Qualys Front end Engineer Interview Questions and Answers

Q1. Front End technical questions
Add your answer

Q1. React component life cycle.
Add your answer
Q2. Redux, React Hooks, State, Props.
Add your answer

Q1. Basics about angular
Add your answer
Q2. Javascript concepts
Add your answer

Q1. Javascript question
Add your answer

Aptitude round will for 30 min .

Simple programming test

Q1. Angular basics regarding lifecycle hooks, rxjs, data bindingetc
Add your answer
Q2. Coding to find the common characters comparing 3 strings
Ans. 
Finding common characters in 3 strings using coding
• Create a function that takes in 3 strings as input

• Iterate through each character of the first string and check if it exists in the other 2 strings

• Store the common characters in an array and return it
Answered by AI
Add your answer

Q1. Var,let and const differences
Ans. 
var, let, and const are all used for variable declaration in JavaScript, but they have different scopes and behaviors.
• var is function scoped, let and const are block scoped

• var can be redeclared and updated, let can be updated but not redeclared, const cannot be redeclared or updated

• const is used for variables that should not be reassigned, like constants
Answered by AI
Add your answer
Q2. What is a promise? in javascript
Ans. 
A promise in JavaScript represents the eventual completion (or failure) of an asynchronous operation and its resulting value.
• Promises are objects that represent the eventual completion (or failure) of an asynchronous operation.

• They can be in one of three states: pending, fulfilled, or rejected.

• Promises can be chained using .then() to handle success and failure.

• Example: new Promise((resolve, reject) => { ... }).then(res
Answered by AI
Add your answer