WebMobi Web Developer Interview Questions and Answers

useState is used to manage state in functional components in React.

• useState is a hook provided by React.

• It allows functional components to have state.

• It takes an initial value and returns an array with two elements: the current state value and a function to update it.

• useState can be used multiple times in a single component to manage different pieces of state.

let, var, and const are used to declare variables with different scopes and mutability.

• let has block scope and can be reassigned

• var has function scope and can be reassigned

• const has block scope and cannot be reassigned

• let and const are both block-scoped, meaning they are only accessible within the block they are declared in

• var is function-scoped, meaning it is accessible within the function it is declared in