kandi background
Explore Kits

Recoil | experimental state management library for React apps | Frontend Utils library

 by   facebookexperimental JavaScript Version: 0.7.2 License: MIT

 by   facebookexperimental JavaScript Version: 0.7.2 License: MIT

Download this library from

kandi X-RAY | Recoil Summary

Recoil is a JavaScript library typically used in Institutions, Learning, Administration, Public Services, User Interface, Frontend Utils, React Native, React applications. Recoil has no bugs, it has no vulnerabilities, it has a Permissive License and it has medium support. You can download it from GitHub.
Recoil is an experimental set of utilities for state management with React. Please see the website: https://recoiljs.org.
Support
Support
Quality
Quality
Security
Security
License
License
Reuse
Reuse

kandi-support Support

  • Recoil has a medium active ecosystem.
  • It has 16419 star(s) with 875 fork(s). There are 225 watchers for this library.
  • There were 2 major release(s) in the last 6 months.
  • There are 149 open issues and 629 have been closed. On average issues are closed in 28 days. There are 28 open pull requests and 0 closed requests.
  • It has a neutral sentiment in the developer community.
  • The latest version of Recoil is 0.7.2
Recoil Support
Best in #Frontend Utils
Average in #Frontend Utils
Recoil Support
Best in #Frontend Utils
Average in #Frontend Utils

quality kandi Quality

  • Recoil has 0 bugs and 0 code smells.
Recoil Quality
Best in #Frontend Utils
Average in #Frontend Utils
Recoil Quality
Best in #Frontend Utils
Average in #Frontend Utils

securitySecurity

  • Recoil has no vulnerabilities reported, and its dependent libraries have no vulnerabilities reported.
  • Recoil code analysis shows 0 unresolved vulnerabilities.
  • There are 0 security hotspots that need review.
Recoil Security
Best in #Frontend Utils
Average in #Frontend Utils
Recoil Security
Best in #Frontend Utils
Average in #Frontend Utils

license License

  • Recoil is licensed under the MIT License. This license is Permissive.
  • Permissive licenses have the least restrictions, and you can use them in most projects.
Recoil License
Best in #Frontend Utils
Average in #Frontend Utils
Recoil License
Best in #Frontend Utils
Average in #Frontend Utils

buildReuse

  • Recoil releases are available to install and integrate.
  • Installation instructions, examples and code snippets are available.
Recoil Reuse
Best in #Frontend Utils
Average in #Frontend Utils
Recoil Reuse
Best in #Frontend Utils
Average in #Frontend Utils
Top functions reviewed by kandi - BETA

kandi has reviewed Recoil and discovered the below as its top functions. This is intended to give you an instant insight into Recoil implemented functionality, and help decide if they suit your requirements.

  • Serializes an Item
  • Use RecalSynchronously to generate a cache URL for the REST API .
  • Serialize object .
  • Populate the dependency graph for a flow graph .
  • Initializes the content of the page
  • Set the store .
  • Connect to a new connection
  • use Reuse a Trip to export
  • Creates a new graph .
  • Creates a Connector .

Recoil Key Features

Recoil is an experimental state management library for React apps. It provides several capabilities that are difficult to achieve with React alone, while being compatible with the newest features of React.

Installation

copy iconCopydownload iconDownload
npm install recoil

What is the Syntax for Refetching a Query after a Local State Change in React

copy iconCopydownload iconDownload
  const { loading: loadingO, error: errorO, data: dataO, refetch: refetchO } = useQuery(GET_OWNER, {
  fetchPolicy: "network-only",
})
  const { loading: loadingM, error: errorM, data: dataM, refetch: refetchM } = useQuery(GET_MANAGER, {
  fetchPolicy: "network-only",
})

  const handleRefresh = () => {
    setRefresh(!refresh)
    if (role && id){
      if (role == "MANAGER"){
        refetchM()
      }
      if (role == "OWNER"){
        refetchO()
      }
    }
  }

How to add objects into array on specific position with setWayPoints() instead of wayPoints.splice? (useRecoilState)

copy iconCopydownload iconDownload
wayPoints.splice…
setWaypoints(wayPoints)
-----------------------
onPress={() => {
        wayPoints.splice(key + 1, 0, {
            coordinates: { longitude: 0, latitude: 0 },
            place: "",
            placeholder:
              key === wayPoints.length - 1
                ? "Destination"
                : "Waypoint",
       })
onPress={() => {
        let old = [...wayPoints];
        old.splice(key + 1, 0, {
           coordinates: { longitude: 0, latitude: 0 },
           place: "",
           placeholder:
           key === wayPoints.length - 1
             ? "Destination"
             : "Waypoint",
        });
        setWayPoints(old);
       }}
-----------------------
onPress={() => {
        wayPoints.splice(key + 1, 0, {
            coordinates: { longitude: 0, latitude: 0 },
            place: "",
            placeholder:
              key === wayPoints.length - 1
                ? "Destination"
                : "Waypoint",
       })
onPress={() => {
        let old = [...wayPoints];
        old.splice(key + 1, 0, {
           coordinates: { longitude: 0, latitude: 0 },
           place: "",
           placeholder:
           key === wayPoints.length - 1
             ? "Destination"
             : "Waypoint",
        });
        setWayPoints(old);
       }}
-----------------------
export const arrayAddItem = ({array, itemValue, index, position = 'after'}) => {
    const increasingCoeff = position === 'after' ? 1 : 0;
    return [
        ...array.slice(0, index + increasingCoeff),
        itemValue,
        ...array.slice(index + increasingCoeff)
    ];
};
const data = [
 {
  name: 'Yoda'
 },
 {
 name: 'Luke'
 },
 {
 name: 'Vader'
 }
]

