Step

Some stuff

type Step state msg output

Step

a Step state msg output describes one step of a state machine.

On each step, the state machine can either

noop, staying in the same state and executing no commands
step to some new state, potentially executing msg-returning commands
exit, and return a value of type output

map : (a -> b) -> Step a msg output -> Step b msg output

noop : Step state msg output

orElse :

Step state msg output

-> Step state msg output

run : Step state msg Never -> Maybe ( state, Cmd msg )

to : state -> Step state msg output

step to a state with no commands

withCmd : Cmd msg -> Step state msg output -> Step state msg output

mapMsg : (a -> b) -> Step state a output -> Step state b output

exit : output -> Step state msg output

mapExit : (o -> p) -> Step state msg o -> Step state msg p

onExit : (o -> Step state msg p) -> Step state msg o -> Step state msg p

asUpdateFunction :

(msg -> model -> Step model msg Never)

-> msg

-> model

-> ( model, Cmd msg )

asUpdateFunction

a little helper function for the common case: turn an update function that returns a Step to a normal elm architecture update function uses run internally to default with the provided model in case of a noop

foldSteps :

{ init : Step model msg output

, update : msg -> model -> Step model msg output

, msgs : List msg

}

-> Step model msg output

starting from an initial state, fold an update function over a list of messages

Modules

Step

xilnocas/step/1.1.0

Step

Modules