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hook:\"}),`\n`,(0,n.jsx)(e.pre,{\"data-line-numbers\":\"true\",\"data-lang\":\"tsx\",style:{color:\"var(--base05)\",backgroundColor:\"var(--base00)\"},children:(0,n.jsxs)(e.code,{children:[(0,n.jsxs)(e.span,{className:\"codeblock-line\",\"data-line-number\":\"1\",children:[(0,n.jsx)(e.span,{style:{color:\"var(--base0D)\"},children:\"function\"}),\" \",(0,n.jsx)(e.span,{style:{color:\"var(--base0D)\"},children:\"useCount\"}),\"() {\",`\n`]}),(0,n.jsxs)(e.span,{className:\"codeblock-line\",\"data-line-number\":\"2\",children:[\"\t\",(0,n.jsx)(e.span,{style:{color:\"var(--base0A)\"},children:\"const\"}),\" [\",(0,n.jsx)(e.span,{style:{color:\"var(--base08)\"},children:\"count\"}),\", \",(0,n.jsx)(e.span,{style:{color:\"var(--base08)\"},children:\"setCount\"}),\"] \",(0,n.jsx)(e.span,{style:{color:\"var(--base0E)\"},children:\"=\"}),\" 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work.\nThat's because each component is creating its own instance of the state in the\n`,(0,n.jsx)(e.code,{children:\"useCount\"}),` hook, so they're not sharing the same state. In fact, even if you\ncall the hook multiple times in the same component, you'd still get different\ninstances of the state.`]}),`\n`,(0,n.jsx)(e.p,{children:`Often this is what you want. You want the isolation. But sometimes, you want to\nhave that state be shared between the components.`}),`\n`,(0,n.jsxs)(e.p,{children:[`Often you solve this problem by\n`,(0,n.jsx)(e.a,{href:\"https://react.dev/learn/sharing-state-between-components\",children:\"lifting state\"}),`, but\nsometimes that's not very practical because you're many layers away from the\ncomponents that need to share the state or perhaps there's a router involved and\nyou aren't the one rendering the components and don't have an easy way to pass\nprops down.`]}),`\n`,(0,n.jsx)(e.p,{children:`Another situation where you would use this is if you wanted to implicitely share\nstate between components so consumers of those components can use them without\nhaving to know about the state. This is a pattern known as \"Compound Components\"\nand we'll learn more about that in the Compound Components exercise of the\nAdvanced React Patterns workshop.`}),`\n`,(0,n.jsxs)(e.p,{children:[`In these cases, you can use\n`,(0,n.jsx)(e.a,{href:\"https://react.dev/reference/react/createContext\",children:\"context\"}),`. React router\nactually has a built-in feature that allows you to pass state into context and\naccess that value in child routes called\n`,(0,n.jsx)(e.a,{href:\"https://reactrouter.com/en/main/hooks/use-outlet-context\",children:(0,n.jsx)(e.code,{children:\"outletContext\"})}),`\nand in my apps this is what I use most of the time. However, sometimes I do\nstill reach for context.`]}),`\n`,(0,n.jsx)(e.p,{children:\"Here's how you would use context to share state between components:\"}),`\n`,(0,n.jsx)(e.pre,{\"data-line-numbers\":\"true\",\"data-lang\":\"tsx\",style:{color:\"var(--base05)\",backgroundColor:\"var(--base00)\"},children:(0,n.jsxs)(e.code,{children:[(0,n.jsxs)(e.span,{className:\"codeblock-line\",\"data-line-number\":\"1\",children:[(0,n.jsx)(e.span,{style:{color:\"var(--base0E)\"},children:\"import\"}),\" { \",(0,n.jsx)(e.span,{style:{color:\"var(--base08)\"},children:\"createContext\"}),\", \",(0,n.jsx)(e.span,{style:{color:\"var(--base08)\"},children:\"use\"}),\" } \",(0,n.jsx)(e.span,{style:{color:\"var(--base0E)\"},children:\"from\"}),\" 