Walmart Labs Software Engineer III Interview Questions and Answers

Q1. Array based question
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Q2. DP based question
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Q1. Internal implementation of HashMap
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HashMap is implemented using an array of linked lists to store key-value pairs.
• HashMap consists of an array of buckets, each containing a linked list of key-value pairs.

• Hashing function is used to determine the index of the bucket where a key-value pair will be stored.

• Collision resolution techniques like chaining or open addressing are used to handle collisions.

• HashMap allows null keys and values, but only one null key...read more
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Q2. In depth javascript concepts
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Q1. Project based discussion
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Q2. Design for a date picker in javascript
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A date picker in JavaScript allows users to select a date from a calendar interface.
• Use HTML input element with type 'date' for modern browsers

• For older browsers, use a JavaScript library like jQuery UI Datepicker

• Implement validation to ensure selected date is within acceptable range
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Q1. Implement Stack using Queue.
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Implement a stack using a queue data structure.
• Use two queues to simulate a stack.

• Push operation: Enqueue the element to queue 1.

• Pop operation: Dequeue all elements from queue 1 to queue 2, dequeue the last element from queue 2.

• Top operation: Return the front element of queue 1.

• Empty operation: Check if both queues are empty.
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Q2. Use two thread two print From 1 to 10 where Thread A will be for odd and Thread B will be for even.
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Use two threads to print numbers 1 to 10, with Thread A printing odd numbers and Thread B printing even numbers.
• Create two threads, one for odd numbers and one for even numbers

• Use a shared variable to keep track of the current number being printed

• Use synchronization mechanisms like mutex or semaphore to ensure proper sequencing of numbers
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Q1. What are the basics of JavaScript and ES6 modules?
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JavaScript is a popular programming language used for web development. ES6 modules are a way to organize and reuse code in JavaScript.
• JavaScript is a high-level, interpreted programming language commonly used for client-side web development.

• ES6 modules allow developers to split their code into separate files and import/export functions, variables, and classes between them.

• ES6 introduced 'import' and 'export' keywords f...read more
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Provide additional information regarding CSS, HTML coding, and the coding scenario in React.

Q1. What are the key components of frontend system design?
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Key components of frontend system design include user interface, data management, state management, and performance optimization.
• User Interface: Designing the layout, navigation, and visual elements of the frontend.

• Data Management: Handling data fetching, storage, and manipulation within the frontend.

• State Management: Managing the state of the application to ensure data consistency and reactivity.

• Performance Optimizati...read more
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Q1. What projects have you worked on, and can you discuss your contributions to them?
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I have worked on various projects including a mobile app for tracking fitness goals and a web application for managing inventory.
• Developed a mobile app using React Native to track fitness goals and provide workout plans.

• Contributed to a web application built with Angular for managing inventory and tracking sales.

• Implemented RESTful APIs for communication between front-end and back-end systems.

• Collaborated with cross-fu...read more
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Q1. Salary discussion and personal discussion
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Q1. Sort 0 1 2 array binary tree left view
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Sort an array of 0s, 1s, and 2s and find the left view of a binary tree.
• To sort the array of 0s, 1s, and 2s, you can use the Dutch National Flag algorithm which sorts the array in a single pass.

• To find the left view of a binary tree, perform a level order traversal and keep track of the first node at each level.
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Q1. Questions on java garbage collector
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Q1. Manager and behavioral round
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