console.log(arrayAddItem({
  array: data,
  itemValue: {name: 'Lea'},
  index: 1, // an index, after (or before) of which we add a new item to array
  // position is optional and default is 'after', but you can also add an items 'before' the specified index.
}))
[
 {
  name: 'Yoda'
 },
 {
 name: 'Luke'
 },
 {
 name: 'Lea'
 },
 {
 name: 'Vader'
 }
] 

export const arraySetValueByIndex = ({array, itemValue, index}) => {

    const startPart = array.slice(0, index);
    const endPart = array.slice(index + 1);
    return [
        ...startPart,
        itemValue,
        ...endPart
    ];
};
-----------------------
export const arrayAddItem = ({array, itemValue, index, position = 'after'}) => {
    const increasingCoeff = position === 'after' ? 1 : 0;
    return [
        ...array.slice(0, index + increasingCoeff),
        itemValue,
        ...array.slice(index + increasingCoeff)
    ];
};
const data = [
 {
  name: 'Yoda'
 },
 {
 name: 'Luke'
 },
 {
 name: 'Vader'
 }
]

console.log(arrayAddItem({
  array: data,
  itemValue: {name: 'Lea'},
  index: 1, // an index, after (or before) of which we add a new item to array
  // position is optional and default is 'after', but you can also add an items 'before' the specified index.
}))
[
 {
  name: 'Yoda'
 },
 {
 name: 'Luke'
 },
 {
 name: 'Lea'
 },
 {
 name: 'Vader'
 }
] 

export const arraySetValueByIndex = ({array, itemValue, index}) => {

    const startPart = array.slice(0, index);
    const endPart = array.slice(index + 1);
    return [
        ...startPart,
        itemValue,
        ...endPart
    ];
};
-----------------------
export const arrayAddItem = ({array, itemValue, index, position = 'after'}) => {
    const increasingCoeff = position === 'after' ? 1 : 0;
    return [
        ...array.slice(0, index + increasingCoeff),
        itemValue,
        ...array.slice(index + increasingCoeff)
    ];
};
const data = [
 {
  name: 'Yoda'
 },
 {
 name: 'Luke'
 },
 {
 name: 'Vader'
 }
]

console.log(arrayAddItem({
  array: data,
  itemValue: {name: 'Lea'},
  index: 1, // an index, after (or before) of which we add a new item to array
  // position is optional and default is 'after', but you can also add an items 'before' the specified index.
}))
[
 {
  name: 'Yoda'
 },
 {
 name: 'Luke'
 },
 {
 name: 'Lea'
 },
 {
 name: 'Vader'
 }
] 

export const arraySetValueByIndex = ({array, itemValue, index}) => {

    const startPart = array.slice(0, index);
    const endPart = array.slice(index + 1);
    return [
        ...startPart,
        itemValue,
        ...endPart
    ];
};
-----------------------
export const arrayAddItem = ({array, itemValue, index, position = 'after'}) => {
    const increasingCoeff = position === 'after' ? 1 : 0;
    return [
        ...array.slice(0, index + increasingCoeff),
        itemValue,
        ...array.slice(index + increasingCoeff)
    ];
};
const data = [
 {
  name: 'Yoda'
 },
 {
 name: 'Luke'
 },
 {
 name: 'Vader'
 }
]

console.log(arrayAddItem({
  array: data,
  itemValue: {name: 'Lea'},
  index: 1, // an index, after (or before) of which we add a new item to array
  // position is optional and default is 'after', but you can also add an items 'before' the specified index.
}))
[
 {
  name: 'Yoda'
 },
 {
 name: 'Luke'
 },
 {
 name: 'Lea'
 },
 {
 name: 'Vader'
 }
] 

export const arraySetValueByIndex = ({array, itemValue, index}) => {

    const startPart = array.slice(0, index);
    const endPart = array.slice(index + 1);
    return [
        ...startPart,
        itemValue,
        ...endPart
    ];
};

react-router-dom <Routes> and <BrowserRouter> errors

copy iconCopydownload iconDownload
import { BrowserRouter, BrowserRouter as Routes, Route } from 'react-router-dom';
import { BrowserRouter, Routes, Route } from 'react-router-dom';
-----------------------
import { BrowserRouter, BrowserRouter as Routes, Route } from 'react-router-dom';
import { BrowserRouter, Routes, Route } from 'react-router-dom';
-----------------------
import { BrowserRouter, BrowserRouter as Routes, Route } from 'react-router-dom';
import { BrowserRouter as Routes, Route } from 'react-router-dom';
-----------------------
import { BrowserRouter, BrowserRouter as Routes, Route } from 'react-router-dom';
import { BrowserRouter as Routes, Route } from 'react-router-dom';

Delete an element from an array (RecoilJS)

copy iconCopydownload iconDownload
setValue((prev) => prev.filter((value, index) => index !== prev.length - 1));
import { valueState as valueStateAtom } from '../../atoms/Atoms';
import { useSetRecoilState } from 'recoil';
const setValue = useSetRecoilState(valueStateAtom);


