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The variable send_warning only has meaning in an action context within a rule. Because user-defined actions are first-class values (i.e., they can be returned as the result of executing an expression), they can be passed into functions or other user-defined actions and returned as the result from a function. You can thus write recursive actions.
User defined actions may also return values. The returned value may be a string, map, array etc. Consider the following from the pico-engine version 0.43.0:
| Code Block | ||||
|---|---|---|---|---|
| ||||
deleteChild = defaction(pico_name){
ent_children = children(){"children"}
child_collection = ent_children.collect(function(child){
(child{"name"} == pico_name) => "to_delete" | "dont_delete"
})
child_to_delete = child_collection{"to_delete"}.head()
every {
engine:removePico(child_to_delete{"id"})
}
returns
{
"updated_children": child_collection{"dont_delete"},
"child": child_to_delete
}
} |
To retrieve the returned value (in this case a map), bind it to a new name using "setting":
| Code Block |
|---|
deleteChild(<give pico name>) setting(returnValue) |