Nielsen Software Developer Interview Questions and Answers

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. 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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Aptitude Test + Technical Questions + One Coding Question

Q1. Detect the loop in a Singly linked list
Ans. 
Detect loop in a singly linked list
• Use two pointers, one moving one step at a time and the other moving two steps at a time

• If there is a loop, the two pointers will eventually meet

• If any of the pointers reach the end of the list, there is no loop
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Q2. 2 Sum (find a pair of numbers that sums up to a target)
Ans. 
The 2 Sum problem involves finding a pair of numbers in an array that adds up to a given target.
• Use a hash table to store the complement of each number as you iterate through the array.

• Check if the current number's complement exists in the hash table.

• If found, return the indices of the two numbers.

• If no pair is found, return an empty array.
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