showing results for - "use example react usereducer"
Daniele
20 Nov 2018
1const initialState = {count: 0};
2
3function reducer(state, action) {
4  switch (action.type) {
5    case 'increment':
6      return {count: state.count + 1};
7    case 'decrement':
8      return {count: state.count - 1};
9    default:
10      throw new Error();
11  }
12}
13
14function Counter() {
15  const [state, dispatch] = useReducer(reducer, initialState);
16  return (
17    <>
18      Count: {state.count}
19      <button onClick={() => dispatch({type: 'decrement'})}>-</button>
20      <button onClick={() => dispatch({type: 'increment'})}>+</button>
21    </>
22  );
23}
Bastien
12 Mar 2016
1import React, { useState, useReducer } from "react";
2import ReactDOM from "react-dom";
3
4import "./styles.css";
5
6function reducer(state, action) {
7  switch (action.type) {
8    case "add":
9      return [...state, action.item];
10    case "remove":
11      return [
12        ...state.slice(0, action.index),
13        ...state.slice(action.index + 1)
14      ];
15    default:
16      throw new Error();
17  }
18}
19
20function FavoriteMovies() {
21  const [movies, dispatch] = useReducer(reducer, [{ name: "Heat" }]);
22  const [newMovie, setNewMovie] = useState("");
23
24  const handleAddClick = () => {
25    if (newMovie === "") {
26      return;
27    }
28    dispatch({ type: "add", item: { name: newMovie } });
29    setNewMovie("");
30  };
31
32  return (
33    <>
34      <div className="movies">
35        {movies.map((movie, index) => {
36          return (
37            <Movie
38              movie={movie}
39              onRemove={() => dispatch({ type: "remove", index })}
40            />
41          );
42        })}
43      </div>
44      <div className="add-movie">
45        <input
46          type="text"
47          value={newMovie}
48          onChange={event => setNewMovie(event.target.value)}
49        />
50        <button onClick={handleAddClick}>Add movie</button>
51      </div>
52    </>
53  );
54}
55
56function Movie({ movie, onRemove }) {
57  return (
58    <div className="movie">
59      <span>{movie.name}</span>
60      <button onClick={onRemove}>Remove</button>
61    </div>
62  );
63}
64
65function App() {
66  return (
67    <div className="App">
68      <h2>My favorite movies</h2>
69      <FavoriteMovies />
70    </div>
71  );
72}
73
74const rootElement = document.getElementById("root");
75ReactDOM.render(<App />, rootElement);
76
Soren
30 Sep 2020
1const [state, dispatch] = useReducer(reducer, initialState);
queries leading to this page
how to use usereducer hooks in reactusereducer jsxhow to use usereducer in reactusereducer usesusereducer react examplewhat is a react reducerreact 17 usereducerreact hook apiuserreducer react functionreact usereducer dispatchstate object context reducer reactusereducer setusereducer react init funcusereducer idreact usememo unlessreact calling reducerwhy we use reducer in reactusereducer react jsusereducer trong reactjsreact js usereducerexample usereducerusereducer function to load to initial stateusereducer hookusereducer with parametersreact native usereducer documentation 27udereducer reactwhy use react usereducerusereducer initial state as objectcreate a well designed reducer in reactreact useref combined with usereducerif will use callback in action what is the role of reducer react nativereactjs reducerwhat is a reducer reactreact usereducer hookadvantages of usereducer in reactwhat is great about usereducer hookuse redux usereducer in react nativeusereducer wikiusereducer 2b reactusereducers in react jshow to react usereducer worksusereducer examplereact native usereducer documentationusereducer documentationusereducer in reactreact onclick dispatch usereducerreact reducer hook class componentusereducer with resuce statewhat is a reducer in reduxusereducer reduxwhat to use as the init ragument of usereducer in reactreact simpler usereducerreact usereducer explainedusereducer react usosusereducer 26 dispatch reactuse reducer in react jsusereducer what does it returnreact usereducer payloadwhat vestion of react have usereaducerreducer react examplereducer example in react jsreact usereducereact why use usereducerreducer function in reactusereducer set valueusereducer parameterswhat does the usereducer do in reactpass arguments to dispatch react js hooksreact usecontext with usereducerusereducer hook reactreact usereducerusereducer sign up react hookequivalent usereducer in class react componentreact hook useeffect dispatchhow to use the usereducer statement in reactwhen might you use usereducer over usestate in a react componentusereducer call apiuse reducer react from childreact import usereducerusereducer hook react jsreact usereducer in class componentreact component reducerhow to create a reducer in reactredux usereducerusereducer dispatch