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JS Bin // source https://jsbin.com/qadavi
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<!DOCTYPE html> | |
<html> | |
<head> | |
<script src="https://npmcdn.com/expect/umd/expect.min.js"></script> | |
<script src="https://npmcdn.com/redux@3.5.2/dist/redux.js" | |
<meta charset="utf-8"> | |
<meta name="viewport" content="width=device-width"> | |
<title>JS Bin</title> | |
></script> | |
</head> | |
<body> | |
<script id="jsbin-javascript"> | |
'use strict'; | |
var counter = function counter(state, action) { | |
if (state === undefined) state = 0; | |
switch (action.type) { | |
case 'INCREMENT': | |
return state + 1; | |
case 'DECREMENT': | |
return state - 1; | |
default: | |
return state; | |
} | |
}; | |
//recreating createStore | |
var createStore = function createStore(reducer) { | |
var state = undefined; | |
var listeners = []; | |
var getState = function getState() { | |
return state; | |
}; | |
var dispatch = function dispatch(action) { | |
state = reducer(state, action); | |
listeners.forEach(function (listener) { | |
return listener(); | |
}); | |
}; | |
var subscribe = function subscribe(listener) { | |
listeners.push(listener); | |
return function () { | |
listeners = listeners.filter(function (l) { | |
return l !== listener; | |
}); | |
}; | |
}; | |
dispatch({}); | |
return { getState: getState, dispatch: dispatch, subscribe: subscribe }; | |
}; | |
var store = createStore(counter); | |
var render = function render() { | |
console.log(store.getState()); | |
document.body.innerText = store.getState(); | |
}; | |
store.subscribe(render); | |
render(); | |
//Add button action | |
document.addEventListener('click', function () { | |
store.dispatch({ type: 'INCREMENT' }); | |
}); | |
</script> | |
<script id="jsbin-source-javascript" type="text/javascript">const counter = (state = 0, action) => { | |
switch (action.type){ | |
case 'INCREMENT': | |
return state + 1; | |
case 'DECREMENT': | |
return state - 1; | |
default: | |
return state; | |
} | |
}; | |
//recreating createStore | |
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 }; | |
}; | |
const store = createStore(counter); | |
const render = () => { | |
console.log(store.getState()); | |
document.body.innerText = store.getState(); | |
}; | |
store.subscribe(render); | |
render(); | |
//Add button action | |
document.addEventListener('click', ()=>{ | |
store.dispatch({type:'INCREMENT'}); | |
});</script></body> | |
</html> |
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
'use strict'; | |
var counter = function counter(state, action) { | |
if (state === undefined) state = 0; | |
switch (action.type) { | |
case 'INCREMENT': | |
return state + 1; | |
case 'DECREMENT': | |
return state - 1; | |
default: | |
return state; | |
} | |
}; | |
//recreating createStore | |
var createStore = function createStore(reducer) { | |
var state = undefined; | |
var listeners = []; | |
var getState = function getState() { | |
return state; | |
}; | |
var dispatch = function dispatch(action) { | |
state = reducer(state, action); | |
listeners.forEach(function (listener) { | |
return listener(); | |
}); | |
}; | |
var subscribe = function subscribe(listener) { | |
listeners.push(listener); | |
return function () { | |
listeners = listeners.filter(function (l) { | |
return l !== listener; | |
}); | |
}; | |
}; | |
dispatch({}); | |
return { getState: getState, dispatch: dispatch, subscribe: subscribe }; | |
}; | |
var store = createStore(counter); | |
var render = function render() { | |
console.log(store.getState()); | |
document.body.innerText = store.getState(); | |
}; | |
store.subscribe(render); | |
render(); | |
//Add button action | |
document.addEventListener('click', function () { | |
store.dispatch({ type: 'INCREMENT' }); | |
}); |
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lesson 7, https://egghead.io/lessons/javascript-redux-implementing-store-from-scratch