// The function that handles the onChange event of the form
const setNewValue = (v) => {
   if (v !== '') {
      const valueNumber = parseFloat(v);
      if (!isNaN(valueNumber)) {
         setPageValueChanged(true);
         pageValue = valueNumber;
         // The value gets added to valueState
         setValue((prev) => prev.concat({ valueNumber, cardID }));
      } else {
          setPageValueChanged(false);
      }
   } else {
       setPageValueChanged(false);
       setValue((prev) => prev.filter((value, index) => index !== prev.length - 1));
    }
};
setValue((prev) => prev.concat([{ valueNumber, cardID }]));
-----------------------
setValue((prev) => prev.filter((value, index) => index !== prev.length - 1));
import { valueState as valueStateAtom } from '../../atoms/Atoms';
import { useSetRecoilState } from 'recoil';
const setValue = useSetRecoilState(valueStateAtom);


// The function that handles the onChange event of the form
const setNewValue = (v) => {
   if (v !== '') {
      const valueNumber = parseFloat(v);
      if (!isNaN(valueNumber)) {
         setPageValueChanged(true);
         pageValue = valueNumber;
         // The value gets added to valueState
         setValue((prev) => prev.concat({ valueNumber, cardID }));
      } else {
          setPageValueChanged(false);
      }
   } else {
       setPageValueChanged(false);
       setValue((prev) => prev.filter((value, index) => index !== prev.length - 1));
    }
};
setValue((prev) => prev.concat([{ valueNumber, cardID }]));
-----------------------
setValue((prev) => prev.filter((value, index) => index !== prev.length - 1));
import { valueState as valueStateAtom } from '../../atoms/Atoms';
import { useSetRecoilState } from 'recoil';
const setValue = useSetRecoilState(valueStateAtom);


// The function that handles the onChange event of the form
const setNewValue = (v) => {
   if (v !== '') {
      const valueNumber = parseFloat(v);
      if (!isNaN(valueNumber)) {
         setPageValueChanged(true);
         pageValue = valueNumber;
         // The value gets added to valueState
         setValue((prev) => prev.concat({ valueNumber, cardID }));
      } else {
          setPageValueChanged(false);
      }
   } else {
       setPageValueChanged(false);
       setValue((prev) => prev.filter((value, index) => index !== prev.length - 1));
    }
};
setValue((prev) => prev.concat([{ valueNumber, cardID }]));

Dynamic atom keys in Recoil

copy iconCopydownload iconDownload
let atoms = {}
const textState = (key: string, defaultValue: string = "") => {
   //if the current key is not added, should add a new atom to `atoms`
   if(!atoms[key]) {
      atoms[key] = atom({
         key,
         default: defaultValue
      })
   }

   //reuse the existing atom which is added before with the same key
   return atoms[key];
}
-----------------------
body { font-family: sans-serif; }
input[type="text"] { font-size: 1rem; padding: 0.5rem; }
<div id="root"></div><script src="https://unpkg.com/react@17.0.2/umd/react.development.js"></script><script src="https://unpkg.com/react-dom@17.0.2/umd/react-dom.development.js"></script><script src="https://unpkg.com/recoil@0.6.1/umd/recoil.min.js"></script><script src="https://unpkg.com/@babel/standalone@7.17.7/babel.min.js"></script><script>Babel.registerPreset('tsx', {presets: [[Babel.availablePresets['typescript'], {allExtensions: true, isTSX: true}]]});</script>
<script type="text/babel" data-type="module" data-presets="tsx,react">

// import ReactDOM from 'react-dom';
// import type {ReactElement} from 'react';
// import {atomFamily, RecoilRoot, useRecoilState} from 'recoil';

// This Stack Overflow snippet demo uses UMD modules instead of the above import statments
const {atomFamily, RecoilRoot, useRecoilState} = Recoil;

const textInputState = atomFamily<string, [id: string, defaultValue?: string]>({
  key: 'textInput',
  default: ([, defaultValue]) => defaultValue ?? '',
});

type TextInputProps = {
  id: string;
  defaultValue?: string;
};

function TextInput ({defaultValue = '', id}: TextInputProps): ReactElement {
  const [value, setValue] = useRecoilState(textInputState([id, defaultValue]));

  return (
    <div>
      <input
        type="text"
        onChange={ev => setValue(ev.target.value)}
        placeholder={defaultValue}
        {...{value}}
      />
    </div>
  );
}

function App (): ReactElement {
  const fields = [
    { id: 'foo', type: 'text', value: 'bar' },
    { id: 'hello', type: 'text', value: 'world' },
  ];

  return (
    <RecoilRoot>
      <h1>Custom defaults using atomFamily</h1>
      {fields.map(({id, value: defaultValue}) => (
        <TextInput key={id} {...{defaultValue, id}} />
      ))}
    </RecoilRoot>
  );
}

ReactDOM.render(<App />, document.getElementById('root'));

</script>
-----------------------
body { font-family: sans-serif; }
input[type="text"] { font-size: 1rem; padding: 0.5rem; }
<div id="root"></div><script src="https://unpkg.com/react@17.0.2/umd/react.development.js"></script><script src="https://unpkg.com/react-dom@17.0.2/umd/react-dom.development.js"></script><script src="https://unpkg.com/recoil@0.6.1/umd/recoil.min.js"></script><script src="https://unpkg.com/@babel/standalone@7.17.7/babel.min.js"></script><script>Babel.registerPreset('tsx', {presets: [[Babel.availablePresets['typescript'], {allExtensions: true, isTSX: true}]]});</script>
<script type="text/babel" data-type="module" data-presets="tsx,react">