payloadreact usereduer react usereducerusereduce 28 29 reactreact redux reducers exampleusereducer api detailusereducer react hook importusereducer reactjs docsreact reducer codewhat is usereducer in react hooksreact typescript usereducerusereducers in class componentusereducer getreact usereducer tutorialusereducer 28 29usereducer in react exampleusereducer importreact hook dispatch callbackreact usereducer examlereact usereducerreact usereducer map reducerwhen to use usereducer and reduxreact useeffect usereducerusereducer hook usagehow often is usereducer used in reactusereduce hookusereducer react js exampleuse reducer in react returnsreact redux reducerreact hoor usereducerusereducer react routercan we use usereducer instead of reduxwhat is usereducer 28 29 in react 3freact reducers explaineduseeffect react dispatchhow to create reducer in reduxusereducer in functional component exampleusereducer 28 29 hook react react reducer jsreducer react hookswhat are reducers reactusereducer in react native examplereducer in react hooksis hook and use state sameusereducer hook in reactreducer en react jsusing usereducer with reduxreducer examplereact what are reducersreactjs when to usereducerreact reduce 28 29usereducer and reduxjavascript create own usereducer refactoring usereducer react usestate previous statereact what is usereducerusereducer explain with examplewhat usereducer in react jsuse contexxt hookreact usereducer hook examplereducers in reactreact usereducer and reducerwhat is usereducer in reactusereducer hook in react jsuse reducer examplewhy usereducer hookreact router dom with usereducerhow to use usereducer and contexxt api in reactusereducer trong reactuse reducer expmapleusereducer in class componentreact hooks provider as well as usecontexthow to set value to reducer reactdispatch in usereduceruse reducer reactusereducer in react jsusereducer with reduxusereducer functionreact reducer examplewhat is a reducer in reacthow to practice using usereducer react jsexample of usereducerusereducers in reactreact usereducer examplesusereducer of reactis redux and usereducerusereducer react js implementusereducer react nativeusereducer hook examplereact js use reducerreact js usereducerreduce in reactwhat is react reducerwhat is usereducer hookuseref reactusereducers reactusereducer in classreact functional usereducerhow to make usereducer in react hooksreducer reactwhat is the action in usereducerusereducer react hooksusereducer 28 29 hookusereducer api callwhat is the use of usereducer in reactwhat is reducer in reduxwhat are react reducersusereducer function deefinitionusereducer apireact usereducer mediumusereducer react ruterusereducer current nulldispatch hook reactdispatch all function react hooredux reducer exampleusereducer in reactjsreducer meaning reduxusereducer classusereducer browser reactusereduce in react nativereducer in reactuserreducer reactwhat does userreducer returnhow to call reducers function in reactpurpose of react usereducerwhen we use usereducer in reactreact usereducer with init functionreduce reactreact export usereducerreact usereducer documentationusing usereduceruseref hookreact reducersusereducer update with new payloadusereducer implementation in reactusereducer init reactwhat is the reducer in reduxreduce reactjsusereducer promisewhy use usereducer hookwhat does react usereducer hook take as input and what does it return 3fwhen to usereducer reactwhen to use usereducer reactcan i use a function in usereducerusereducer jsreact reducers exampleusereducer react js nedirreact use reducerusecallback with usereducereact usereducer usewhat is use reucer in reactset reducer reactjsusereducer in reduxusereduce reacthow to use reduce in react jsusereducer code examplereactjs usereduceexplanation of usereducer in reactjsusereducer react jshow to call a usereducer in reactdifference between useeffect and usestatereact reducer reduce in reactreact userecucerreact usereducewrusereducer syntaxusereducer payload examplewhat is the use of usereducer examplereact usereducer and usememoredux with react reducerreact js redux reducerusereducer calculette react jsreact usereducerreducer total in react jsreduce react meyhod hooksredux what is reduceruse reducer in reacthow to pass usereducer react hooksreact hooks context reducerreact usereducer in expressjsusereducer reactjsusereducer hook with reduxusereducer hook documentationusereducer use in reactusing usereducer over usestatereact hook usereducerexample of usereducer reactusereducer state managementreact withreducerwhat does usereducer returnreact type usereducerreact when to use usereducerreact usereducer exampledispatch in react hooksreact hooks use reducerreact hooks usereducer exampleusereducer detail exampleusereducer in jsreact usereducerfwhat is the action of a usereducerreact userefusereducer