Here’s how you would write “Hello World!” in Opa:
import "lib.js" as JS;
function () {
JS.console.log("Hello World!");
}
This code first imports the JavaScript library, then defines a function that logs “Hello World!” to the console using JavaScript’s console.log method.
Please note that Opa is primarily designed for server-side programming and complex web applications, not so much for simple console outputs as this example demonstrates. It’s a high-level language focusing on type safety and concurrency, which might be overkill for such a basic task.
For a more typical “Hello World!” in Opa (a simple web application), you’d write:
import Server;
server {
service myService {
get / HelloWorld =>
"<html><body><h1>Hello World!</h1></body></html>"
}
}
This defines a simple server-side route that responds to any GET request at the /HelloWorld path with an “HTML” response containing “Hello World!”.
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