RedBus IOS Developer Interview Questions and Answers

Medium question on hashmap

Q1. Design question which checks oops concept and data structure
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Q1. Basic JS question event loop, promises, polyfill.
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Q2. JS output based, Flatten object.
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Q1. Lazy vs latinit
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lazy vs lateinit are both used in Kotlin to delay the initialization of variables, but lazy is for val properties and lateinit is for var properties.
• lazy is a property delegate that initializes the value only upon first access

• lateinit is used for var properties that are guaranteed to be initialized before accessing them

• lazy can be used for properties that are computationally expensive to initialize, while lateinit is u...read more
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Q2. Hashmap vs hashtable
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Hashtable is synchronized and slower, while hashmap is not synchronized and faster.
• Hashtable is synchronized, while hashmap is not.

• Hashtable does not allow null keys or values, while hashmap allows one null key and multiple null values.

• Hashtable is thread-safe, while hashmap is not.

• Hashtable is slower than hashmap due to synchronization.

• Example: Hashtable ht = new Hashtable(); HashMap hm = new HashMap();
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Q1. What is coroutine?
Ans. 
Coroutines are light-weight threads that help manage asynchronous tasks efficiently in Android development.
• Coroutines are part of Kotlin's standard library and are used for managing asynchronous tasks without blocking the main thread.

• They allow developers to write asynchronous code in a sequential manner, making it easier to understand and maintain.

• Coroutines can be used for tasks like network requests, database operat...read more
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Q2. What is Services in Java.
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Services in Java are components that run in the background to perform long-running operations independently of the UI.
• Services can be used to handle network transactions, play music, perform file I/O, etc.

• Services do not have a user interface.

• Services can be started, bound, or both.

• Examples of services include music player running in the background, downloading files, etc.
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Q1. What are higher order functions in swift?
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Higher order functions in Swift are functions that can take other functions as parameters or return functions as results.
• Higher order functions include map, filter, and reduce in Swift.

• They allow for more concise and readable code by abstracting common patterns of code.

• Example: map function can be used to transform each element in an array without using a loop.
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Q2. Difference between static dispatch and dynamic dispatch.
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Static dispatch is determined at compile time, while dynamic dispatch is determined at runtime.
• Static dispatch is also known as early binding, while dynamic dispatch is also known as late binding.

• Static dispatch is faster as the method to be called is known at compile time, while dynamic dispatch incurs a slight performance overhead as the method to be called is determined at runtime.

• In static dispatch, the method to b...read more
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Q1. Activities lifestyle
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Q2. Compose kotlin
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The first round is Hackerrank two algo and one UI test very easy, Second is Fundamentals of JS and React Native one must have a deep understanding of JS to do that I strongly suggest going through Akashay Saini's JS series It'll help and the Third is PS/DS asked some basic A&DS questions can be solved easily with little practice on Leetcode