Walmart Software Engineer III Interview Questions, Process, and Tips

Q1. Given a tree and a node, print all ancestors of Node
Ans. 
Given a tree and a node, print all ancestors of Node
• Start from the given node and traverse up the tree

• While traversing, keep track of the parent nodes

• Print the parent nodes as you traverse up until reaching the root
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Q2. What would be the ideal data structure to represent people and friend relations in facebook
Ans. 
Graph
• Use a graph data structure to represent people as nodes and friend relations as edges

• Each person can be represented as a node with their unique identifier

• Friend relations can be represented as directed edges between nodes

• This allows for efficient traversal and retrieval of friend connections
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Q3. Reverse a linked list
Ans. 
Reverse a linked list
• Iterate through the linked list and change the direction of the pointers

• Use three pointers to keep track of the previous, current, and next nodes

• Recursively reverse the linked list
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Q1. Code to determine the median of datapoints present in two sorted arrays. Most efficient algo
Ans. 
Code to find median of datapoints in two sorted arrays
• Use binary search to find the median index

• Divide the arrays into two halves based on the median index

• Compare the middle elements of the two halves to determine the median
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Q1. Discussion about projects, and previous experience
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Q2. Custom implementation of stack where there are two additional methods that return the min and max of the elements in the stack
Ans. 
Custom stack with methods to return min and max elements
• Implement a stack using an array or linked list

• Track the minimum and maximum elements using additional variables

• Update the minimum and maximum variables during push and pop operations

• Implement methods to return the minimum and maximum elements
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Q1. Explain useState for managing state, useEffect for handling side effects, useMemo for performance optimization, and useCallback for memoizing functions. Understand how these hooks enhance functional compon...read more
Ans. 
Explanation of useState, useEffect, useMemo, and useCallback hooks in React functional components.
• useState is used to manage state in functional components

• useEffect is used for handling side effects like data fetching, subscriptions, etc.

• useMemo is used for performance optimization by memoizing expensive calculations

• useCallback is used for memoizing functions to prevent unnecessary re-renders

• These hooks enhance functio...read more
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Q2. Describe lifecycle methods in class components and their functional equivalents with hooks. Know how to handle component mounting, updating, and unmounting.
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Q3. Understand setting up a Redux store, connecting components, and managing actions and reducers. Be familiar with middleware like Redux Thunk or Redux Saga for handling asynchronous actions.
Ans. 
Setting up Redux store, connecting components, managing actions and reducers, and using middleware like Redux Thunk or Redux Saga for handling asynchronous actions.
• Setting up a Redux store involves creating a store with createStore() function from Redux, combining reducers with combineReducers(), and applying middleware like Redux Thunk or Redux Saga.

• Connecting components to the Redux store can be done using the connec...read more
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Q4. How to add and manipulate elements in arrays using JavaScript (e.g., inserting "watermelon" in the middle)?
Ans. 
To add and manipulate elements in arrays using JavaScript, you can use array methods like splice() and slice().
• Use the splice() method to insert elements into an array at a specific index. For example, arr.splice(index, 0, 'watermelon') will insert 'watermelon' at the specified index without removing any elements.

• To manipulate elements in an array, you can use methods like splice() to remove elements or slice() to extr...read more
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Q5. Use and purpose of Math.floor() in JavaScript.
Ans. 
Math.floor() is a method in JavaScript that rounds a number down to the nearest integer.
• Math.floor() returns the largest integer less than or equal to a given number.

• It is commonly used to convert a floating-point number to an integer.

• Example: Math.floor(3.9) returns 3.
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Q6. Mocking components in Jest, including handling props and named exports
Ans. 
Mocking components in Jest for testing with props and named exports
• Use jest.mock() to mock components and their exports

• For handling props, use jest.fn() to create mock functions and pass them as props to the component being tested

• For named exports, use jest.mock() with a second argument to specify the module's exports
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Q1. Print even and odd numbers using two threads simultaneously so it should print in sequence
Ans. 
Use two threads to print even and odd numbers in sequence
• Create two threads, one for printing even numbers and one for printing odd numbers

• Use synchronization mechanisms like mutex or semaphore to ensure numbers are printed in sequence

• Start both threads simultaneously and let them print numbers alternately
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Q1. Core java questions and project discussion
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Q1. Cycle in linked list and behavioral
Ans. 
Detecting cycle in a linked list and discussing behavioral aspects
• Explain how to use Floyd's Tortoise and Hare algorithm to detect a cycle in a linked list

• Discuss the importance of understanding memory management in linked lists to prevent cycles

• Explain the impact of cycles in linked lists on time complexity and space complexity of algorithms
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Q1. Few DSA related questions
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Q2. Mid level SQL questions
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SQL, python, PySpark basic to mid level questions.

Q1. Basic project related questions
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Q2. Some prior experience questions
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