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It's a component that\nhandles the state and provides it to the components that need it. The `,(0,n.jsx)(e.code,{children:\"useCount\"}),`\nhook is a custom hook that uses the `,(0,n.jsx)(e.code,{children:\"use\"}),` hook to access the context. The\n`,(0,n.jsx)(e.code,{children:\"DisplayCount\"}),\" and \",(0,n.jsx)(e.code,{children:\"IncrementCount\"}),\" components are the consumers of the context.\"]}),`\n`,(0,n.jsxs)(e.p,{children:[\"Whenever the \",(0,n.jsx)(e.code,{children:\"value\"}),` prop of the context provider changes, all the components\nthat consume the context value will rerender to get those updates. And they will\nall be referencing the same state.`]}),`\n`,(0,n.jsxs)(e.p,{children:[`Providers can be nested and the closest provider to the consuming component will\nbe the one that provides the value. If there is no provider, the default value\nwill be used. In this case, the default value is `,(0,n.jsx)(e.code,{children:\"null\"}),` and we throw an error if\nthe hook is used without a provider. This is generally a good practice, but\nthere are use cases where you might want to provide a default value. You'll know\nwhen you need to do that, but most of the time you'll want to require a context\nprovider.`]}),`\n`,(0,n.jsx)(\"callout-warning\",{children:(0,n.jsxs)(e.p,{children:[\"If you work in a React app on \",(0,n.jsx)(e.code,{children:\"<= 18.2\"}),\", you'll use \",(0,n.jsx)(e.code,{children:\"useContext\"}),` instead of\nthe more vercitile `,(0,n.jsx)(e.code,{children:\"use\"}),` hook. In the workshop we're using an experimental\nversion of React that has this feature.`]})})]})}function h(a={}){let{wrapper:e}=a.components||{};return e?(0,n.jsx)(e,{...a,children:(0,n.jsx)(d,{...a})}):d(a)}function w(a,e){throw new Error(\"Expected \"+(e?\"component\":\"object\")+\" `\"+a+\"` to be defined: you likely forgot to import, pass, or provide it.\")}return C(D);})();\n;return Component;","finishedCode","var Component=(()=>{var u=Object.create;var s=Object.defineProperty;var x=Object.getOwnPropertyDescriptor;var l=Object.getOwnPropertyNames;var f=Object.getPrototypeOf,m=Object.prototype.hasOwnProperty;var w=(e,t)=>()=>(t||e((t={exports:{}}).exports,t),t.exports),j=(e,t)=>{for(var o in t)s(e,o,{get:t[o],enumerable:!0})},a=(e,t,o,c)=>{if(t&&typeof t==\"object\"||typeof t==\"function\")for(let r of l(t))!m.call(e,r)&&r!==o&&s(e,r,{get:()=>t[r],enumerable:!(c=x(t,r))||c.enumerable});return e};var _=(e,t,o)=>(o=e!=null?u(f(e)):{},a(t||!e||!e.__esModule?s(o,\"default\",{value:e,enumerable:!0}):o,e)),k=e=>a(s({},\"__esModule\",{value:!0}),e);var d=w((E,i)=>{i.exports=_jsx_runtime});var g={};j(g,{default:()=>h,frontmatter:()=>y});var n=_(d()),y=void 0;function p(e){let t={h1:\"h1\",p:\"p\",...e.components},{EpicVideo:o}=t;return o||b(\"EpicVideo\",!0),(0,n.jsxs)(n.Fragment,{children:[(0,n.jsx)(t.h1,{children:\"Shared Context\"}),`\n`,(0,n.jsx)(o,{url:\"https://www.epicreact.dev/workshops/advanced-react-apis/dad-joke-break-shared-context\"}),`\n`,(0,n.jsx)(t.p,{children:`\\u{1F468}\\u200D\\u{1F4BC} Great job! You now know how to properly use context to share state across\nparts of the application. This should serve you well.