forEach(value => {
      if (!set.values().includes(value))
          newSet.add(value);
    })

    return newSet;
  }
}
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