CGI Group React Native Developer Interview Questions and Answers

Q1. Encription and decription in swift
Ans. 
Encryption and decryption in Swift involves using cryptographic algorithms to encode and decode data securely.
• Use common encryption algorithms like AES or RSA for encryption.

• Implement encryption using libraries like CommonCrypto or CryptoSwift.

• Store encryption keys securely and use secure protocols for data transmission.

• Example: Encrypting a string using AES encryption in Swift.
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Q2. Keychain access in swift
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Keychain access in Swift allows secure storage of sensitive information like passwords, tokens, etc.
• Use Keychain Services API to securely store and retrieve sensitive data.

• Keychain items are stored securely in the device's keychain and are encrypted.

• Access keychain items using unique identifiers called keys.

• Use Keychain Swift library for easier implementation.
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Q3. Class vs struct
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Classes are reference types, while structs are value types in Swift.
• Classes are reference types, meaning they point to the same instance in memory when assigned to a new variable.

• Structs are value types, meaning they create a new copy when assigned to a new variable.

• Use classes for complex data structures or when you need inheritance, use structs for simple data types or when you want value semantics.

• Example: class Per...read more
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Q4. If let and guard let
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Q5. Grand central dispatch in swift
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Grand Central Dispatch (GCD) is a technology in Swift for managing concurrent operations.
• GCD allows developers to perform tasks concurrently without having to manage threads manually.

• It provides a high-level API for managing tasks and executing them on different queues.

• Developers can use GCD to perform tasks in the background, update the UI on the main thread, and more.
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Q1. Android Basics on mvvm architecture
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Q2. Navigation Component
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Q3. Jetpack components- work manager, viewmodel
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Q1. Managerial questions
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They asked , some cording question related to react js , html

The question about prblm solving

Any presentation or pdf to submit it at any topic or else to explain it

The discussion with my team mate

Q1. Japanese reading and introduce
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Q2. Kanji reading and meaning
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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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Q1. Lifecycle of an activity
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The lifecycle of an activity in Android refers to the different states an activity goes through during its lifetime.
• onCreate() method is called when the activity is first created

• onStart() method is called when the activity becomes visible to the user

• onResume() method is called when the activity starts interacting with the user

• onPause() method is called when the activity is partially obscured

• onStop() method is called wh...read more
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Q2. Lifecycle of a fragment
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Fragment lifecycle includes onAttach, onCreate, onCreateView, onStart, onResume, onPause, onStop, onDestroyView, onDestroy, onDetach.
• onAttach() - fragment is associated with an activity

• onCreate() - initialize essential components

• onCreateView() - create the fragment's view hierarchy

• onStart() - fragment becomes visible

• onResume() - fragment is interacting with the user

• onPause() - fragment is partially visible

• onStop() - fr...read more
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Q1. Singletone, multithreading, oops
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