Initial commit

Utility/LinkedList.js

@@ -0,0 +1,73 @@
+class LinkedListNode {
+    constructor(key, value) {
+        this.key = key;
+        this.value = value;
+        this.next = null;
+    };
+};
+
+class LinkedList {
+    constructor() {
+        this.map = new Map();
+        this.head = null;
+        this.tail = null;
+    };
+
+    getElement(id) {
+        const element = this.map.get(id);
+        if (!element) return;
+
+        return element.value;
+    }
+
+    hasElement(id) {
+        return this.map.has(id);
+    }
+  
+    isEmpty() {
+        return this.head === null;
+    }
+  
+    addItem(key, value) {  
+        const temp = new LinkedListNode(key, value);
+  
+        if (!this.head) {
+            this.head = temp;
+            this.tail = temp;
+        } else {
+            this.tail.next = temp;
+            this.tail = temp;
+        };
+  
+        this.map.set(key, temp);
+    }
+  
+    each(cb) {
+        if (this.isEmpty()) return;
+    
+        let current = this.head;
+        while (current) {
+            cb(current.key, current.value);
+            
+            current = current.next;
+        };
+    }
+
+    clearEach(cb) {
+        if (this.isEmpty()) return;
+    
+        let current = this.head;
+        while (current) {
+            cb(current.key, current.value);
+            
+            current = current.next;
+        };
+
+        this.head = null;
+        this.tail = null;
+      
+        this.map.clear();
+    }
+};
+
+module.exports = LinkedList;