10+ Apollo Pharmacy Interview Questions and Answers

Questions related to React JS, optimization techniques, core web vitals, and webpack.

• React JS life cycle methods include componentDidMount, componentDidUpdate, and componentWillUnmount.

• Context API is used for sharing data between components without passing props down the component tree.

• Advantages of Context API include avoiding prop drilling and making it easier to manage global state.

• Disadvantages of Context API include potential performance issues and difficulty with testin...read more

Divide the 25 horses into 5 groups of 5 horses each, race them, then race the winners to determine the fastest 3 horses.

• Divide the 25 horses into 5 groups of 5 horses each and race them.

• Identify the top horse from each group.

• Race the top horses to determine the fastest 3 horses.

To find swapped numbers in a BST, perform inorder traversal and keep track of previous node.

• Perform inorder traversal of the BST

• Keep track of the previous node while traversing

• If at any point, the current node's value is less than the previous node's value, those are the swapped numbers

List virtualisation optimises rendering by only rendering items that are currently visible on the screen.

• Use virtual scrolling to render only the visible items in a list

• Implement windowing techniques to dynamically load and unload items as the user scrolls

• Utilize libraries like React Virtualized or Angular CDK Virtual Scroll for efficient list rendering

Pseudo elements are used to style specific parts of an element, while pseudo classes are used to style an element based on its state or position.

• Pseudo elements are denoted by :: before the element name, like ::before or ::after

• Pseudo classes are denoted by a single colon before the class name, like :hover or :active

• Pseudo elements are used to style parts of an element that do not exist in the DOM, like adding content before or after an element

• Pseudo classes are used to style...read more

To find the kth minimum element from a Binary Search Tree (BST)

• Perform an in-order traversal of the BST to get elements in sorted order

• Return the kth element from the sorted list

• Time complexity: O(n) where n is the number of nodes in the BST

Inline elements do not start on a new line and only take up as much width as necessary, while block elements start on a new line and take up the full width available.

• Inline elements do not force a new line to start and only take up as much width as necessary (e.g. <span>, <a>, <strong>).

• Block elements always start on a new line and take up the full width available (e.g. <div>, <p>, <h1>).

• Inline elements can have margin and padding applied horizontally but not vertically.

• Block...read more

I have extensive technical knowledge in Linux and Networking, including experience with system administration, network configuration, and troubleshooting.

• Proficient in Linux operating systems such as Ubuntu, CentOS, and Red Hat

• Experience with network protocols such as TCP/IP, DNS, DHCP, and VPN

• Skilled in configuring routers, switches, firewalls, and other network devices

• Knowledge of security practices and tools for securing networks and systems

• Familiar with virtualization tec...read more

Hash table is commonly used data structure to create a dictionary.

• Hash table is efficient for fast lookups and insertions.

• Keys are hashed to generate an index where the value is stored.

• Examples: Python dictionaries, Java HashMap, C++ unordered_map.

Create a counter component with start, stop, and reset buttons for a timer.

• Create a state variable to store the current count

• Use setInterval to increment the count every second when the timer is started

• Add buttons to start, stop, and reset the timer

• Implement functions for starting, stopping, and resetting the timer

Primitives in JS are data types that are not objects and are immutable.

• Types of primitives in JS include string, number, boolean, null, undefined, and symbol.

• Primitives are passed by value, not by reference.

• Examples: 'hello' (string), 42 (number), true (boolean), null, undefined, Symbol('foo')

Assumptions and characteristics of linear regression, random forest, and information gain.

• Assumptions of linear regression include linearity, independence, homoscedasticity, and normality of residuals.

• Random forest is an ensemble learning method that builds multiple decision trees and merges them together to improve performance.

• Information gain is a measure used in decision trees to determine the relevance of a feature by calculating the reduction in entropy or impurity.

Designing Uber involves creating a platform for on-demand transportation services.

• Develop a user-friendly mobile app for customers to request rides

• Implement a driver app for drivers to accept ride requests and navigate to pick-up locations

• Build a backend system to match drivers with riders based on location and availability

• Incorporate a payment system for seamless transactions

• Include features like real-time tracking, ratings, and reviews for both drivers and riders