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Tidalwave Solutions
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I applied via LinkedIn and was interviewed in Jun 2024. There were 3 interview rounds.
Real DOM updates the entire tree when a change is made, while Virtual DOM updates only the specific elements that have changed.
Real DOM updates are slower compared to Virtual DOM updates.
Virtual DOM helps in improving performance by reducing the number of updates needed.
Virtual DOM is a lightweight copy of the Real DOM, which is used to minimize direct interaction with the Real DOM.
Improving browser performance can be achieved through various techniques and optimizations.
Optimize images and videos to reduce file sizes
Minify and compress CSS, JavaScript, and HTML files
Utilize browser caching to reduce loading times
Reduce the number of HTTP requests by combining files
Use asynchronous loading for scripts and stylesheets
A diffing algorithm compares two sets of data to identify the differences between them.
Use algorithms like LCS (Longest Common Subsequence) or Myers diff algorithm for efficient comparison.
Consider factors like time complexity and space complexity when choosing a diffing algorithm.
Implementing a visual diff tool can help users easily see the changes between two versions of a file.
useMemo is used to memoize a value, while useCallback is used to memoize a function.
useMemo is used to memoize a value and recompute it only when its dependencies change.
useCallback is used to memoize a function and recompute it only when its dependencies change.
useMemo is useful for optimizing performance by avoiding unnecessary re-renders.
useCallback is useful for optimizing performance by avoiding unnecessary functi...
Improving backend performance involves optimizing code, database queries, and server configurations.
Optimize database queries by using indexes, avoiding unnecessary joins, and caching results.
Use caching mechanisms like Redis or Memcached to store frequently accessed data.
Implement asynchronous processing for time-consuming tasks to improve response times.
Scale horizontally by adding more servers or using load balancer...
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The program capitalizes the first letter of each reversed word in a sentence.
Split the sentence into an array of words using space as a delimiter.
Reverse each word in the array and capitalize the first letter.
Join the modified words back into a sentence.
I appeared for an interview before Oct 2023.
It was based on frontend technologies
I applied via LinkedIn and was interviewed before Apr 2023. There was 1 interview round.
I applied via Campus Placement and was interviewed in Aug 2023. There was 1 interview round.
A process is an instance of a program while a thread is a subset of a process that can run concurrently with other threads.
Processes have their own memory space while threads share the same memory space within a process.
Processes are independent of each other while threads within the same process can communicate with each other.
Processes are heavier in terms of resource consumption compared to threads.
Example: A web br...
Api related questions
Indexing in MySQL is a technique to improve the performance of database queries by creating a data structure that allows for faster data retrieval.
Indexes are created on one or more columns of a table.
They help in speeding up the search, sorting, and joining of data.
Indexes can be created using different algorithms like B-tree, hash, or bitmap.
Using indexes appropriately can significantly enhance query performance.
Exam...
Object-oriented programming concepts in PHP
Encapsulation: bundling data and methods together in a class
Inheritance: creating new classes based on existing ones
Polymorphism: using a single interface to represent different types
Abstraction: hiding unnecessary details and exposing only essential features
Class: blueprint for creating objects
Object: instance of a class
Method: function defined inside a class
Property: variabl
Algorithms for manipulating arrays and strings in coding
Use sorting algorithms like quicksort and mergesort for arrays
Use string manipulation functions like substring and replace for strings
Use dynamic programming for optimizing solutions to array and string problems
Designing a large scale Ad Server
Use distributed systems for scalability
Implement caching for faster ad delivery
Ensure high availability and fault tolerance
Use real-time bidding for efficient ad placement
Implement fraud detection mechanisms
Ensure compliance with privacy regulations
I applied via Campus Placement
I am an avid traveler and have visited over 20 countries
I love experiencing new cultures and trying new foods
I have backpacked through Europe and Asia
I have volunteered in orphanages in Cambodia and Nepal
Mobile advertising platform
Adtech
Mobile marketing
App monetization
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