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This is a sample Ballerina extension for demonstration purpose, which you can use as a sample to build your own ballerinaexternal functions.

Template:https://github.com/ldclakmal/ballerina-extension-quickstart

1. Refer to theSetting up Ballerina guide to download and install Ballerina.
2. Clone theballerina-connector-quickstart GitHub repository.
3. Move inside toballerina-extension-quickstart directory and execute$ ./gradlew build. It should compile the source, run the tests and generates the executables.

Import theldclakmal/extension module into your Ballerina project and check the usage of samplemax function.

importballerina/io;importldclakmal/extension;publicfunction main() {int maxNo=extension:max(2,10);io:println(maxNo);}