In JavaScript, hoisting is a behavior where variable and function declarations are moved to the top of their containing scope during the execution phase. This allows you to access variables and functions even before they are declared in the code. Hoi...
Everything in JavaScript happens inside an execution context. An execution context is like a big box that contains all the types of code in JavaScript. The execution context is divided into two parts: Memory Code In the memory part, JavaScript st...
Block Referring to is grouping multiple statements together inside a block (curly braces {}) in JavaScript. This is often done when JavaScript expects a single statement but you want to execute multiple statements in that context Example: if (true) {...
In React 18 When a user wants to change their name, the process typically involves typing the new name into an input box and then clicking the submit button (which triggers an API call). After submitting, we receive a response. In this case, we need ...
Before promises, we handled asynchronous operations using callback functions, but callbacks are not a good way to handle asynchronous operations. Callbacks: Callback functions are passed as arguments to asynchronous functions(fetchData) and are exec...
Before the async/await keywords, we handled promises like this: const p = new Promise((resolve, reject) => resolve("resolved promise")); p.then((res) => { console.log(res); }); console.log("hello"); JavaScript doesn't "suspend" execution when ha...