React-native-eval is a library that allows you to evaluate JavaScript code within your React Native application. This can be useful for dynamically executing code snippets, running user-generated code, or enhancing the flexibility of your app. This documentation will guide you through the installation process, usage examples, and available methods.
To install react-native-eval, follow these steps:
1. Install the package using npm:
“`
npm install react-native-eval
“`
2. Link the package to your project:
“`
react-native link react-native-eval
“`
3. For iOS, add the following configuration:
– Open your Xcode project.
– Go to your target settings.
– Under the “Build Phases” tab, expand “Link Binary With Libraries”.
– Add `libReactNativeEval.a` to the list.
4. For Android, no additional configuration is required.
To use react-native-eval in your React Native project, follow these steps:
1. Import the library:
“`javascript
import RNReactNativeEval from ‘react-native-eval’;
“`
2. Execute JavaScript code:
“`javascript
RNReactNativeEval.evaluate(‘console.log(“Hello, world!”)’)
.then(result => {
console.log(‘Evaluation result:’, result);
})
.catch(error => {
console.error(‘Evaluation error:’, error);
});
“`
3. You can also execute code from a file:
“`javascript
RNReactNativeEval.evalFile(‘path/to/file.js’)
.then(result => {
console.log(‘Evaluation result:’, result);
})
.catch(error => {
console.error(‘Evaluation error:’, error);
});
“`
The following methods are available in the react-native-eval library:
– `evaluate(code: string): Promise
– `evalFile(filePath: string): Promise
Here are some examples showcasing the usage of react-native-eval:
1. Execute a simple JavaScript expression:
“`javascript
RNReactNativeEval.evaluate(‘4 + 5’)
.then(result => {
console.log(‘Evaluation result:’, result); // Output: 9
})
.catch(error => {
console.error(‘Evaluation error:’, error);
});
“`
2. Execute user-generated code:
“`javascript
const userCode = ‘const foo = “bar”; foo.toUpperCase();’;
RNReactNativeEval.evaluate(userCode)
.then(result => {
console.log(‘Evaluation result:’, result); // Output: “BAR”
})
.catch(error => {
console.error(‘Evaluation error:’, error);
});
“`
3. Evaluate code from a file:
“`javascript
RNReactNativeEval.evalFile(‘path/to/file.js’)
.then(result => {
console.log(‘Evaluation result:’, result);
})
.catch(error => {
console.error(‘Evaluation error:’, error);
});
“`
React-native-eval provides a straightforward way to evaluate JavaScript code within your React Native application. By following the installation steps and understanding the available methods, you can enhance the dynamic capabilities of your app. Explore the documentation further for a detailed explanation of each method and additional example scenarios. Feel free to experiment and leverage the power of react-native-eval in your projects!