AMPLUS SOLAR Senior Engineer Interview Questions and Answers

Q1. Asked to write a program to check whether string is valid or not. String consists of only three kind of special characters "(), [], {}". We need to return true if all special characters are in correct for...read more
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Q2. What is useRef hook used for?
Ans. 
useRef hook is used to persist a mutable value across renders without causing a re-render.
• Used to store mutable values that do not trigger re-renders.

• Commonly used for accessing DOM elements or storing previous values.

• Does not cause a re-render when the value changes.
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Q3. What are the best practices to avoid rerenders and to improve performance
Ans. 
Use memoization, virtual DOM, and shouldComponentUpdate to avoid unnecessary rerenders and improve performance.
• Implement memoization to store the result of expensive function calls and avoid recalculating them.

• Use virtual DOM to efficiently update only the parts of the UI that have changed.

• Override shouldComponentUpdate to prevent unnecessary rerenders by comparing current and next props/state.
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Q4. What are callbacks, Promises, async await
Ans. 
Callbacks, Promises, async await are asynchronous programming concepts in JavaScript.
• Callbacks are functions passed as arguments to another function to be executed later.

• Promises are objects representing the eventual completion or failure of an asynchronous operation.

• async await is a syntax for writing asynchronous code that looks synchronous, making it easier to read and maintain.

• Example: Using a callback to handle th...read more
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Q1. What is string eplain that code
Ans. 
A string is a sequence of characters used to represent text.
• Strings are typically enclosed in quotation marks

• Strings can contain letters, numbers, symbols, and spaces

• Strings can be manipulated using various string functions
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Q2. What is array how type of array
Ans. 
An array is a data structure that stores a collection of elements of the same type in a contiguous memory location.
• Arrays can be of different types such as integer arrays, float arrays, or string arrays.

• Example: string[] names = {"Alice", "Bob", "Charlie"};

• Arrays in most programming languages are zero-indexed, meaning the first element is at index 0.

• Arrays allow for efficient access and manipulation of elements based o
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Very few question asking like time and work

Q1. Python functions
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Q2. Join on multiple tables
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Q1. Nth Greatest Element III (Leetcode)
Ans. 
Find the Nth greatest element in an array without sorting
• Use a priority queue to keep track of the N greatest elements

• Iterate through the array and add elements to the priority queue

• Return the top element from the priority queue as the Nth greatest element
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Q2. Heater Problem (Leetcode)
Ans. 
Heater Problem - Find minimum radius to cover all houses with heaters
• Sort the houses and heaters arrays

• For each house, find the closest heater using binary search

• Calculate the minimum radius needed to cover all houses
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Q2. Sdfsdfsdfsdfsdfdfsfsdfssssadfsdfsdfasdfasdfdsfasd
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2 hours coding round, only 1 person out of 90 cleared

Q1. Asked loads of dsa, super technical questions
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1 hr, there were some DSA problems

1 hr, there were some DSA problems

Q1. Any hard situation u faced ?
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Q2. How you tackled hard situation
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Q1. About Cloud Services
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Q2. AWS - SNS/SQS/Lambda etc
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