// import ReactDOM from 'react-dom';
// import type {ReactElement} from 'react';
// import {atomFamily, RecoilRoot, useRecoilState} from 'recoil';

// This Stack Overflow snippet demo uses UMD modules instead of the above import statments
const {atomFamily, RecoilRoot, useRecoilState} = Recoil;

const textInputState = atomFamily<string, [id: string, defaultValue?: string]>({
  key: 'textInput',
  default: ([, defaultValue]) => defaultValue ?? '',
});

type TextInputProps = {
  id: string;
  defaultValue?: string;
};

function TextInput ({defaultValue = '', id}: TextInputProps): ReactElement {
  const [value, setValue] = useRecoilState(textInputState([id, defaultValue]));

  return (
    <div>
      <input
        type="text"
        onChange={ev => setValue(ev.target.value)}
        placeholder={defaultValue}
        {...{value}}
      />
    </div>
  );
}

function App (): ReactElement {
  const fields = [
    { id: 'foo', type: 'text', value: 'bar' },
    { id: 'hello', type: 'text', value: 'world' },
  ];

  return (
    <RecoilRoot>
      <h1>Custom defaults using atomFamily</h1>
      {fields.map(({id, value: defaultValue}) => (
        <TextInput key={id} {...{defaultValue, id}} />
      ))}
    </RecoilRoot>
  );
}

ReactDOM.render(<App />, document.getElementById('root'));

</script>

Looking for a pattern to normalize state in Recoil without losing the benefit of Suspense

copy iconCopydownload iconDownload
<div id="root"></div><script src="https://unpkg.com/react@17.0.2/umd/react.development.js"></script><script src="https://unpkg.com/react-dom@17.0.2/umd/react-dom.development.js"></script><script src="https://unpkg.com/recoil@0.6.1/umd/recoil.min.js"></script><script src="https://unpkg.com/@babel/standalone@7.17.6/babel.min.js"></script><script>Babel.registerPreset('tsx', {presets: [[Babel.availablePresets['typescript'], {allExtensions: true, isTSX: true}]]});</script>
<script type="text/babel" data-type="module" data-presets="tsx,react">

// import ReactDOM from 'react-dom';
// import {default as React, Suspense, useEffect, useState, type ReactElement, type ReactNode} from 'react';
// import {atomFamily, RecoilRoot, useRecoilValue} from 'recoil';

// This Stack Overflow snippet demo uses UMD modules instead of the above import statments
const {Suspense, useEffect, useState} = React;
const {atomFamily, RecoilRoot, useRecoilValue} = Recoil;

type Book = {
  author: string;
  id: string;
  title: string;
};


// Database simulation:

