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gordonbrander/states.js

Created July 16, 2015 22:04
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Finite state switcher
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states.js
// Create a finite state switching function.
// Given a list of states, returns a function that will take a `prev` state
// and `next` state and will only advance state to `next` if it is one of
// the defined states.
const states = (...states) => (prev, next) =>
states.indexOf(next) !== -1 ? next : prev;
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