solution

Author: Drago

01-js/hard/calculator.js

@@ -16,6 +16,59 @@
   Once you've implemented the logic, test your code by running
 */
 
-class Calculator {}
- 
+class Calculator {
+  constructor() {
+    this.result = 0;
+  }
+
+  add(number) {
+    if (typeof number !== 'number') {
+      throw new Error('Invalid input. Please provide a number.');
+    }
+    this.result += number;
+  }
+
+  subtract(number) {
+    if (typeof number !== 'number') {
+      throw new Error('Invalid input. Please provide a number.');
+    }
+    this.result -= number;
+  }
+
+  multiply(number) {
+    if (typeof number !== 'number') {
+      throw new Error('Invalid input. Please provide a number.');
+    }
+    this.result *= number;
+  }
+
+  divide(number) {
+    if (typeof number !== 'number') {
+      throw new Error('Invalid input. Please provide a number.');
+    }
+    if (number === 0) {
+      throw new Error(Error);
+    }
+    this.result /= number;
+  }
+
+  clear() {
+    this.result = 0;
+  }
+
+  getResult() {
+    return this.result;
+  }
+
+  calculate(expression) {
+    const sanitizedExpression = expression.replace(/\s+/g, ''); // Remove all spaces
+    const result = eval(sanitizedExpression); // Evaluate the expression
+    if (isNaN(result)) {
+      throw new Error('Invalid expression. Please provide a valid arithmetic expression.');
+    }
+    this.result = result;
+  }
+}
+
+// FILEPATH: /c:/Users/abrar/OneDrive/Desktop/100xDevops/assignments/01-js/hard/calculator.js
 module.exports = Calculator;

01-js/hard/todo-list.js

@@ -11,6 +11,40 @@
 */
 
 class Todo {
+  constructor(){
+    this.todos = [];
+  }
+
+  add(str){
+    this.todos.push(str);
+  }
+  remove(indexOfTodo){
+    this.todos.splice(indexOfTodo,1);
+  }
+  update(index, updatedTodo){
+    if(index<this.todos.length){
+      this.todos[index]=updatedTodo;
+
+  }
+  }
+  getAll(){
+    return this.todos;
+  }
+
+  get(indexOfTodo){
+    if(indexOfTodo<this.todos.length){
+    return this.todos[indexOfTodo];
+    }
+    else return null;
+
+  }
+
+  clear(){
+    this.todos=[]
+  }
+  
+
+
 
 }