Walmart Software Engineer III Interview Questions and Answers for Experienced

Q1. Implement Hashmap in Java
Ans. 
A HashMap in Java stores key-value pairs for efficient data retrieval using hashing.
• Use an array of buckets to store entries: Each bucket can handle collisions using linked lists.

• Implement methods like put(key, value), get(key), and remove(key).

• Example of put: hashmap.put('key1', 'value1');

• Example of get: String value = hashmap.get('key1');

• Handle resizing when load factor exceeds a threshold (e.g., 0.75).
Answered by AI
Add your answer
Q2. You are given a list of songs, you need to play the songs in shuffle such that no song gets repeated twice until all the songs are played. Do it in O(1) space complexity and O(n) time complete
Add your answer

Q1. Leetcode Cache Question
Add your answer
Q2. Remove Leaf Nodes of Tree
Ans. 
Remove leaf nodes of a tree
• Traverse the tree in postorder fashion

• For each node, check if it is a leaf node (both children are null)

• If it is a leaf node, remove it by setting its parent's reference to null
Answered by AI
Add your answer

Q1. Java Basics Questions
Add your answer
Q2. Design Parking Lot
Ans. 
Design a parking lot system
• Consider the size and layout of the parking lot

• Include features like ticketing system, payment options, and security measures

• Implement a system to track available parking spaces and manage vehicle entry/exit
Answered by AI
Add your answer

Applied for front end engineer

Two sum
Find element in Matrix m*m changed to Find m*n on flow
Adding two linked list

Q1. React js production grade login and dash board
Add your answer
Q2. Flat polly fill
Add your answer
Q3. Lodash get polly fill
Ans. 
Lodash's `get` method retrieves values from objects using a path, with optional default values.
• Lodash's `get` function allows safe access to nested object properties.

• Syntax: `_.get(object, path, [defaultValue])`.

• Example: `_.get({ a: { b: 2 } }, 'a.b')` returns `2`.

• If the path doesn't exist, it returns `undefined` or a specified default value.

• Example: `_.get({ a: { b: 2 } }, 'a.c', 'default')` returns `'default'.
Answered by AI
Add your answer
Q4. Map and filter poly fill
Ans. 
Implementing polyfills for map and filter functions in JavaScript to enhance array manipulation capabilities.
• Polyfill for map: Creates a new array by applying a function to each element. Example: arr.map(x => x * 2).

• Polyfill for filter: Creates a new array with elements that pass a test. Example: arr.filter(x => x > 10).

• Use 'this' context in polyfills to maintain the correct scope. Example: arr.map(function(x)...read more
Answered by AI
Add your answer

Q1. Hiring manager design related questions
Add your answer

Q1. There are 3 technical rounds
Add your answer

Q1. Coding problems, Spring, DSA
Add your answer

Data structures and algorithms, leetcode medium level.

Java with data structures and algorithms round

Q1. Basic hr questions
Add your answer