`})]})}function h(e={}){let{wrapper:t}=e.components||{};return t?(0,n.jsx)(t,{...e,children:(0,n.jsx)(p,{...e})}):p(e)}function b(e,t){throw new Error(\"Expected \"+(t?\"component\":\"object\")+\" `\"+e+\"` to be defined: you likely forgot to import, pass, or provide it.\")}return k(g);})();\n;return Component;","instructionsEpicVideoEmbeds",[577],"https://www.epicreact.dev/workshops/advanced-react-apis/intro-to-shared-context","finishedEpicVideoEmbeds",[580],"https://www.epicreact.dev/workshops/advanced-react-apis/dad-joke-break-shared-context",[582,615],{"_287":286,"_285":583,"_365":603},{"_20":95,"_168":496,"_569":584,"_22":96,"_24":97,"_571":585,"_586":587,"_589":590,"_597":598,"_600":601,"_273":304,"_287":286,"_9":285,"_602":99},"01.problem.provider","var Component=(()=>{var u=Object.create;var a=Object.defineProperty;var w=Object.getOwnPropertyDescriptor;var f=Object.getOwnPropertyNames;var m=Object.getPrototypeOf,x=Object.prototype.hasOwnProperty;var v=(t,e)=>()=>(e||t((e={exports:{}}).exports,e),e.exports),g=(t,e)=>{for(var o in e)a(t,o,{get:e[o],enumerable:!0})},c=(t,e,o,r)=>{if(e&&typeof e==\"object\"||typeof e==\"function\")for(let i of f(e))!x.call(t,i)&&i!==o&&a(t,i,{get:()=>e[i],enumerable:!(r=w(e,i))||r.enumerable});return t};var k=(t,e,o)=>(o=t!=null?u(m(t)):{},c(e||!t||!t.__esModule?a(o,\"default\",{value:t,enumerable:!0}):o,t)),_=t=>c(a({},\"__esModule\",{value:!0}),t);var d=v((b,s)=>{s.exports=_jsx_runtime});var y={};g(y,{default:()=>p,frontmatter:()=>j});var n=k(d()),j=void 0;function h(t){let e={code:\"code\",h1:\"h1\",p:\"p\",...t.components},{EpicVideo:o,PrevDiffLink:r}=e;return o||l(\"EpicVideo\",!0),r||l(\"PrevDiffLink\",!0),(0,n.jsxs)(n.Fragment,{children:[(0,n.jsx)(e.h1,{children:\"Context Provider\"}),`\n`,(0,n.jsx)(o,{url:\"https://www.epicreact.dev/workshops/advanced-react-apis/context-provider\"}),`\n`,(0,n.jsxs)(e.p,{children:[\"\\u{1F9DD}\\u200D\\u2642\\uFE0F I was \",(0,n.jsx)(r,{children:\"refactoring things\"}),` a bit and decided we\nshouldn't need to pass the `,(0,n.jsx)(e.code,{children:\"query\"}),\" and \",(0,n.jsx)(e.code,{children:\"setSearchParams\"}),` as props. Instead I\njust wanted to call `,(0,n.jsx)(e.code,{children:\"useSearchParams\"}),` in each of the components that need them\n(there's only one URL afterall).`]}),`\n`,(0,n.jsxs)(e.p,{children:[`Well that didn't work. Turns out we now have multiple instances of the search\nparams state and multiple subscriptions to the `,(0,n.jsx)(e.code,{children:\"popstate\"}),` event. That's not\nwhat we want at all. It's busted right now. Can you fix this with context?`]}),`\n`,(0,n.jsx)(e.p,{children:\"\\u{1F468}\\u200D\\u{1F4BC} No worries Kellie. We can fix this.\"}),`\n`,(0,n.jsxs)(e.p,{children:[\"So we want to create a context provider that will provide the \",(0,n.jsx)(e.code,{children:\"useSearchParams\"}),`\nhook to the rest of the app.`]}),`\n`,(0,n.jsxs)(e.p,{children:[`We're going to take this in steps though. First we'll create the context\nprovider, render it around the app, and then make a new `,(0,n.jsx)(e.code,{children:\"useSearchParams\"}),` hook\nthat will use the context value.