Frontend

Why do we use functional state updates (passing a function to setState with the argument prev) instead of just count + 1?

What are the disadvantages of Virtual DOM?

What prompted you to start looking for a new job?

What is the purpose of useState and why can't we just change a variable directly or use useRef?

Tell about your work experience, projects, and technologies used.

What are state managers used for and how do they differ from using Context?

What principles do you follow when designing architecture and choosing technologies?

How to understand when to apply optimizations? Have you ever had cases where you needed to solve performance issues?

What are you looking for in a new job, what do you pay attention to?

Implement an event manager that accepts events in arbitrary order and sends them in the correct order by ID (starting from 1, each next one is 1 greater). Events can come from multiple channels, and order must be maintained within each channel separately. Ignore duplicate events. Use the sendEvent function for sending.

Practical task: improve the React counter component so that when clicking the 'Increase' button, the counter value increases by 1 and a record of the increase with the new value is added to the history; when clicking 'Decrease' — similarly; when clicking 'Reset' — the history is cleared.

How have you applied state managers in terms of architecture and usage practices?

Implement a function smartFetch, which is a wrapper over batchFetch for data requests from the backend by ID. The function should accumulate calls within a time window (timeout) and send them as a single batch request. The wait for the next window starts immediately after sending the request. IDs are unique, fetch is always successful. Properly handle the case when duplicate IDs arrive within the same window.

Task: Create a webpage with a multifunctional cryptocurrency table. Connect to an API and display a list of coins in the table. Minimum requirements: Project created from scratch Only Typescript Connect to API Sort by column values Search by cell values (works on a logical AND principle) Additional tasks: Custom pagination Minimal styles (pleasant and neat appearance) Global search across all cell values Ability to pin columns

What are the ways to optimize performance in React?

What technology underpins React and what is it used for?