From 312de15c0a20b0f5bf5760e2aa42c30a172368e2 Mon Sep 17 00:00:00 2001
From: Manish <manish@radii.dev>
Date: Tue, 22 Aug 2023 11:01:25 +1000
Subject: [PATCH] Data Structures: Perform a Difference on Two Sets of Data

---
 Data Structures/setDifference.js | 87 ++++++++++++++++++++++++++++++++
 1 file changed, 87 insertions(+)
 create mode 100644 Data Structures/setDifference.js

diff --git a/Data Structures/setDifference.js b/Data Structures/setDifference.js
new file mode 100644
index 0000000..5f5b6c9
--- /dev/null
+++ b/Data Structures/setDifference.js	
@@ -0,0 +1,87 @@
+// https://www.freecodecamp.org/learn/coding-interview-prep/data-structures/perform-a-difference-on-two-sets-of-data
+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;
+  }
+  // This is our union method
+  union(set) {
+    const newSet = new Set();
+    this.values().forEach((value) => {
+      newSet.add(value);
+    });
+    set.values().forEach((value) => {
+      newSet.add(value);
+    });
+
+    return newSet;
+  }
+  // This is our intersection method
+  intersection(set) {
+    const newSet = new Set();
+
+    let largeSet;
+    let smallSet;
+    if (this.dictionary.length > set.length) {
+      largeSet = this;
+      smallSet = set;
+    } else {
+      largeSet = set;
+      smallSet = this;
+    }
+
+    smallSet.values().forEach((value) => {
+      if (largeSet.dictionary[value]) {
+        newSet.add(value);
+      }
+    });
+
+    return newSet;
+  }
+  // Only change code below this line
+
+  difference(otherSet) {
+    const diffSet = new Set();
+    this.values().forEach((item) => {
+      if (!otherSet.has(item)) {
+        diffSet.add(item);
+      }
+    });
+    return diffSet;
+  }
+
+  // Only change code above this line
+}