// The simulated database
const db = new Map<string, Book>();
// Scraped from https://www.penguin.co.uk/articles/2018/100-must-read-classic-books.html#100
(JSON.parse(`[{"author":"Jane Austen","title":"Pride and Prejudice","id":"BnuQKALlW6B6sZNU4bdaB"},{"author":"Harper Lee","title":"To Kill a Mockingbird","id":"UM3ms9hlnTbEmx44JknKc"},{"author":"F. Scott Fitzgerald","title":"The Great Gatsby","id":"hBl51iaNCQ8qZw5iec8hD"},{"author":"Gabriel García Márquez","title":"One Hundred Years of Solitude","id":"CC9hIXCdEHR0beJlbMF_y"},{"author":"Truman Capote","title":"In Cold Blood","id":"l0iJfZNmNBfioHDnHARWQ"},{"author":"Jean Rhys","title":"Wide Sargasso Sea","id":"D0UY9kmrV6HbqlIMspVwn"},{"author":"Aldous Huxley","title":"Brave New World","id":"rK2ks0GbZBDQPns-ZDEyW"},{"author":"Dodie Smith","title":"I Capture The Castle","id":"flTB4dqKfg1PWcUI6KtH2"},{"author":"Charlotte Bronte","title":"Jane Eyre","id":"3x-S6EsNUTZ5l_sESamF_"},{"author":"Fyodor Dostoevsky","title":"Crime and Punishment","id":"ntH3G63fMVKUud6rRhDbY"},{"author":"Donna Tartt","title":"The Secret History","id":"ubrxbS1-7NEr_lml6I8Q3"},{"author":"Jack London","title":"The Call of the Wild","id":"friqBlVlEY3eg2cpkgUET"},{"author":"John Wyndham","title":"The Chrysalids","id":"wRMQGG1QYaeVXXP_ghl-x"},{"author":"Jane Austen","title":"Persuasion","id":"YoMqTM9PhAfctMBqSdz6P"},{"author":"Herman Melville","title":"Moby-Dick","id":"Kd0Oggfkf5AQPGBqpw_iE"},{"author":"C.S. Lewis","title":"The Lion, the Witch and the Wardrobe","id":"-jD0Ujt-r54xbKZ_7Jv59"},{"author":"Virginia Woolf","title":"To the Lighthouse","id":"1TJQYcP6_hwm2syHUH8Dv"},{"author":"Elizabeth Bowen","title":"The Death of the Heart","id":"dl1qbyM0cHdmYUHKhTyZk"},{"author":"Thomas Hardy","title":"Tess of the d'Urbervilles","id":"_i6SLfaMpXRuhVqEH5Jhp"},{"author":"Mary Shelley","title":"Frankenstein","id":"ZPL-swiUogF-_gdabf9qv"},{"author":"Mikhail Bulgakov","title":"The Master and Margarita","id":"x0pw07n3o2KljHZM11isw"},{"author":"L. P. Hartley","title":"The Go-Between","id":"l0jHUSb4bY64k-l9Qed5Z"},{"author":"Ken Kesey","title":"One Flew Over the Cuckoo's Nest","id":"SCKsZTWD2QMsNomUie_Vf"},{"author":"George Orwell","title":"Nineteen Eighty-Four","id":"JscV73l2tSdm5W4kZSvZn"},{"author":"Thomas Mann","title":"Buddenbrooks","id":"f0XqwYfsWJ-w9J18b5FCD"},{"author":"John Steinbeck","title":"The Grapes of Wrath","id":"OnXfkmQEAL7sSQ3PgSV9z"},{"author":"Toni Morrison","title":"Beloved","id":"n3_aZgBlQkphqPTvmJGr6"},{"author":"P. G. Wodehouse","title":"The Code of the Woosters","id":"TzD6k5flXf8HMdfgSacMT"},{"author":"Bram Stoker","title":"Dracula","id":"_WPS6E_6uXVKWX0r2Sop6"},{"author":"J. R. R. Tolkien","title":"The Lord of the Rings","id":"bIzyksKmB0plzGwWI6h7l"},{"author":"Mark Twain","title":"The Adventures of Huckleberry Finn","id":"ctQZfUT_tsujBCdYkv4HA"},{"author":"Charles Dickens","title":"Great Expectations","id":"ULj9NAatfo8tCCe39YZTY"},{"author":"Joseph Heller","title":"Catch-22","id":"bOOUBZK7oFVDRrevxApvN"},{"author":"Edith Wharton","title":"The Age of Innocence","id":"ZJ8y0y-BbnaH5A9TulxgN"},{"author":"Chinua Achebe","title":"Things Fall Apart","id":"eahxg8sFYsudKEl9hocJv"},{"author":"George Eliot","title":"Middlemarch","id":"TLNUskf7TspVe3AOEV4nX"},{"author":"Salman Rushdie","title":"Midnight's Children","id":"0_DeHTlQpW4ffy-liu2R-"},{"author":"Homer","title":"The Iliad","id":"D9cyf2yCAwhnASsxGxtTd"},{"author":"William Makepeace Thackeray","title":"Vanity Fair","id":"YmXxLcLMYmuFkp39Q1aAa"},{"author":"Evelyn Waugh","title":"Brideshead Revisited","id":"p3D_ZtFdhT2Eytv7swOAZ"},{"author":"J.D. Salinger","title":"The Catcher in the Rye","id":"3Sf-5_lsdGVeiWJeSZZQI"},{"author":"Lewis Carroll","title":"Alice’s Adventures in Wonderland","id":"TJJ6J8OHF5PRaiHLEcPdq"},{"author":"George Eliot","title":"The Mill on the Floss","id":"F6S5twxijUt7cSvuoSeKH"},{"author":"Anthony Trollope","title":"Barchester Towers","id":"0jYVd6dhiSF1tJYuIU8az"},{"author":"James Baldwin","title":"Another Country","id":"xRjGwu2vOQObLqbFccnw_"},{"author":"Victor Hugo","title":"Les Miserables","id":"GR24l64YVjFagi-SB1Y-H"},{"author":"Roald Dahl","title":"Charlie and the Chocolate Factory","id":"CAoAoALD3T8wxX0Eevabi"},{"author":"S. E. Hinton","title":"The Outsiders","id":"XYhNMkKTKsh9aNGh24fvZ"},{"author":"Alexandre Dumas","title":"The Count of Monte Cristo","id":"Igcm-Wxq2Uf8vKjBr-D7j"},{"author":"James