Kewill Interview Questions and Answers

GraphQL is a query language for APIs and a runtime for executing those queries. REST API is a set of rules for building web services. Both have their own advantages.

• GraphQL allows clients to request only the data they need, reducing over-fetching and under-fetching.

• REST API follows a more rigid structure and is easier to understand for beginners.

• GraphQL is more efficient for complex queries involving multiple resources.

• REST API is better suited for simple, stateless interacti...read more

Calculate the sum of prime numbers.

• Iterate through numbers and check if each number is prime

• If a number is prime, add it to the sum

• Return the sum of prime numbers

Closure in JavaScript is a function that has access to its own scope, as well as the outer scope in which it was defined.

• A closure allows a function to access variables from its outer function even after the outer function has finished executing.

• Closures are commonly used in event handlers, callbacks, and in functional programming.

• Example: function outerFunction() { let outerVar = 'I am outer'; return function innerFunction() { console.log(outerVar); }; }

Class is used to style multiple elements, while ID is used to style a single element.

• Class can be used multiple times in a document, while ID should be unique

• Class is denoted by a period (.), ID is denoted by a hash (#)

• Class can be applied to multiple elements, ID can only be applied to one element

Yes, I have prior experience with Javascript.

• I have worked on various projects using Javascript.

• I am familiar with popular Javascript libraries and frameworks like React and Node.js.

• I have experience in writing clean and efficient Javascript code.

• I have used Javascript for both front-end and back-end development.