`]}),`\n`,(0,n.jsx)(e.p,{children:\"Good luck! When you're finished, the app should be working again!\"})]})}function p(t={}){let{wrapper:e}=t.components||{};return e?(0,n.jsx)(e,{...t,children:(0,n.jsx)(h,{...t})}):h(t)}function l(t,e){throw new Error(\"Expected \"+(e?\"component\":\"object\")+\" `\"+t+\"` to be defined: you likely forgot to import, pass, or provide it.\")}return _(y);})();\n;return Component;","epicVideoEmbeds",[588],"https://www.epicreact.dev/workshops/advanced-react-apis/context-provider","test",{"_9":591,"_592":593,"_594":595},"browser","pathname","/app/04.01.problem/test/","testFiles",[596],"filtering.test.ts","dev",{"_9":591,"_592":599},"/app/04.01.problem/","stackBlitzUrl","https://stackblitz.com/github/epicweb-dev/advanced-react-apis/tree/main/exercises/04.context/01.problem.provider?view=editor&title=Context+Provider+%28problem%29","solutionName",{"_20":99,"_168":496,"_569":604,"_22":100,"_24":101,"_571":605,"_586":606,"_589":608,"_597":611,"_600":613,"_273":304,"_287":286,"_9":365,"_614":-5},"01.solution.provider","var Component=(()=>{var m=Object.create;var i=Object.defineProperty;var u=Object.getOwnPropertyDescriptor;var f=Object.getOwnPropertyNames;var l=Object.getPrototypeOf,x=Object.prototype.hasOwnProperty;var w=(e,t)=>()=>(t||e((t={exports:{}}).exports,t),t.exports),v=(e,t)=>{for(var o in t)i(e,o,{get:t[o],enumerable:!0})},a=(e,t,o,s)=>{if(t&&typeof t==\"object\"||typeof t==\"function\")for(let r of f(t))!x.call(e,r)&&r!==o&&i(e,r,{get:()=>t[r],enumerable:!(s=u(t,r))||s.enumerable});return e};var _=(e,t,o)=>(o=e!=null?m(l(e)):{},a(t||!e||!e.__esModule?i(o,\"default\",{value:e,enumerable:!0}):o,e)),g=e=>a(i({},\"__esModule\",{value:!0}),e);var d=w((M,c)=>{c.exports=_jsx_runtime});var y={};v(y,{default:()=>h,frontmatter:()=>j});var n=_(d()),j=void 0;function p(e){let t={h1:\"h1\",p:\"p\",...e.components},{EpicVideo:o}=t;return o||k(\"EpicVideo\",!0),(0,n.jsxs)(n.Fragment,{children:[(0,n.jsx)(t.h1,{children:\"Context Provider\"}),`\n`,(0,n.jsx)(o,{url:\"https://www.epicreact.dev/workshops/advanced-react-apis/context-provider/solution\"}),`\n`,(0,n.jsx)(t.p,{children:`\\u{1F468}\\u200D\\u{1F4BC} Great! Now we've got a context provider so all the components can reference\nthe same state for our search params. Next let's improve this more by making\na hook for it and dealing with an issue with the default value.`})]})}function h(e={}){let{wrapper:t}=e.components||{};return t?(0,n.jsx)(t,{...e,children:(0,n.jsx)(p,{...e})}):p(e)}function k(e,t){throw new Error(\"Expected \"+(t?\"component\":\"object\")+\" `\"+e+\"` to be defined: you likely forgot to import, pass, or provide it.\")}return g(y);})();\n;return Component;",[607],"https://www.epicreact.dev/workshops/advanced-react-apis/context-provider/solution",{"_9":591,"_592":609,"_594":610},"/app/04.01.solution/test/",[596],{"_9":591,"_592":612},"/app/04.01.solution/","https://stackblitz.com/github/epicweb-dev/advanced-react-apis/tree/main/exercises/04.context/01.solution.provider?view=editor&title=Context+Provider+%28solution%29","problemName",{"_287":288,"_285":616,"_365":627},{"_20":103,"_168":498,"_569":617,"_22":104,"_24":105,"_571":618,"_586":619,"_589":621,"_597":624,"_600":626,"_273":304,"_287":288,"_9":285,"_602":107},"02.problem.hook","var Component=(()=>{var p=Object.create;var i=Object.defineProperty;var f=Object.getOwnPropertyDescriptor;var w=Object.getOwnPropertyNames;var m=Object.getPrototypeOf,x=Object.prototype.hasOwnProperty;var g=(n,e)=>()=>(e||n((e={exports:{}}).exports,e),e.exports),v=(n,e)=>{for(var o in e)i(n,o,{get:e[o],enumerable:!0})},d=(n,e,o,r)=>{if(e&&typeof e==\"object\"||typeof e==\"function\")for(let a of w(e))!x.call(n,a)&&a!