Joyce","title":"Ulysses","id":"GiianKDQPQVTIaFoFhy6H"},{"author":"John Steinbeck","title":"East of Eden","id":"belUus-Sta74zWfjTiuMW"},{"author":"Fyodor Dostoyevsky","title":"The Brothers Karamazov","id":"wp9JOJ0B8lKmxG0siRuR4"},{"author":"Vladimir Nabokov","title":"Lolita","id":"tvnoXyLsd-PtVmiwZLnM8"},{"author":"Frances Hodgson Burnett","title":"The Secret Garden","id":"VZyJI95JMwkj4rJOJbzzn"},{"author":"Evelyn Waugh","title":"Scoop","id":"QYgFDNe1S0x5V_ub-Vc-S"},{"author":"Charles Dickens","title":"A Tale of Two Cities","id":"G0FUeqOiLuNnBNEr4XPD2"},{"author":"George Grossmith and Weedon Grossmith","title":"Diary of a Nobody","id":"PLi0tMjdAZI54P3U02B2N"},{"author":"Leo Tolstoy","title":"Anna Karenina","id":"E0OlPZ9F8Z3rsEmGihW-0"},{"author":"Alessandro Manzoni","title":"The Betrothed","id":"hPHRkfbcMUeJUejXy7spa"},{"author":"Virginia Woolf","title":"Orlando","id":"FSzptVHC-ICRl0tlPhS-O"},{"author":"Ayn Rand","title":"Atlas Shrugged","id":"CdzIlNo9jp5CDAP5BEwLi"},{"author":"H. G. Wells","title":"The Time Machine","id":"dQn4oEs0hqgfuaFR13S-o"},{"author":"Sun-Tzu","title":"The Art of War","id":"LZwoJLEtLv4Dx2QnUBvwM"},{"author":"John Galsworthy","title":"The Forsyte Saga","id":"p9hOPd4gC7PKX9bbp8JVZ"},{"author":"John Steinbeck","title":"Travels with Charley","id":"c3LtQi5_p-XSF2JSfPOjq"},{"author":"Henry Miller","title":"Tropic of Cancer","id":"iFILNdFzltGXugvwpUjSS"},{"author":"D. H. Lawrence","title":"Women in Love","id":"gYf7mAVCM_SX5e3NDwc9y"},{"author":"Paul Scott","title":"Staying On","id":"gZYOkRz4APlcDGNH5onYD"},{"author":"Kenneth Grahame","title":"The Wind in the Willows","id":"epTCvsskVjm3vnomZCPRw"},{"author":"Willa Cather","title":"My Ántonia","id":"wWoBKiKEQ6KpwigH2RtMQ"},{"author":"Emily Brontë","title":"Wuthering Heights","id":"8Feh8HOHmfFZXwhkclUmj"},{"author":"Patrick Süskind","title":"Perfume","id":"JJntMbxqiKvuryEO82VAX"},{"author":"Leo Tolstoy","title":"War and Peace","id":"CPfDnuxwDYeLvzqLPJzXJ"},{"author":"Somerset Maugham","title":"Of Human Bondage","id":"h4IW8mQUmLTJ9uyfVe2qe"},{"author":"Charles Dickens","title":"Bleak House","id":"NPkSH3PieOiq_gE0svlxB"},{"author":"Honoré de Balzac","title":"Lost Illusions","id":"0Ckpg5CMzAYIUbCjWZXPt"},{"author":"Kurt Vonnegut","title":"Breakfast of Champions","id":"Lydqp4eMEkYL3YVkg0krr"},{"author":"Charles Dickens","title":"A Christmas Carol","id":"ApOCi4LPkvoN2R47C1frw"},{"author":"George Eliot","title":"Silas Marner","id":"5CUwpkfRyLjTBBmJHc0Ic"},{"author":"Virginia Woolf","title":"Mrs Dalloway","id":"9Pdh2b7of93bT-Xp1egBB"},{"author":"Louisa May Alcott","title":"Little Women","id":"095_BrLfJD-pI2nOtqJII"},{"author":"Iris Murdoch","title":"The Sea, The Sea","id":"5V4JjZvcqWhiLTdpYjc5r"},{"author":"Mario Puzo","title":"The Godfather","id":"cK1YXvMZ4xRZVFyQDKcG3"},{"author":"Franz Kafka","title":"The Castle","id":"bV5hrXcPzSfPhLPITPlj7"},{"author":"Robert Graves","title":"I, Claudius","id":"2FFaA72V-Pp74A6mZajR7"},{"author":"J.M. Barrie","title":"Peter Pan","id":"6vwOgrhQTp60ISU-KIxoQ"},{"author":"John Kennedy Toole","title":"A Confederacy of Dunces","id":"zZwqEBfR72Ht_Uwa25blx"},{"author":"W. Somerset Maugham","title":"The Razor's Edge","id":"uL-eIpi0xf11BDmpxfxYQ"},{"author":"Flora Thompson","title":"Lark Rise to Candleford","id":"wISh6hRf-rIOXzGV9pReU"},{"author":"Thomas Hardy","title":"The Return of the Native","id":"ouX9cTm5gF36zX95SfOaE"},{"author":"James Joyce","title":"A Portrait of the Artist as a Young Man","id":"dX6B1SNtZH_Kij9ZdQ3cx"},{"author":"Joseph Conrad","title":"Heart of Darkness","id":"uQk4tRerBAtFtZwh-Xyx3"},{"author":"Elizabeth Gaskell","title":"North and South","id":"8bRGCx_5Pk3i4-RNXlley"},{"author":"Margaret Atwood","title":"The Handmaid's Tale","id":"E0tJsPHR6JnnoQ9UKtKHE"},{"author":"Irene Nemirovsky","title":"Suite Francaise","id":"0lq5lUjV7A0SMvUF-ucmv"},{"author":"Alexander Solzhenitsyn","title":"One Day in the Life of Ivan Denisovich","id":"3Qik1V1BoZZDyPphzedzb"},{"author":"Jonathan Coe","title":"What A Carve Up!","id":"UhNcCOU_TzUDbTOvxzUPU"},{"author":"Robert Pirsig","title":"Zen and the Art of Motorcycle Maintenance","id":"Alpfu_s-Ee8L6G1s7-WD2"},{"author":"Fyodor Dostoyevsky","title":"White Nights","id":"Lr3KmI-pOxer7rSsF8MhE"},{"author":"Charles Dickens","title":"Hard Times","id":"OrxuKkQoEgg2cSDQcyyPc"}]`) as Book[])
  .forEach(book => db.set(book.id, book));

