Data Structures: Create a Set Class

Data Structures/setClass.js

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+class Set {
+  constructor() {
+    // Dictionary will hold the items of our 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);
+  }
+
+  // Only change code below this line
+  add(item) {
+    if (this.dictionary[item] === undefined) {
+      this.dictionary[item] = true;
+      this.length++;
+      return true;
+    }
+    return false;
+  }
+
+  remove(item) {
+    if (this.dictionary[item] === undefined) {
+      return false;
+    }
+    delete this.dictionary[item];
+    this.length--;
+    return true;
+  }
+
+  size() {
+    return this.length;
+  }
+  // Only change code above this line
+}