Staples Software Engineer III Interview Questions and Answers

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
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Q2. Flat polly fill
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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'.
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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
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Q1. Hiring manager design related questions
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Q1. What is memoization, also write polyfill of memoize
Ans. 
Memoization is a technique used in programming to store the results of expensive function calls and return the cached result when the same inputs occur again.
• Memoization helps improve the performance of a function by caching its results.

• It is commonly used in dynamic programming to optimize recursive algorithms.

• Example: Memoizing a Fibonacci function to avoid redundant calculations.
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Q2. What is Promise also write polyfill for Promise
Ans. 
A Promise is an object representing the eventual completion or failure of an asynchronous operation.
• A Promise is used to handle asynchronous operations in JavaScript.

• It represents a value that may be available now, or in the future.

• A polyfill for Promise can be implemented using the setTimeout function to simulate asynchronous behavior.
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DSA - Arrays & String Manipulation

DSA - Tree & Graph Manipulation

Q1. On basis of System design
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Q2. On basis of HLD
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Q1. Question on Behaviour and Values
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Q2. Open ended questions
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Q1. Design a simple page using JS, HTML, and CSS. No frameworks
Ans. 
A simple webpage design using HTML, CSS, and JavaScript to display a greeting message.
• Use HTML to structure the page with a header, main content, and footer.

• Style the page with CSS for layout and design, e.g., using flexbox.

• Add JavaScript to handle user interactions, like a button click to display an alert.
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Q2. What are PropTypes
Ans. 
PropTypes are a way to type-check props in React components to ensure they are passed correctly.
• Used in React to specify the data type of props passed to a component

• Helps catch bugs by providing warnings if incorrect data types are passed

• Can be defined using PropTypes library or as static properties in a component
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Easy qn on stack, array, linked list

Q1. Basic Java questions
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Q1. Design a note taking app
Ans. 
A note taking app that allows users to create, edit, and organize their notes.
• Implement a user interface for creating and editing notes

• Include features like text formatting, image attachments, and voice recordings

• Provide options for organizing notes into folders or categories

• Include search functionality to easily find specific notes

• Implement synchronization across devices for seamless access to notes
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Q1. Managerial round
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Data structures and algorithms, leetcode medium level.

Java with data structures and algorithms round

Q1. Basic hr questions
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Q1. DSA: Trapping Rain Water Leeetcode
Ans. 
Calculate the amount of water that can be trapped between bars after rainfall using heights of bars.
• Use two pointers to traverse the array from both ends towards the center.

• Maintain two variables to track the maximum height from the left and right.

• At each step, calculate trapped water based on the minimum of the two maximum heights.

• Example: For heights [0,1,0,2,1,0,1,3,2,1,2,1], the trapped water is 6.
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Q2. Dynamic Programming Question
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Q1. Java Basics - Stack vs heap memory, Advanced java concepts, Design patterns
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Q2. Spring Boot, JPA, Bean lifecycle, Stereotypes, Multithreading, String pool
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Q1. Resume projects, Caching
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Q2. Kafka
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