Created
April 25, 2020 14:00
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This is the basic implementation (without a few minor details) of createStore function of Redux library
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const createStore = (reducer) => { | |
let state; | |
let listeners = []; | |
const getState = () => state; | |
const dispatch = (action) => { | |
state = reducer(state, action); | |
listeners.forEach((listener) => listener()); | |
}; | |
const subscribe = (listener) => { | |
listeners.push(listener); | |
return () => { | |
listeners = listeners.filter((l) => l !== listener); | |
}; | |
}; | |
dispatch({}); | |
return { getState, dispatch, subscribe }; | |
}; |
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