@startuml !$data = { "a": "foo", "b": "bar" } !procedure $add($name) !if %json_key_exists($data, $name) participant $name as $name !else database $name as $name !endif !endprocedure !procedure $add2($name) !if %json_key_exists($data, $name) !if $data[$name]=="foo" participant $name as $name !else boundary $name as $name !endif !else database $name as $name !endif !endprocedure $add("a") $add("c") $add2("b") $add2("d") @enduml Submit amiga aws-orange black-knight bluegray blueprint cerulean-outline cerulean crt-amber crt-green cyborg-outline cyborg hacker lightgray mars materia-outline materia metal mimeograph minty plain reddress-darkblue reddress-darkgreen reddress-darkorange reddress-darkred reddress-lightblue reddress-lightgreen reddress-lightorange reddress-lightred sandstone silver sketchy-outline sketchy spacelab spacelab-white superhero-outline superhero toy united vibrant       🎉 Discover the future PlantUML Web Editor! 🚀  PNG  SVG  ASCII Art