HackerEarth Sdet-I Interview Questions and Answers

Q1. Selenium based question
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Q2. Programming question
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Q1. Everything from core java, questions solve by stream and HashMaps(frequencies of character)
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Q1. More from inheritance and polymorphism, collections, fail fast VS fail safe, scenario based questions, implementations of SQL queries and comparable and comparator
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Q1. Tell me about yourself Core java
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Q2. Automation Api Performance Java
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Questions related to React and nodejs

Q1. Given array: [1,3,4,[6,7,[8,5],9],2] Result array : [1,3,4,6,7,8,5,9,2]
Ans. 
The given array needs to be flattened to a single-level array.
• Iterate through the array elements

• If an element is an array, recursively flatten it

• If an element is not an array, add it to the result array
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Q2. Promise in javascript
Ans. 
Promise is a way to handle asynchronous operations in JavaScript.
• Promises represent a value that may not be available yet.

• They have three states: pending, fulfilled, and rejected.

• Promises can be chained using .then() and .catch() methods.

• They help avoid callback hell and make code more readable.

• Example: new Promise((resolve, reject) => {...})
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Q3. What are array methods in Javascript
Ans. 
Array methods in Javascript are built-in functions that can be used to manipulate arrays.
• Some common array methods are push(), pop(), shift(), unshift(), slice(), splice(), concat(), join(), indexOf(), and forEach().

• push() adds one or more elements to the end of an array.

• pop() removes the last element from an array.

• shift() removes the first element from an array.

• unshift() adds one or more elements to the beginning of a...read more
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Q1. Asked about myself and few javascript concepts.
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Q2. State and props from react
Ans. 
State and props are two important concepts in React for managing data and passing data between components.
• State is used to manage data within a component and can be updated using setState() method.

• Props are used to pass data from parent component to child component.

• State is mutable while props are immutable.

• Example:

• Example:
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