QuyTech Interview Questions, Process, and Tips

Redux is a predictable state container for JavaScript apps. It helps manage application state in a more organized and efficient way.

• Centralized state management

• Predictable state changes with actions and reducers

• Easier debugging and testing

• Helps in scaling and maintaining large applications

• Example: Storing user authentication state across the app

useState, useEffect, useContext, useReducer, useRef

• useState - for managing state in functional components

• useEffect - for side effects in functional components

• useContext - for accessing context in functional components

• useReducer - for managing complex state logic

• useRef - for accessing DOM elements or storing mutable values

ES6 is the 6th version of ECMAScript, introducing new features and syntax improvements.

• Arrow functions for concise syntax: const add = (a, b) => a + b;

• Let and const for block-scoped variables: let x = 5; const y = 10;

• Template literals for string interpolation: const name = 'John'; console.log(`Hello, ${name}!`);

• Classes for object-oriented programming: class Person { constructor(name) { this.name = name; } }

• Destructurin...read more

let is block scoped, var is function scoped, const is a constant variable.

• let is block scoped, meaning it is only accessible within the block it is declared in.

• var is function scoped, meaning it is accessible throughout the function it is declared in.

• const is a constant variable, its value cannot be reassigned once it is initialized.

Setting up push notifications involves configuring a push notification service, integrating it with the app, and handling notifications in the code.

• Choose a push notification service provider like Firebase Cloud Messaging (FCM) or OneSignal.

• Set up an account with the chosen service provider and obtain necessary credentials (API keys, tokens, etc).

• Integrate the push notification SDK provided by the service provider into...read more

Optimizing bundle size in React Native involves code splitting, tree shaking, lazy loading, and using smaller libraries.

• Use code splitting to split the code into smaller chunks that can be loaded on demand.

• Utilize tree shaking to remove unused code from the bundle.

• Implement lazy loading to only load components when they are needed.

• Choose smaller libraries or custom solutions over large dependencies to reduce bundle siz...read more