Telstra Technologies India Private Limited Interview Questions and Answers

For loop is used for iterating over a range of values while for each loop is used for iterating over elements of an array.

• For loop is used when the number of iterations is known beforehand.

• For each loop is used when the number of iterations is not known beforehand.

• For loop can be used with any iterable object.

• For each loop can only be used with arrays and other iterable objects.

• For loop uses an index variable to access...read more

Check if a number is prime and optimize the code.

• Start by checking if the number is less than 2, in which case it is not prime.

• Iterate from 2 to the square root of the number and check if any of them divide the number evenly.

• If a divisor is found, the number is not prime. Otherwise, it is prime.

To optimise API calls in React, use asynchronous functions and caching techniques.

• Use async/await to handle API calls

• Implement caching to reduce network requests

• Use memoization to avoid unnecessary re-renders

• Consider using a state management library like Redux

• Use performance profiling tools like React DevTools