Crayon'd Android Developer Interview Questions and Answers

Q1. Threading kotlin
Add your answer
Q2. Play services security
Add your answer

Q1. Basic android questions
Add your answer
Q2. Services mvvm roomdb and all basic android things
Add your answer

Basic interview on question like aptitude, javascript, typescript and react-native question

Q1. Basic javascript question in second round
Add your answer
Q2. What is function currying
Ans. 
Function currying is a technique in functional programming where a function with multiple arguments is transformed into a sequence of nested functions, each taking a single argument.
• Currying allows you to partially apply a function by fixing a number of arguments, which creates a new function.

• It helps in creating reusable functions and improves code readability.

• Example: const add = (a) => (b) => a + b; const add5 = add
Answered by AI
Add your answer
Q3. What is IIEF where we can use it
Ans. 
IIFE stands for Immediately Invoked Function Expression, used for creating a function that is executed immediately after it is defined.
• IIFE is used to create a private scope for variables to avoid polluting the global scope.

• It is commonly used in React Native development to encapsulate code and prevent naming conflicts.

• Example: (function() { console.log('IIFE executed'); })();
Answered by AI
Add your answer
Q4. Deeply they ask me closure related question how it's working
Add your answer
Q5. How call call stack and event loop is working
Ans. 
Call stack is used to keep track of function calls, while event loop manages asynchronous operations in JavaScript.
• Call stack is a data structure that keeps track of function calls in a program.

• When a function is called, it is added to the top of the call stack. When the function completes, it is removed from the stack.

• Event loop is responsible for managing asynchronous operations in JavaScript, ensuring that they are ...read more
Answered by AI
Add your answer

Q1. Project related discussion only
Add your answer

Q1. Explain hooks in react
Ans. 
Hooks are a new addition in React 16.8 that allow you to use state and other React features without writing a class.
• Hooks are functions that let you use state and other React features in functional components.

• useState() is a hook that allows you to add state to functional components.

• useEffect() is a hook that allows you to perform side effects in functional components.

• Custom hooks are reusable functions that can contai...read more
Answered by AI
Add your answer

Create weather application in react native with unit test scripts

Q1. Recent projects
Ans. 
Developed a mobile application for tracking daily water intake and hydration levels.
• Implemented user-friendly interface for inputting water intake

• Integrated notifications for reminding users to drink water

• Utilized database to store and track hydration data
Answered by AI
Add your answer
Q2. Technologies worked with
Ans. 
Experienced with technologies such as Java, Swift, React Native, and Firebase for mobile app development.
• Java

• Swift

• React Native

• Firebase
Answered by AI
Add your answer
Q3. Analytics tools used
Ans. 
Google Analytics, Firebase Analytics, Mixpanel
• Google Analytics for tracking user behavior

• Firebase Analytics for app performance monitoring

• Mixpanel for in-depth user analytics
Answered by AI
Add your answer
Q4. Error monitoring tools and sentry related
Add your answer
Q5. Redux vs local storage
Ans. 
Redux is a state management library for JavaScript applications, while local storage is a browser feature for storing data locally.
• Redux is used for managing the global state of an application, making it easier to access and update data across components.

• Local storage is used for storing data locally on the user's device, allowing for persistent data even after the browser is closed.

• Redux is typically used for more com...read more
Answered by AI
Add your answer
Q6. Caching in react native
Ans. 
Caching in React Native allows for storing data locally to improve app performance and reduce network requests.
• Use AsyncStorage for simple key-value pair caching in React Native.

• Implement caching strategies like cache expiration or cache invalidation to manage cached data effectively.

• Consider using libraries like redux-persist for more advanced caching capabilities in React Native.
Answered by AI
Add your answer

Q1. Oops , programming, collection, java basic and Kotlin basic
Add your answer

Q1. Japanese reading and introduce
Add your answer
Q2. Kanji reading and meaning
Ans. 
Kanji is a system of Japanese writing using Chinese characters. Each character has a reading and meaning.
• Kanji characters are used in combination with hiragana and katakana to write Japanese.

• There are over 2,000 commonly used kanji characters.

• Each kanji character has at least one reading and one meaning, but some have multiple readings and meanings.

• For example, the kanji character for 'tree' can be read as 'ki' or 'mok
Answered by AI
Add your answer

Q1. What is static in Java?
Add your answer
Q2. What is singleton?
Add your answer
Q3. What is Coroutines?
Add your answer
Q4. What is dispatcher?
Add your answer
Q5. What is with context in Coroutines?
Add your answer
Q6. How to raise request parallel in Coroutines?
Add your answer
Q7. Scoped functions in Kotlin.
Add your answer
Q8. Background task in Android.
Add your answer
Q9. What is the difference between interface and abstract class in Java?
Add your answer
Q10. What is let function?
Add your answer