Softogrid Solutions React Js Frontend Developer Interview Questions and Answers

Q1. Explain debouncing
Ans. 
Debouncing is a programming technique used to limit the rate at which a function is executed, especially in response to events.
• Debouncing ensures that a function is not called too frequently, which can improve performance.

• Commonly used in scenarios like window resizing, scrolling, or input field changes.

• Example: In a search input, debouncing can delay the API call until the user stops typing for a specified time.

• It hel...read more
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Q2. What is the event loop in javascript?
Ans. 
The event loop is a fundamental concept in JavaScript that manages asynchronous operations and execution of code.
• JavaScript is single-threaded, meaning it can execute one command at a time.

• The event loop allows JavaScript to perform non-blocking operations by using a call stack and a message queue.

• When an asynchronous operation (like a setTimeout or a network request) is initiated, it is sent to the Web APIs.

• Once the o...read more
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Q3. What are the differences between the call, apply, and bind methods in JavaScript?
Ans. 
call, apply, and bind are methods to set the 'this' context in JavaScript functions, with different invocation styles.
• call: Invokes a function with a specified 'this' value and arguments provided individually. Example: func.call(thisArg, arg1, arg2);

• apply: Similar to call, but arguments are provided as an array. Example: func.apply(thisArg, [arg1, arg2]);

• bind: Returns a new function with a specified 'this' value, allow...read more
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Q4. Array based questions
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Explain the difference between useMemo and useCallback