--- title: "Kirti Singh (@kirtisingh14) | Hashnode" description: "I am Software Tester and on path to became a web developer. Read the latest articles by Kirti Singh on Hashnode." url: "https://hashnode.com/@kirtisingh14" --- @kirtisingh14 # Kirti Singh @kirtisingh14 · India · Joined September 2022 I am Software Tester and on path to became a web developer ### [Understanding JavaScript Variable Declarations: The Journey from var to let and const](https://kirti-singh.hashnode.dev/understanding-javascript-variable-declarations-the-journey-from-var-to-let-and-const?utm_source=hashnode&utm_medium=feed) Unlocking the Potential: A Comprehensive Guide to JavaScript Variable Declarations 3 min read · [kirti-singh.hashnode.dev](https://kirti-singh.hashnode.dev/understanding-javascript-variable-declarations-the-journey-from-var-to-let-and-const?utm_source=hashnode&utm_medium=feed) [Apr 7, 2024](https://hashnode.com/posts/understanding-javascript-variable-declarations-the-journey-from-var-to-let-and-const/6612f6f291e3f8b8c92f1cc6) ### [Asynchronous JavaScript: Callback, Promise, and Async/Await](https://kirti-singh.hashnode.dev/asynchronous-javascript-callback-promise-and-asyncawait?utm_source=hashnode&utm_medium=feed) Asynchronous JavaScript: Callback, Promise, and Async/Await 5 min read · [kirti-singh.hashnode.dev](https://kirti-singh.hashnode.dev/asynchronous-javascript-callback-promise-and-asyncawait?utm_source=hashnode&utm_medium=feed) [3](https://hashnode.com/posts/asynchronous-javascript-callback-promise-and-asyncawait/641628f771e26c4e32bce94c) [Mar 18, 2023](https://hashnode.com/posts/asynchronous-javascript-callback-promise-and-asyncawait/641628f771e26c4e32bce94c) ### [The Nullish Coalescing Operator (??)](https://kirti-singh.hashnode.dev/the-nullish-coalescing-operator?utm_source=hashnode&utm_medium=feed) Nullish coalescing operator returns the right side operand when the left side operand is Nullish. Likewise left side, an operand is returned when the right side operand is Nullish. Often used to provide a default value if the first one is missing. Um... 1 min read · [kirti-singh.hashnode.dev](https://kirti-singh.hashnode.dev/the-nullish-coalescing-operator?utm_source=hashnode&utm_medium=feed) [Feb 24, 2023](https://hashnode.com/posts/the-nullish-coalescing-operator/63f8ea14dae748cc4ed0a8e5) ### [Arrow Function in JavaScript](https://kirti-singh.hashnode.dev/arrow-function-in-javascript?utm_source=hashnode&utm_medium=feed) The arrow function is introduced in ES6 which is a more straightforward form of the traditional function we used. While both functions work in the same manner.Example of arrow function: const arrowFunction = () => 'This is Arrow Function'; arrowFunct... 2 min read · [kirti-singh.hashnode.dev](https://kirti-singh.hashnode.dev/arrow-function-in-javascript?utm_source=hashnode&utm_medium=feed) [Feb 12, 2023](https://hashnode.com/posts/arrow-function-in-javascript/63e8ceaaa701d648beb206da)