10+ Senior Frontend Software Engineer Interview Questions and Answers

Memoization is a technique to optimize function calls by caching their results.

• Memoization is used to store the results of expensive function calls and return the cached result when the same inputs occur again.

• It improves performance by avoiding redundant computations.

• Fibonacci sequence is a classic example to demonstrate memoization.

• Memoization can be implemented using an object or an array to store the cached results.

To center align a square and circle inside a rectangle, calculate the center point of the rectangle and position the shapes accordingly.

• Calculate the center point of the rectangle using its width and height

• Position the square and circle by subtracting half of their width/height from the center point

• Use CSS to set the position of the shapes

Program to check duplicate numbers in a phone number

• Convert phone number to an array of strings

• Loop through the array and check for duplicates

• Use a hash table to keep track of numbers already seen

Seeking new challenges and growth opportunities in a different environment.

• Looking for new challenges and opportunities to grow professionally

• Interested in working with new technologies and tools

• Seeking a more collaborative team environment

• Want to expand my skill set and knowledge in frontend development

Custom implementation of array flat method

• Create a function that takes an array as input

• Iterate through each element of the array

• If an element is an array, recursively call the function on that element

• If an element is a string, add it to the result array

• Return the result array

Create Microsoft Teams call UI using HTML and CSS.

• Use HTML to structure the layout of the call UI

• Use CSS to style the elements such as buttons, video feeds, and chat box

• Implement responsive design for different screen sizes

• Include features like mute/unmute, video on/off, screen sharing, and chat functionality

Design a library to log drop-rate in form fields.

• Create a function to track changes in form fields

• Implement a mechanism to calculate drop-rate based on user interactions

• Store drop-rate data in a database for analysis

Encapsulation in JavaScript is achieved through the use of closures and modules.

• Encapsulation is the practice of keeping variables and functions private within a class or module.

• Closures allow for private variables and functions to be created within a function.

• Modules are self-contained units of code that can be imported and used in other parts of the application.

• The revealing module pattern is a common way to implement encapsulation in JavaScript.

Vendor prefixes are used in CSS to add experimental features that are not yet standardized.

• Vendor prefixes are added to CSS properties to support experimental features.

• They are used to test new features before they are standardized.

• Examples of vendor prefixes include -webkit-, -moz-, -ms-, and -o-.

• Vendor prefixes should be used sparingly and with caution, as they can cause compatibility issues.

• It is important to include the standard version of the property after the vendor-pr...read more

PUB SUB pattern is a messaging pattern where senders of messages (publishers) do not program the messages to be sent directly to specific receivers (subscribers).

• Publishers send messages without knowing who the subscribers are

• Subscribers receive messages without knowing who the publishers are

• Commonly used in event-driven systems to decouple components

I am currently working on a project to redesign the user interface of a web application for better user experience.

• Implementing responsive design for mobile compatibility

• Optimizing performance by reducing page load times

• Enhancing accessibility features for users with disabilities