TechXR Innovations Junior Software Developer Interview Questions and Answers

useEffect is a hook in React that allows you to perform side effects in functional components.

• useEffect is used to manage component lifecycle in functional components.

• It takes two arguments: a function that performs the side effect and an array of dependencies.

• The function passed to useEffect is called after every render.

• The array of dependencies is used to determine when the effect should be re-run.

• If the array is emp...read more

A promise is an object representing the eventual completion or failure of an asynchronous operation.

• Promises are used to handle asynchronous operations such as fetching data from a server.

• They provide a cleaner alternative to callbacks.

• Promises have three states: pending, fulfilled, and rejected.

• They can be chained together using .then() and .catch() methods.

• Promises can also be used with async/await syntax.

Strict mode is a way to write secure and optimized JavaScript code.

• Enables modern JavaScript features

• Prevents the use of undeclared variables

• Throws errors for unsafe actions

• Makes code more optimized for performance

useEffect is a hook in React that allows you to perform side effects in functional components.

• useEffect is used to manage component lifecycle in functional components.

• It takes two arguments: a function that performs the side effect and an array of dependencies.

• The function passed to useEffect is called after every render.

• The array of dependencies is used to determine when the effect should be re-run.

• If the array is emp...read more

A promise is an object representing the eventual completion or failure of an asynchronous operation.

• Promises are used to handle asynchronous operations such as fetching data from a server.

• They provide a cleaner alternative to callbacks.

• Promises have three states: pending, fulfilled, and rejected.

• They can be chained together using .then() and .catch() methods.

• Promises can also be used with async/await syntax.

Strict mode is a way to write secure and optimized JavaScript code.

• Enables modern JavaScript features

• Prevents the use of undeclared variables

• Throws errors for unsafe actions

• Makes code more optimized for performance