Athenahealth Technology Software Engineer Intern Interview Questions and Answers

Q1. What fifo? diff btwn fifo and lifo
Ans. 
FIFO stands for First In, First Out. LIFO stands for Last In, First Out.
• FIFO is a method for organizing and manipulating a data buffer, where the first element added is the first to be removed.

• LIFO is a method where the last element added is the first to be removed.

• FIFO is like a queue, while LIFO is like a stack.

• Example: In a FIFO queue, if elements A, B, and C are added in that order, they will be removed in the same...read more
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First round was on Hacker Earth

Q1. Technical round was on Spring Data Jpa, Pagination, SOLID principles
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Q1. Uikit explaination
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Q2. Model classes with uikit
Ans. 
Model classes in UIKit are used to represent data in an application's user interface.
• Model classes in UIKit typically subclass NSObject and are used to store and manage data for views.

• They can include properties to represent different data fields, methods to manipulate the data, and sometimes protocols for delegation.

• For example, a model class for a user profile in a social media app might have properties like username...read more
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Project related questions

Q1. Js questions and 2 coding questions
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Q2. Questions on angular, html and css
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Q1. What is a bloom filter in hbase ?
Ans. 
A bloom filter in HBase is a data structure used to test whether a given element is a member of a set.
• Bloom filters are used to reduce the number of disk reads in HBase by quickly determining if a row may exist in a table.

• They are implemented as a compact array of bits, with multiple hash functions used to map elements to bits.

• Bloom filters can produce false positives but not false negatives, making them useful for pre...read more
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Q2. Write a query to remove duplicate rows in pyspark based on primary key.
Ans. 
Use dropDuplicates() function in pyspark to remove duplicate rows based on primary key.
• Use dropDuplicates() function on the DataFrame with the primary key column specified.

• Specify the subset parameter in dropDuplicates() to specify the primary key column.

• Example: df.dropDuplicates(['primary_key_column'])
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Q1. How is GIL and how python handle multi threading
Ans. 
GIL stands for Global Interpreter Lock in Python, which limits execution of multiple threads at once.
• GIL is a mutex that protects access to Python objects, preventing multiple threads from executing Python bytecodes at once.

• Due to GIL, Python threads are not suitable for CPU-bound tasks but are still useful for I/O-bound tasks.

• To handle multi-threading in Python, one can use multiprocessing module or asynchronous progr...read more
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Q2. Explain How React works under the hood.
Ans. 
React uses a virtual DOM to efficiently update the actual DOM based on changes in state or props.
• React creates a virtual DOM representation of the actual DOM.

• When state or props change, React compares the virtual DOM with the actual DOM to determine the minimal set of changes needed.

• React then updates the actual DOM efficiently to reflect the changes.
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Q1. Basics of sql and some coding questions
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Q2. Data structures
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Q1. Putin arrays strings
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Q1. Self Introduction
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