Design a Text Editor problem solved

Author: hasibulislam999

Doubly-Linked List/2296_design-a-text-editor.js

@@ -0,0 +1,57 @@
+/**
+ * Title: Design a Text Editor
+ * Description: Design a text editor with a cursor that can do the following: Add text to where the cursor is. Delete text from where the cursor is (simulating the backspace key). Move the cursor either left or right.
+ * Author: Hasibul Islam
+ * Date: 06/04/2023
+ */
+
+var TextEditor = function () {
+  this.leftText = "";
+  this.rightText = "";
+};
+
+/**
+ * @param {string} text
+ * @return {void}
+ */
+TextEditor.prototype.addText = function (text) {
+  this.leftText += text;
+};
+
+/**
+ * @param {number} k
+ * @return {number}
+ */
+TextEditor.prototype.deleteText = function (k) {
+  if (k > this.leftText.length) k = this.leftText.length;
+  this.leftText = this.leftText.substr(0, this.leftText.length - k);
+  return k;
+};
+
+/**
+ * @param {number} k
+ * @return {string}
+ */
+TextEditor.prototype.cursorLeft = function (k) {
+  if (this.leftText.length < k) k = this.leftText.length;
+  let temp = this.leftText.substr(this.leftText.length - k);
+  this.leftText = this.leftText.substr(0, this.leftText.length - k);
+  this.rightText = temp + this.rightText;
+  return this.leftText.substr(
+    this.leftText.length - Math.min(this.leftText.length, 10)
+  );
+};
+
+/**
+ * @param {number} k
+ * @return {string}
+ */
+TextEditor.prototype.cursorRight = function (k) {
+  if (this.rightText.length < k) k = this.rightText.length;
+  let temp = this.rightText.substr(0, k);
+  this.rightText = this.rightText.substr(k);
+  this.leftText = this.leftText + temp;
+  return this.leftText.substr(
+    this.leftText.length - Math.min(this.leftText.length, 10)
+  );
+};