function delay (ms: number): Promise<void> {
  return new Promise(resolve => setTimeout(resolve, ms));
}

function randomInt (min = 0, max = 1): number {
  return Math.floor(Math.random() * (max - min + 1)) + min;
}

// Simulated db methods
const booksDb = {
  async getOne (id: string): Promise<Book | undefined> {
    return (await this.getMany([id]))[0];
  },
  async getMany (ids: string[]): Promise<(Book | undefined)[]> {
    await delay(randomInt(50, 500));
    return ids.map(id => {
      const book = db.get(id);
      // Simulate getting a copy every time
      return book ? {...book} : undefined;
    });
  },
};


// Recoil state:

// Cached results
const booksCache = new Map<string, Book>();

// Just for this demo, maintain a query count
let dbQueryCount = 0;

// Inspired by effector, I prefix recoil-related variables with $ to simplify naming
const $book = atomFamily<Book | undefined, string>({
  key: 'book',
  default: async (id) => {
    // Return from cache, querying db only if unavailable
    if (!booksCache.has(id)) {
      dbQueryCount += 1;
      const book = await booksDb.getOne(id);
      if (book) booksCache.set(id, book);
    }
    return booksCache.get(id);
  },
});

const $books = atomFamily<(Book | undefined)[], string[]>({
  key: 'books',
  default: async (ids) => {
    const books: (Book | undefined)[] = [];
    const available: [index: number, id: string][] = [];
    const unavailable: [index: number, id: string][] = [];

    // Split query into collections of available in cache or not
    for (const [index, id] of ids.entries()) {
      const isAvailable = booksCache.has(id);
      (isAvailable ? available : unavailable).push([index, id]);
    }

    // Get cached results
    for (const [index, id] of available) {
      books[index] = booksCache.get(id);
    }

    // Query the remaining with a single network request
    dbQueryCount += 1;
    const booksFromDb = await booksDb.getMany(unavailable.map(([, id]) => id));

    // Update cache and finalize
    for (const [index, id] of unavailable) {
      const book = booksFromDb[index];
      if (book) booksCache.set(id, book);
      books[index] = booksCache.get(id);
    }

    return books;
  },
});


// Components:

function BookComponent ({book}: { book: Book | undefined }): ReactElement {
  if (!book) return (<div>Book is not availble</div>);
  return (
    <div>
      <em>{book.title}</em> by <span>{book.author}</span>
    </div>
  );
}

function BookFromId ({id}: { id: string }): ReactElement {
  const book = useRecoilValue($book(id));
  return <BookComponent {...{book}} />;
}

function BookCollection ({ids}: { ids: string[]; }): ReactElement {
  // To see these loaded individually, uncomment the following lines:

  // return (<div>{ids.map((id, index) => (
  //   <BookFromId {...{id, key: `${index}-${id}`}} />
  // ))}</div>);

  const books = useRecoilValue($books(ids));

  return (<div>{books.map((book, index) => (
    <BookComponent {...{book, key: `${index}-${book?.id}`}} />
  ))}</div>);
}

function LoadingDiv ({children}: { children?: ReactNode }): ReactElement {
  return (<div>{children}</div>);
}

const collections: [title: string, ids: string[]][] = [
  ['Titles starting with A', ['ApOCi4LPkvoN2R47C1frw', 'zZwqEBfR72Ht_Uwa25blx', 'dX6B1SNtZH_Kij9ZdQ3cx', 'G0FUeqOiLuNnBNEr4XPD2', 'TJJ6J8OHF5PRaiHLEcPdq', 'E0OlPZ9F8Z3rsEmGihW-0', 'xRjGwu2vOQObLqbFccnw_', 'CdzIlNo9jp5CDAP5BEwLi']],
  ['Titles starting with B', ['0jYVd6dhiSF1tJYuIU8az', 'n3_aZgBlQkphqPTvmJGr6', 'NPkSH3PieOiq_gE0svlxB', 'rK2ks0GbZBDQPns-ZDEyW', 'Lydqp4eMEkYL3YVkg0krr', 'p3D_ZtFdhT2Eytv7swOAZ', 'f0XqwYfsWJ-w9J18b5FCD']],
  ['Titles starting with C', ['bOOUBZK7oFVDRrevxApvN', 'CAoAoALD3T8wxX0Eevabi', 'ntH3G63fMVKUud6rRhDbY']],
];

type OrPromise<T> = T | Promise<T>;

function useLazyValue <T>(initialValue: T, producer: () => OrPromise<T>): T {
  const [value, setValue] = useState(initialValue);

  const updateValue = async () => {
    const result = await producer();
    if (value !== result) setValue(result);
  };

  useEffect(() => void updateValue());
  return value;
}

function App (): ReactElement {
  const [collectionIndex, setCollectionIndex] = useState(0);
  const collectionIds = collections[collectionIndex]![1];
  const queryCount = useLazyValue(0, () => dbQueryCount);

  const booksLoading = <LoadingDiv>The collection is loading...</LoadingDiv>;

  return (
    <div style={{
      display: 'flex',
      flexDirection: 'column',
      gap: '0.5rem',
      fontFamily: 'sans-serif',
    }}>
      <h1>Recoil book cache</h1>

      <div>Query count: {queryCount}</div>

      <label>
        <div>Select a collection:</div>
        <select
          onChange={ev => setCollectionIndex(Number(ev.target.value))}
          value={collectionIndex}
        >{collections.map(([title], index) => (
          <option key={`${index}-${title}`} value={index}>{title}</option>
        ))}</select>
      </label>

      <Suspense fallback={booksLoading}>
        <BookCollection ids={collectionIds} />
      </Suspense>
    </div>
  );
}

function AppRoot (): ReactElement {
  return (
    <RecoilRoot>
      <App />
    </RecoilRoot>
  );
}

ReactDOM.render(<AppRoot />, document.getElementById('root'));


</script>

React Native Firebase onAuthStateChanged returns user after signOut

copy iconCopydownload iconDownload
useEffect(() => {
    const unsubscribe = auth().onAuthStateChanged(onAuthStateChanged);

    return () => unsubscribe();
}, []);

How can I set a nested recoil state?

