Droisys IOS Developer Interview Questions and Answers

Q1. Do sorting without higher order functions, Remote notifications
Ans. 
Sorting without higher order functions and remote notifications
• Implement sorting algorithm like bubble sort, selection sort, or insertion sort without using built-in sort functions

• For remote notifications, use Apple Push Notification Service (APNs) to send notifications to users' devices
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Basic interview on question like aptitude, javascript, typescript and react-native question

Q1. Basic javascript question in second round
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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
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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'); })();
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Q4. Deeply they ask me closure related question how it's working
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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
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Q1. Project related discussion only
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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
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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
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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
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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
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Q4. Error monitoring tools and sentry related
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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
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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.
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Q1. Basic android questions
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Q2. Services mvvm roomdb and all basic android things
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Q1. Oops , programming, collection, java basic and Kotlin basic
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Q1. Japanese reading and introduce
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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
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