Requirements:

1. User Interface:

• Replicate the provided mockups as closely as possible.
• Implement a currency selection screen with a searchable list displaying currency codes and names. Highlight the selected currency visually as represented in the design.
• Create a conversion screen with a field for entering the amount and buttons for selecting currencies.

2. Functionality:

• Integrate the openexchangerates.org API to fetch the latest currency exchange rates.
• Ensure the currency conversion calculation is accurate and updates as the user types.
• Store the latest fetched exchange rates locally and allow the app to work offline with the last known rates.
• Implement a swap function to quickly invert the 'From' and 'To' currencies.
• Show only available currencies from the API in the currency selection list

3. Code Quality:

• Write clean, readable, and maintainable code.
• Ensure the app is properly typed with TypeScript.
• Handle API errors gracefully and display user-friendly error messages.

4. Performance:

• Optimize the app for performance, especially the currency selection list.

Deliverables:

1. Source code pushed to a Git repository (e.g., GitHub, GitLab).
2. Documentation on how to run the application locally.
3. A brief explanation of the app architecture and any third-party libraries used.

Evaluation Criteria:

• Adherence to the design mockups and requirements.
• Code quality, including readability and adherence to TypeScript best practices.
• App performance and handling of edge cases.
• Completeness of the implemented features.
• Any additional features or touches that improve the app's usability or user experience.

Getting Started

Step 1: clone and install

git clone https://github.com/GemsGame/react-native-currency-converter.git

cd react-native-currency-converter

npm install

Step 2: Start the App

Let Metro Bundler run in its own terminal. Open a new terminal from the root of your React Native project. Run the following command to start your Android or iOS app:

npm run android

npm run ios

If everything is set up correctly, you should see your new app running in your Android Emulator or iOS Simulator shortly provided you have set up your emulator/simulator correctly.

This is one way to run your app — you can also run it directly from within Android Studio and Xcode respectively.

Explanation about arhitecture

In the project, I have been using the Flux architecture for state management, which ensures that data flows in a one-way direction. This is the most popular and best practice solution when we are talking about data managment in the web/mob applications on React Native. The important libraries for this are:

• react-redux
• @reduxjs/toolkit

Also we need a local database for a data saving and offline mode and synchronization tool. We should provide data updation between a database and temporary local storage.

• @react-native-async-storage/async-storage
• redux-persist

As you can see, the app has another dependencies which must be include to our buiild. Witout it we can't to use navigation, screens.

• @react-navigation/native
• @react-navigation/native-stack