Mercari IOS Developer Interview Questions and Answers

Find distinct island, check if balanced parenthesis

Q1. Asked me to develop an android app with weather forecast (use dependency injection)
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Q2. Develop weather forecast app
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Develop a weather forecast app for Android platform.
• Utilize APIs like OpenWeatherMap for real-time weather data

• Include features like current weather, hourly forecast, and 7-day forecast

• Implement location-based weather updates

• Design user-friendly interface with intuitive navigation

• Incorporate push notifications for weather alerts
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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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The first round consisted of a coding exercise along with fundamental questions related to React Native, JavaScript, and inquiries about objects and arrays.

Q1. Native modules, useRef, Flatlist
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Q1. Lazy vs latinit
Ans. 
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
Ans. 
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. Activities lifestyle
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Q2. Compose kotlin
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Q1. MVVM pattern and coroutines
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Q1. Recyclerview practical impl with itemview
Ans. 
RecyclerView is used to display large sets of data efficiently. ItemView is used to define the layout of each item in the list.
• RecyclerView is a more advanced version of ListView and GridView

• ItemView is a layout file that defines the UI for each item in the list

• RecyclerView.Adapter is used to bind the data to the views

• RecyclerView.LayoutManager is used to define the layout of the RecyclerView

• RecyclerView.ViewHolder is
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Q1. History check with previous companies
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Q1. What's the difference between Class and Struct
Ans. 
Classes are reference types, while structs are value types in Swift.
• Classes are reference types, meaning they are passed by reference, while structs are value types, passed by value.

• Classes support inheritance, while structs do not.

• Classes have deinitializers, while structs do not.

• Classes can have reference counting for memory management, while structs do not.

• Example: Class - Person, Struct - Point
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Q2. What is ARC and what's retain count
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ARC stands for Automatic Reference Counting, a memory management system used in iOS development. Retain count is the number of references to an object.
• ARC is a memory management system in iOS that automatically tracks and manages memory usage.

• Retain count is the number of strong references to an object, which determines when the object should be deallocated.

• When an object's retain count reaches 0, it is deallocated fro...read more
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