Data Structures: Perform a Union on Two Sets

Data Structures/setsUnion.js

@@ -0,0 +1,62 @@
+// https://www.freecodecamp.org/learn/coding-interview-prep/data-structures/perform-a-union-on-two-sets
+
+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.values(this.dictionary);
+  }
+  // This method will add an element to the set
+  add(element) {
+    if (!this.has(element)) {
+      this.dictionary[element] = element;
+      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
+  union(otherSet) {
+    const unionSet = new Set();
+    for (let set of [this, otherSet]) {
+      for (let key in set.dictionary) {
+        unionSet.add(key);
+      }
+    }
+    return unionSet;
+  }
+  // Only change code above this line
+}
+
+const setA = new Set();
+for (let element of ["a", "b", "c"]) {
+  setA.add(element);
+}
+const setB = new Set();
+setB.add("c");
+setB.add("d");
+
+console.log(setA.union(setB));