Data Structures: Remove Elements from a Linked List

Data Structures/linkedListClassRemove.js

@@ -0,0 +1,56 @@
+// https://www.freecodecamp.org/learn/coding-interview-prep/data-structures/remove-elements-from-a-linked-list
+
+function LinkedList() {
+  var length = 0;
+  var head = null;
+
+  var Node = function (element) {
+    this.element = element;
+    this.next = null;
+  };
+
+  this.size = function () {
+    return length;
+  };
+
+  this.head = function () {
+    return head;
+  };
+
+  this.add = function (element) {
+    var node = new Node(element);
+    if (head === null) {
+      head = node;
+    } else {
+      var currentNode = head;
+
+      while (currentNode.next) {
+        currentNode = currentNode.next;
+      }
+
+      currentNode.next = node;
+    }
+
+    length++;
+  };
+
+  this.remove = function (element) {
+    // Only change code below this line
+    let previous = null;
+    let current = head;
+    while (current !== null && current.element !== element) {
+      previous = current;
+      current = current.next;
+    }
+    if (current === null) {
+      return;
+    }
+    if (previous === null) {
+      head = current.next;
+    } else {
+      previous.next = current.next;
+    }
+    length--;
+    // Only change code above this line
+  };
+}