{"componentChunkName":"component---src-templates-tag-js","path":"/tags/recoil/","result":{"data":{"site":{"siteMetadata":{"title":"LoginRadius Blog"}},"allMarkdownRemark":{"totalCount":1,"edges":[{"node":{"fields":{"slug":"/engineering/recoiling-the-react/"},"html":"

Recoil js is another state management library for React.

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Though we already have Redux. Mobx, Context, but here we got a new light entry in the community.

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Why I am saying light you will figure it out at the end of this blog.

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Why Recoil

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Recoil concepts

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There are two major concepts:

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    \n
  1. Atoms
    2. \n
  2. Selectors
    3. \n
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Something new? Don't worry will understand this quickly.

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Atoms

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This is similar to how we use the useState hook in react. If you are new to react hooks, checkout react hooks guide.

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e.g.:

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 const [age, setAge] = useState(0);
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age : this will be used for state variable declaration.\nsetAge :this will be used for state variable updations.

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1. Let's start with binding root app with Recoil

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Now you need to make a few alterations in your app's root level, like the below snippet.

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RecoilRoot will behave like a global context provider that will share the global state to your app tree.

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Now update your older code snippet.

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ReactDOM.render( <AppPage />, document.getElementById("root"))
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to

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import { RecoilRoot } from "recoil";\n\nReactDOM.render( \n <RecoilRoot>\n    <AppPage />\n </RecoilRoot>, document.getElementById("root"))
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2. Set the Atom

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Recoil calls this part as atom, where we set the global key, value.

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import { atom } from "recoil";\n\nconst age = atom({\n  key: "age", \n  default: 0  // default global value for age key\n});
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Now this atom will be accessible throughout the app.

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3. use the atom

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Now update your older code snippet.

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 const [age, setAge] = useState(0);
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to

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import { useRecoilState } from 'recoil'\nconst [ageState, setAge] = useRecoilState(age);
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For a Larger view, here is Full Code

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import { atom,useRecoilState } from 'recoil'\n\nconst age = atom({\n  key: "age", \n  default: 0  // default global value for age key\n});\n\nexport const AgeCalculator = () => {\nconst [ageState, setAge] = useRecoilState(age);\n}
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Quite easy. Isn't it?\nNow let's move to another part selectors.

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Selectors

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This is similar to how Redux manages states.

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if a value can be derived/computed from the state, then we can skip re initialize of an another separate state key, for that use selectors.

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1. set the selectors

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In the below example, we are getting isChild value from age key, then we can directly use selector instead of adding a new key or atom.

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import {selector} from 'recoil'\n\nconst isChild = selector({\n  key: "childage",\n  get: ({ get }) => {\n    const state = get(age);\n    return state < 10 ;\n  }\n});
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2. use the selectors

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Now will use the above-mentioned selector.

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below code snippet use age value to isChild.

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  const [ageState, setAge] = useRecoilState(age);\n\n  const value = useRecoilValue(isChild);
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For a larger view, here is Full Code

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import {selector, useRecoilState} from 'recoil' \n\nconst isChild = selector({\n  key: "childage",\n  get: ({ get }) => {\n    const state = get(age);\n    return state < 10 ;\n  }\n});\n\nexport const AgeCalculator = () => {\n    const [ageState, setAge] = useRecoilState(age);\n   const value = useRecoilValue(isChild);\n}
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That's all, Milord.

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Conclusion

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I hope you got why I am saying this as light.

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Recoil is looking relatively easy, promising, and early-stage, but again this is the next generation, and it will take time to get the own space in the community.

\n","frontmatter":{"date":"April 30, 2021","updated_date":null,"title":"What is recoil.js and how it is managing in react?","tags":["JavaScript","React","Recoil"],"coverImage":{"childImageSharp":{"fluid":{"aspectRatio":1.5037593984962405,"src":"/static/f37a15f3f8cda8461c5455bdd2895e0c/ee604/react.png","srcSet":"/static/f37a15f3f8cda8461c5455bdd2895e0c/69585/react.png 200w,\n/static/f37a15f3f8cda8461c5455bdd2895e0c/497c6/react.png 400w,\n/static/f37a15f3f8cda8461c5455bdd2895e0c/ee604/react.png 800w,\n/static/f37a15f3f8cda8461c5455bdd2895e0c/f3583/react.png 1200w","sizes":"(max-width: 800px) 100vw, 800px"}}},"author":{"id":"Abhimanyu Singh Rathore","github":"abhir9","avatar":null}}}}]}},"pageContext":{"tag":"Recoil"}},"staticQueryHashes":["1171199041","1384082988","2100481360","23180105","528864852"]}