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Articles tagged with #frontend
Scope: Scope refers to the context or environment in which a variable is declared and can be accessed. A variable’s scope defines where it can be used and where it is accessible. There are two type of scope : Local scope and 2. Global scope For exa...
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...
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...
1. Basics of JavaScript variables: var, let, and const var: Function-scoped. Can be redeclared and updated. Example: var x = 10; var x = 20; // This is allowed console.log(x); // 20 let: Block-scoped. Can be updated, but not re-decl...