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javascript-state-machine
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A library for finite state machines.
VERSION 3.0 Is a significant rewrite from earlier versions. Existing 2.x users should be sure to read the Upgrade Guide.
In a browser:
<script src='state-machine.js'></script>
after downloading the source or the minified version
Using npm:
npm install --save-dev javascript-state-machine
In Node.js:
var StateMachine = require('javascript-state-machine');
A state machine can be constructed using:
var fsm = new StateMachine({
init: 'solid',
transitions: [
{ name: 'melt', from: 'solid', to: 'liquid' },
{ name: 'freeze', from: 'liquid', to: 'solid' },
{ name: 'vaporize', from: 'liquid', to: 'gas' },
{ name: 'condense', from: 'gas', to: 'liquid' }
],
methods: {
onMelt: function() { console.log('I melted') },
onFreeze: function() { console.log('I froze') },
onVaporize: function() { console.log('I vaporized') },
onCondense: function() { console.log('I condensed') }
}
});
... which creates an object with a current state property:
fsm.state
... methods to transition to a different state:
fsm.melt()
fsm.freeze()
fsm.vaporize()
fsm.condense()
... observer methods called automatically during the lifecycle of a transition:
onMelt()
onFreeze()
onVaporize()
onCondense()
... along with the following helper methods:
fsm.is(s)
- return true if state s
is the current statefsm.can(t)
- return true if transition t
can occur from the current statefsm.cannot(t)
- return true if transition t
cannot occur from the current statefsm.transitions()
- return list of transitions that are allowed from the current statefsm.allTransitions()
- return list of all possible transitionsfsm.allStates()
- return list of all possible statesA state machine consists of a set of States
A state machine changes state by using Transitions
A state machine can perform actions during a transition by observing Lifecycle Events
A state machine can also have arbitrary Data and Methods.
Multiple instances of a state machine can be created using a State Machine Factory.
Read more about
You can Contribute to this project with issues or pull requests.
See RELEASE NOTES file.
See MIT LICENSE file.
If you have any ideas, feedback, requests or bug reports, you can reach me at jake@codeincomplete.com, or via my website: Code inComplete
FAQs
A finite state machine library
The npm package javascript-state-machine receives a total of 84,566 weekly downloads. As such, javascript-state-machine popularity was classified as popular.
We found that javascript-state-machine demonstrated a not healthy version release cadence and project activity because the last version was released a year ago. It has 1 open source maintainer collaborating on the project.
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