Clio supports event-based control flow. When we introduced flows, we mentioned a flow starts with data or a source. Events can be considered a source of data and can be used like this:
#echo -> emitter => echoecho:#message -> upper -> printecho -> emit #message 'hello events!'
In above example, we create a emitter named
#echo and store it in variable
echo. Then we use
: to listen to the
#message event of
echo, piping the message to
#message event using
echo, and we pass
'hello events!' as content of the message.
echo:#message acts as a data source here, every time there's new data it will be passed to the specified flow.