Reducer

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Annoyed Antelope answered on October 1, 2020 Popularity 9/10 Helpfulness 1/10

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// Arrow function
reduce((accumulator, currentValue) => { ... } )
reduce((accumulator, currentValue, index) => { ... } )
reduce((accumulator, currentValue, index, array) => { ... } )
reduce((accumulator, currentValue, index, array) => { ... }, initialValue)

// Callback function
reduce(callbackFn)
reduce(callbackFn, initialValue)

// Inline callback function
reduce(function callbackFn(accumulator, currentValue) { ... })
reduce(function callbackFn(accumulator, currentValue, index) { ... })
reduce(function callbackFn(accumulator, currentValue, index, array){ ... })
reduce(function callbackFn(accumulator, currentValue, index, array) { ... }, initialValue)

Popularity 9/10 Helpfulness 1/10 Language javascript

Source: developer.mozilla.org

Tags: javascript

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Contributed on May 22 2021

Annoyed Antelope

0 Answers Avg Quality 2/10

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reduce

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// Array.prototype.reduce()

const array1 = [1, 2, 3, 4];
const reducer = (accumulator, currentValue) => accumulator + currentValue;

// 1 + 2 + 3 + 4
console.log(array1.reduce(reducer));
// expected output: 10

// 5 + 1 + 2 + 3 + 4
console.log(array1.reduce(reducer, 5));
// expected output: 15

Popularity 10/10 Helpfulness 3/10 Language javascript

Source: Grepper

Tags: javascript j

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Contributed on Oct 01 2020

The Bowtie Bandit

0 Answers Avg Quality 2/10

reduce

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var sum = _.reduce([1, 2, 3], function(memo, num){ return memo + num; }, 0);
=> 6

Popularity 10/10 Helpfulness 2/10 Language javascript

Source: underscorejs.org

Tags: javascript j

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Contributed on Apr 27 2021

Yucky Yacare

0 Answers Avg Quality 2/10

reducer

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const reverse = (string) => {
  return string
    .split('')
    .reverse()
    .join('')
}

const average = (array) => {
  const reducer = (sum, item) => {
    return sum + item
  }

  return array.reduce(reducer, 0) / array.length
}

module.exports = {
  reverse,
  average,
}

Popularity 8/10 Helpfulness 2/10 Language javascript

Source: fullstackopen.com

Tags: javascript j

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Contributed on Nov 24 2022

Danilo Batson

0 Answers Avg Quality 2/10

Reducer

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import jwt_decode from "jwt-decode";
const initState = {
  loading: false,
  signUpErrors: [],
  loginErrors: [],
  token: "",
  user: "",
};

const verifyToken = (token) => {
  const decodeToken = jwt_decode(token);
  const expireIn = new Date(decodeToken.exp * 1000);
  if (new Date() > expireIn) {
    localStorage.removeItem("MyToken");
  } else {
    return decodeToken;
  }
};
const token = localStorage.getItem("MyToken");
if (token) {
  const decoded = verifyToken(token);
  initState.token = token;
  const { userData } = decoded;
  initState.user = userData;
}
const AuthReducer = (state = initState, action) => {
  if (action.type === "SET_LOADER") {
    return { ...state, loading: true };
  } else if (action.type === "CLOSE_LOADER") {
    return { ...state, loading: false };
  } else if (action.type === "SIGNUP_ERRORS") {
    return { ...state, signUpErrors: action.signupError };
  } else if (action.type === "SET_TOKEN") {
    const decoded = verifyToken(action.token);
    const { userData } = decoded;
    return {
      ...state,
      token: action.token,
      user: userData,
      signUpErrors: "",
      loginErrors: "",
    };
  } else if (action.type === "LOGOUT") {
    return { ...state, token: "", user: "" };
  } else if (action.type === "LOGIN_ERRORS") {
    return { ...state, loginErrors: action.loginErrors };
  } else {
    return state;
  }
};
export default AuthReducer;

Popularity 8/10 Helpfulness 1/10 Language javascript

Source: Grepper

Tags: javascript j

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Contributed on Sep 11 2022

Umar code solver

0 Answers Avg Quality 2/10

REDUCER

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function createStore(reducer) {
  let state;

  function dispatch(action) {
    state = reducer(state, action);
    render();
  }

  function getState() {
    return state;
  }

  return {
    dispatch,
    getState,
  };
}

function reducer(state = { count: 0 }, action) {
  switch (action.type) {
    case "counter/increment":
      return { count: state.count + 1 };

    default:
      return state;
  }
}

function render() {
  let container = document.getElementById("container");
  container.textContent = store.getState().count;
}

let store = createStore(reducer); // createStore takes the reducer as an argument
store.dispatch({ type: "@@INIT" });
let button = document.getElementById("button");

button.addEventListener("click", () => {
  store.dispatch({ type: "counter/increment" });
});

Popularity 8/10 Helpfulness 1/10 Language javascript

Source: moringa.instructure.com

Tags: javascript

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Contributed on Nov 28 2022

ABRAHAM NDICHU

0 Answers Avg Quality 2/10

reduce

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const arr = [5, 7, 1, 8, 4];const sum = arr.reduce(function(accumulator, currentValue) {  return accumulator + currentValue;});// prints 25console.log(sum);

Popularity 9/10 Helpfulness 1/10 Language javascript

Source: medium.com

Tags: javascript j

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Contributed on Aug 22 2021

Encouraging Elk

0 Answers Avg Quality 2/10

Reducer

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