Create 2296-design-a-text-editor.js

Author: everthis

2296-design-a-text-editor.js

@@ -0,0 +1,73 @@
+class Node {
+  constructor(val) {
+    this.val = val
+    this.prev = null
+    this.next = null
+  }
+}
+
+var TextEditor = function() {
+ this.left = []
+ this.right = []
+ this.idx = 0
+};
+
+/** 
+ * @param {string} text
+ * @return {void}
+ */
+TextEditor.prototype.addText = function(text) {
+ for(const ch of text) this.left.push(ch)
+};
+
+/** 
+ * @param {number} k
+ * @return {number}
+ */
+TextEditor.prototype.deleteText = function(k) {
+  let res = 0
+  while(this.left.length && k) {
+    res++
+    this.left.pop()
+    k--
+  }
+  return res
+};
+
+/** 
+ * @param {number} k
+ * @return {string}
+ */
+TextEditor.prototype.cursorLeft = function(k) {
+  while(k && this.left.length) {
+  const tmp = this.left.pop()
+  this.right.push(tmp)
+    k--
+  }
+
+  return this.left.slice(Math.max(0, this.left.length - 10), this.left.length).join('')
+};
+
+/** 
+ * @param {number} k
+ * @return {string}
+ */
+TextEditor.prototype.cursorRight = function(k) {
+  while(k && this.right.length) {
+  const tmp = this.right.pop()
+  this.left.push(tmp)  
+    k--
+  }
+
+  return this.left.slice(Math.max(0, this.left.length - 10), this.left.length).join('')
+};
+
+
+/** 
+ * Your TextEditor object will be instantiated and called as such:
+ * var obj = new TextEditor()
+ * obj.addText(text)
+ * var param_2 = obj.deleteText(k)
+ * var param_3 = obj.cursorLeft(k)
+ * var param_4 = obj.cursorRight(k)
+ */