==o&&i(n,a,{get:()=>e[a],enumerable:!(r=f(e,a))||r.enumerable});return n};var y=(n,e,o)=>(o=n!=null?p(m(n)):{},d(e||!n||!n.__esModule?i(o,\"default\",{value:n,enumerable:!0}):o,n)),k=n=>d(i({},\"__esModule\",{value:!0}),n);var h=g((_,c)=>{c.exports=_jsx_runtime});var b={};v(b,{default:()=>u,frontmatter:()=>j});var t=y(h()),j=void 0;function s(n){let e={code:\"code\",h1:\"h1\",p:\"p\",...n.components},{EpicVideo:o,PrevDiffLink:r}=e;return o||l(\"EpicVideo\",!0),r||l(\"PrevDiffLink\",!0),(0,t.jsxs)(t.Fragment,{children:[(0,t.jsx)(e.h1,{children:\"Context Hook\"}),`\n`,(0,t.jsx)(o,{url:\"https://www.epicreact.dev/workshops/advanced-react-apis/context-hook\"}),`\n`,(0,t.jsxs)(e.p,{children:[`\\u{1F9DD}\\u200D\\u2642\\uFE0F I was playing around with the app and I realized that we have a default value\nfor our context provider. So I thought maybe we\ncould `,(0,t.jsx)(r,{children:\"remove the context\"}),` provider. Unfortunately\nthat didn't work. Do you know why?`]}),`\n`,(0,t.jsxs)(e.p,{children:[\"\\u{1F468}\\u200D\\u{1F4BC} Yeah, it's because even though the \",(0,t.jsx)(e.code,{children:\"searchParams\"}),` are shared, they're not\nupdated when calling `,(0,t.jsx)(e.code,{children:\"setSearchParams\"}),\". This is because the \",(0,t.jsx)(e.code,{children:\"searchParams\"}),`\nobject is no longer state. It's just a plain object. So when we call\n`,(0,t.jsx)(e.code,{children:\"setSearchParams\"}),`, nothing rerenders (and even if it did, it wouldn't have\nthe updated `,(0,t.jsx)(e.code,{children:\"searchParams\"}),\").\"]}),`\n`,(0,t.jsxs)(e.p,{children:[`So having a default in our context is pretty meaningless. 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Go ahead and give it a try.\"]}),`\n`,(0,t.jsx)(e.p,{children:\"When you're done, the app should be working again.\"})]})}function u(n={}){let{wrapper:e}=n.components||{};return e?(0,t.jsx)(e,{...n,children:(0,t.jsx)(s,{...n})}):s(n)}function l(n,e){throw new Error(\"Expected \"+(e?\"component\":\"object\")+\" `\"+n+\"` to be defined: you likely forgot to import, pass, or provide it.\")}return k(b);})();\n;return Component;",[620],"https://www.epicreact.dev/workshops/advanced-react-apis/context-hook",{"_9":591,"_592":622,"_594":623},"/app/04.02.problem/test/",[596],{"_9":591,"_592":625},"/app/04.02.problem/","https://stackblitz.com/github/epicweb-dev/advanced-react-apis/tree/main/exercises/04.context/02.problem.hook?view=editor&title=Context+Hook+%28problem%29",{"_20":107,"_168":498,"_569":628,"_22":108,"_24":109,"_571":629,"_586":630,"_589":632,"_597":635,"_600":637,"_273":304,"_287":288,"_9":365,"_614":-5},"02.solution.hook","var Component=(()=>{var h=Object.create;var s=Object.defineProperty;var l=Object.getOwnPropertyDescriptor;var f=Object.getOwnPropertyNames;var x=Object.getPrototypeOf,m=Object.prototype.hasOwnProperty;var w=(t,e)=>()=>(e||t((e={exports:{}}).exports,e),e.exports),_=(t,e)=>{for(var n in e)s(t,n,{get:e[n],enumerable:!0})},c=(t,e,n,i)=>{if(e&&typeof e==\"object\"||typeof e==\"function\")for(let r of f(e))!m.call(t,r)&&r!