A very simple demo of Opa
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README.markdown
hello-opa.opa

README.markdown

Summary

This is a very simple demo of Opa. It just shows a header "Hello, world" and upon clicking the header it informs the user how many times it was cliked so far.

Compile and run with:

opa hello-opa.opa --

More about this example in Opa manual, chapter Hello, database.