copy iconCopydownload iconDownload
const handleClick = async (e) => {
  e.preventDefault();

  setList(list => ({
    ...list,
    plans: [
      ...list.plans,
      {
        plan: input.plan,
        price: parseInt(input.price),
      },
    ],
  }));

  setInput({plan: "", price: ""});
};

Script is returning a syntax error on blank line

copy iconCopydownload iconDownload
local l_s=nr_s*(m_l//2)
local l_s = nr_s * math.floor(m_l / 2)
-----------------------
local l_s=nr_s*(m_l//2)
local l_s = nr_s * math.floor(m_l / 2)

Why is the assigned object not being written too?

copy iconCopydownload iconDownload
setProposal((proposal) => {
    let mutable = proposal;
    console.log("before", mutable);

    mutable = {
      ...mutable,
      scopes: mutable.scopes.map((scope) => ({
        ...scope,
        assemblies: scope.assemblies.map((assembly) => ({
          ...assembly,
          items: assembly.items.map((item) => {
            if (item.id === id) {
              return {
                ...item,
                ...params
              };
            } else {
              return item;
            }
          })
        }))
      }))
    };

    console.log("after", mutable);

    return mutable;
  });

Community Discussions

Trending Discussions on Recoil
  • How to set map key in typescript?
  • I put children in the common modal, but it doesn't work
  • What is the Syntax for Refetching a Query after a Local State Change in React
  • Error: Should have a queue. This is likely a bug in React. Please file an issue. - react-query
  • How to add objects into array on specific position with setWayPoints() instead of wayPoints.splice? (useRecoilState)
  • react-router-dom &lt;Routes&gt; and &lt;BrowserRouter&gt; errors
  • Delete an element from an array (RecoilJS)
  • Dynamic atom keys in Recoil
  • Looking for a pattern to normalize state in Recoil without losing the benefit of Suspense
  • Variable Keeps Changing its Own Value to be Every View Prop
Trending Discussions on Recoil

QUESTION

How to set map key in typescript?

Asked 2022-Apr-07 at 07:28

I am using reactjs by applying typescript. I am using in the map, but if I give a unique numer value to the key, an error occurs. Anyone know why?

atom.js

export interface Person {
  id: Number;
  num: string;
  name: string;
  img: string;
}
....

export const filteredPersonList = selector({
  key: "filteredPersonListSelector",
  get: ({ get }) => {
    const filterType = get(filteredType);
    const filterSearch = get(filteredSearch);
    const person = get(person);

    if (filterSearch.length > 0 && filterType !== "all") {
      const filteredList = person
        .filter((p) =>p.name.includes(filterSearch))
        .filter((p) =>p.type.includes(filterType));
      return filteredList;
    } else if (filterSearch.length > 0 && filterType === "all") {

      return filteredList;
    } else if (filterType !== "all") {

      return filteredList;
    } else {
      return person;
    }
  },
});
import { Link } from "react-router-dom";
import { useRecoilState, useRecoilValue, useSetRecoilState } from "recoil";
import styled from "styled-components";
import {
filteredPersonList
} from "../store/atom";

interface TypeItemComp {
  currentType: boolean;
}

export default function Main() {
  const [filterType, setFilterType] = useRecoilState(filteredType);
  const people = useRecoilValue(filteredPersonList);

  return (
    <MainContainer>
      <PersonContainer>
        {people.map((p) => (
          <Link key={p.id} to={`/detail/${p.id}`}>. //an error occurs here

          </Link>
        ))}
      </PersonContainer>
    </MainContainer>
  );
}

The warning is as below.

Type 'Number' is not assignable to type 'Key | null | undefined'. Type 'Number' is not assignable to type 'number'. 'number' is a primitive, but 'Number' is a wrapper object. Prefer using 'number' when possible.ts(2322) index.d.ts(138, 9): The expected type comes from property 'key' which is declared here on type 'IntrinsicAttributes & LinkProps & RefAttributes'

ANSWER

Answered 2022-Apr-07 at 07:28

Use number instead of Number. "Number" with a capital N isn't the datatype you're looking for. It even says so in the error message.

I know error messages may look overwhelming sometimes, especially when you're just starting out as a programmer. But most of the time, they're awesome.

You should try and make a habit of carefully READING the error messages you get, instead of just being alarmed by it.

Source https://stackoverflow.com/questions/71777945

Community Discussions, Code Snippets contain sources that include Stack Exchange Network

Vulnerabilities

No vulnerabilities reported

Install Recoil

The Recoil package lives in npm. To install the latest stable version, run the following command:.

Support

Development of Recoil happens in the open on GitHub, and we are grateful to the community for contributing bugfixes and improvements. Read below to learn how you can take part in improving Recoil.

DOWNLOAD this Library from

Find, review, and download reusable Libraries, Code Snippets, Cloud APIs from
over 430 million Knowledge Items
Find more libraries
Reuse Solution Kits and Libraries Curated by Popular Use Cases

Save this library and start creating your kit

Share this Page

share link
Compare Frontend Utils Libraries with Highest Support
Compare Frontend Utils Libraries with Highest Quality
Compare Frontend Utils Libraries with Highest Security
Compare Frontend Utils Libraries with Permissive License
Find, review, and download reusable Libraries, Code Snippets, Cloud APIs from
over 430 million Knowledge Items
Find more libraries
Reuse Solution Kits and Libraries Curated by Popular Use Cases

Save this library and start creating your kit

  • © 2022 Open Weaver Inc.