reactusereducer hooks rocketpayload in usereducer examplewhat is usereducer in react jswhy we using dispatch as second argument in useeffectusereducer with object examplehow to use reducer in react hooksclass component in react with usereduceruse redcuer exampleusereducer react hookusereduce in reactreact onclick dispatch usereduce3rcustom usereducer hookis usereducer used in reduxwhat is difference between usestate directly change state or use callbackreactjs usereducerreducer redux exampleusereducer hook explainedreact useredcuer examplesusereduce 28 29 reacgreact hooks reducerexample of usereducer hookcall usereducer in class componentreact userdeucerusing usereducer in react nativewhat is reducer in react jsreact redux usereducerusereducer 28 29 react react js reduce initail state usereducerwhat is use of usereducer in reactreducer hook reactuse reducer example with useeffectsreducer reactjsuse of usereducer hookusereducer with out functionhow to pass reducer function to usereducer hookwhat does reducer do in redux reactusereducer statereact usereducer syntaxusereducer example react hooksreact reducer functionauth using usereducer in reactwhat is the reducer in react js reduxuse reducer in react hooksusereducer returnusereducer react arrayswhat does the usereducer function do 3fwhen to usereduce reactreact reducer hook exampleuse example react usereducerreact usereducer 28react js coding for reduce methoduse reducer hookuse reducerusereducer in react mediumreact usereducer nedirreact usereducer 28 29 documentationreact usereducer custom hookwhat is usereducer reactwhat are reducers in reactreducer in reduxreact useresouce examplewhere to use usereducer in reactusereducer in react nativeusereducer 2b default valulecreate reducer react reduxreact reducer hookswhat does usereducer hook doreact usereducer objecthow to get value in 5but in react js hoockhook usereduceruse reducer in componentreact hooks usereducerwhat are the advantage of using usereducer in react jsreact userreducer react how to use usereducerreduce function in reactreact reducer sampleusereducer in react tswhere do you define usereducerwhen to use reducer reactusereducerreact component usereducer usereducer custom hookdispatch react hooksuser educer in reactusing usereducer in reactusereducer in react hooks exampleusereducer in contect apispreader in usereducer hookreact why we use usereducerusereducer inside functionusereducer refactoringcan you use usereducer on class components reactuse action reducer react native hookreact reducer hook simple examplereact reducer with multiple state and useeffectwhat is a redux reducerwhat does usereducer do in reactactual use of usereducer in reactreact call reducer how often do you us usereducer hookexample when to use usereducerexamples of usereducer in reactbasic example usereducerreact usereducer class componentwhat is usereducer equivalent in class componenthow to use usereducer with reduxusereducer callbackcreate reducer and usage redux reactcreatereducer and usereducer example how to change a value in usereducer in react jsreduceer in reactuserreducer functionwhat is usereducer in react hoksusereducer example reactusedebug hookusereducer javascriptdo you need to spread in previous state with react usereducerunderstanding usereducer inistial stateusereducer payloadreactjs redux reducerwhen need usereducer reactreactjs usereducer examplewhat is react usereducerusereducer hook mediumusereducer in react providerusereducer example in react jssyntax of usereducerreact usereaducerstate usereducer in reactunderstanding dispatch in usereducerreact reducereact dispatch hooksuseref in reactusereducer for class component of reactuse usereducer in reactusereducer example with payloadreact usereducer exampleusereducer react examplesreact hooks referencereduce in react jscan i return a component in usereducer 3fwhy usereducer is use in reacttesting usereducerusereducer method in react hooksusereducer rerenders usestatereducer nedir reactreact 2c simple usereducer examplereact how to use usereducer to handle statehow does the reducer function understand the state in usereducerreactjs when to use usereducerwhat is reducer in reactreact usereducer inside componentreact usereducer 28mytable reducerconst 5b 5d 3d usereducer 28 29how to use reducer in reactwhen you call usereducer and pass in a reducer and an initial state object 2c what does it return 3freact testing usereducerusereducer re renders usestatewhy we use usereducer in reactrect usecontextwhat is the reducer hookusereducer in react domhow to use usereducer in react mediumusecallback on reducer functionlist of hooks in reactusereducer react explanationusereducer is it reactreact native usereducer exampleacces usereducer state reacthow to use usereducer in react contex apihow to usereducer for an apiuse example react usereducer