==n&&s(t,r,{get:()=>e[r],enumerable:!(i=l(e,r))||i.enumerable});return t};var j=(t,e,n)=>(n=t!=null?h(x(t)):{},c(e||!t||!t.__esModule?s(n,\"default\",{value:t,enumerable:!0}):n,t)),y=t=>c(s({},\"__esModule\",{value:!0}),t);var d=w((E,a)=>{a.exports=_jsx_runtime});var v={};_(v,{default:()=>p,frontmatter:()=>g});var o=j(d()),g=void 0;function u(t){let e={h1:\"h1\",p:\"p\",...t.components},{EpicVideo:n}=e;return n||k(\"EpicVideo\",!0),(0,o.jsxs)(o.Fragment,{children:[(0,o.jsx)(e.h1,{children:\"Context Hook\"}),`\n`,(0,o.jsx)(n,{url:\"https://www.epicreact.dev/workshops/advanced-react-apis/context-hook/solution\"}),`\n`,(0,o.jsx)(e.p,{children:\"\\u{1F468}\\u200D\\u{1F4BC} Great job!\"}),`\n`,(0,o.jsx)(e.p,{children:`\\u{1F989} There are definitely cases where a default value for context makes sense, but\noften it does not. You should normally follow the pattern we've done here when\nyou're using context.`})]})}function p(t={}){let{wrapper:e}=t.components||{};return e?(0,o.jsx)(e,{...t,children:(0,o.jsx)(u,{...t})}):u(t)}function k(t,e){throw new Error(\"Expected \"+(e?\"component\":\"object\")+\" `\"+t+\"` to be defined: you likely forgot to import, pass, or provide it.\")}return y(v);})();\n;return Component;",[631],"https://www.epicreact.dev/workshops/advanced-react-apis/context-hook/solution",{"_9":591,"_592":633,"_594":634},"/app/04.02.solution/test/",[596],{"_9":591,"_592":636},"/app/04.02.solution/","https://stackblitz.com/github/epicweb-dev/advanced-react-apis/tree/main/exercises/04.context/02.solution.hook?view=editor&title=Context+Hook+%28solution%29",[639,644],{"_20":95,"_168":496,"_569":584,"_22":96,"_24":97,"_571":585,"_586":640,"_589":641,"_597":643,"_600":601,"_273":304,"_287":286,"_9":285,"_602":99},[588],{"_9":591,"_592":593,"_594":642},[596],{"_9":591,"_592":599},{"_20":103,"_168":498,"_569":617,"_22":104,"_24":105,"_571":618,"_586":645,"_589":646,"_597":648,"_600":626,"_273":304,"_287":288,"_9":285,"_602":107},[620],{"_9":591,"_592":622,"_594":647},[596],{"_9":591,"_592":625},[650,655],{"_20":99,"_168":496,"_569":604,"_22":100,"_24":101,"_571":605,"_586":651,"_589":652,"_597":654,"_600":613,"_273":304,"_287":286,"_9":365,"_614":-5},[607],{"_9":591,"_592":609,"_594":653},[596],{"_9":591,"_592":612},{"_20":107,"_168":498,"_569":628,"_22":108,"_24":109,"_571":629,"_586":656,"_589":657,"_597":659,"_600":637,"_273":304,"_287":288,"_9":365,"_614":-5},[631],{"_9":591,"_592":633,"_594":658},[596],{"_9":591,"_592":636},"exerciseFormEmbedUrl","https://docs.google.com/forms/d/e/1FAIpQLSf3o9xyjQepTlOTH5Z7ZwkeSTdXh6YWI_RGc9KiyD3oUN0p6w/viewform?hl=en&embedded=true&entry.1836176234=Advanced%20React%20APIs%20%F0%9F%94%A5&entry.428900931=Shared%20Context","epicVideoInfosPromise",["P",663],"exerciseFinished",{"_666":667,"_24":668},"file","/myapp/workshop-content/exercises/04.context/FINISHED.mdx","exercises/04.context/FINISHED.mdx","prevStepLink",{"_671":672,"_673":674},"to","/exercise/04/02/solution","aria-label","Context Hook (solution)","nextStepLink",{"_671":677,"_673":506},"/exercise/05","routes/_app+/exercise+/_layout","actionData","errors"]

04. Shared Context/Elaboration