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Update hello world example to Ballerina 2201.0.0 version |
Add REST API example |
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=== Hello World ===
The regular Hello World program:
<syntaxhighlight>
import ballerina/io;
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io:println("Hello World!");
}
</syntaxhighlight>
}}▼
To execute the above program, place the source code in a <code>.bal</code> file and provide the path of the file to the <code>bal run</code> command.
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The service version of the Hello World program:
<syntaxhighlight>
import ballerina/http;
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}
}
</syntaxhighlight>
Services are executed in the same manner, except they don't terminate like regular programs do. Once the service is up and running, one can use an HTTP client to invoke the service. For example, the above service can be invoked using the following cURL command:
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<ref name="example1">{{cite web |url=https://ballerina.io/learn/by-example/hello-world-service.html |title= Hello world service |author=Ballerina Team|date=16 September 2020 |publisher=ballerina.io}}</ref>
=== REST API ===
<syntaxhighlight>
import ballerina/http;
service on new http:Listener(9090) {
resource function post factorial(@http:Payload string payload) returns http:Ok|http:BadRequest {
int|error num = int:fromString(payload);
if num is error {
return <http:BadRequest>{body: "Invalid integer: " + payload};
}
if num < 0 {
return <http:BadRequest>{body: "Integer should be >= 0"};
}
int result = 1;
foreach int i in 2 ... num {
result *= i;
}
return <http:Ok>{body: result};
}
</syntaxhighlight>
<syntaxhighlight lang="console">
$ curl http://localhost:9090/factorial -d 5
120
</syntaxhighlight>
=== Workers ===
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