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r=Object.defineProperty;var p=Object.getOwnPropertyDescriptor;var m=Object.getOwnPropertyNames;var u=Object.getPrototypeOf,v=Object.prototype.hasOwnProperty;var y=(a,e)=>()=>(e||a((e={exports:{}}).exports,e),e.exports),k=(a,e)=>{for(var l in e)r(a,l,{get:e[l],enumerable:!0})},o=(a,e,l,c)=>{if(e&&typeof e==\"object\"||typeof e==\"function\")for(let s of m(e))!v.call(a,s)&&s!==l&&r(a,s,{get:()=>e[s],enumerable:!(c=p(e,s))||c.enumerable});return a};var N=(a,e,l)=>(l=a!=null?h(u(a)):{},o(e||!a||!a.__esModule?r(l,\"default\",{value:a,enumerable:!0}):l,a)),C=a=>o(r({},\"__esModule\",{value:!0}),a);var i=y((E,t)=>{t.exports=_jsx_runtime});var g={};k(g,{default:()=>b,frontmatter:()=>D});var n=N(i()),D=void 0;function d(a){let e={a:\"a\",code:\"code\",h1:\"h1\",h2:\"h2\",p:\"p\",pre:\"pre\",span:\"span\",...a.components},{EpicVideo:l}=e;return l||f(\"EpicVideo\",!0),(0,n.jsxs)(n.Fragment,{children:[(0,n.jsx)(e.h1,{children:\"Lifting State\"}),`\n`,(0,n.jsx)(l,{url:\"https://www.epicreact.dev/workshops/react-hooks/intro-to-lifting-state\"}),`\n`,(0,n.jsxs)(e.p,{children:[`A common question from React beginners is how to share state between two sibling\ncomponents. The answer is to\n`,(0,n.jsx)(e.a,{href:\"https://react.dev/learn/sharing-state-between-components\",children:'\"lift the state\"'}),`\nwhich basically amounts to finding the lowest common parent shared between the\ntwo components and placing the state management there, and then passing the\nstate and a mechanism for updating that state down into the components that need\nit.`]}),`\n`,(0,n.jsx)(e.p,{children:\"Let's look at a simple example.\"}),`\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:\"useState\"}),\" } \",(0,n.jsx)(e.span,{style:{color:\"var(--base0E)\"},children:\"from\"}),\" \",\"'\",(0,n.jsx)(e.span,{style:{color:\"var(--base0B)\"},children:\"react\"}),\"'\",`\n`]}),(0,n.jsx)(e.span,{className:\"codeblock-line\",\"data-line-number\":\"2\",children:`\n`}),(0,n.jsxs)(e.span,{className:\"codeblock-line\",\"data-line-number\":\"3\",children:[(0,n.jsx)(e.span,{style:{color:\"var(--base0D)\"},children:\"function\"}),\" \",(0,n.jsx)(e.span,{style:{color:\"var(--base0D)\"},children:\"App\"}),\"() {\",`\n`]}),(0,n.jsxs)(e.span,{className:\"codeblock-line\",\"data-line-number\":\"4\",children:[\"\t\",(0,n.jsx)(e.span,{style:{color:\"var(--base0E)\"},children:\"return\"}),\" (\",`\n`]}),(0,n.jsxs)(e.span,{className:\"codeblock-line\",\"data-line-number\":\"5\",children:[\"\t\t<\",(0,n.jsx)(e.span,{style:{color:\"var(--base08)\"},children:\"div\"}),\">\",`\n`]}),(0,n.jsxs)(e.span,{className:\"codeblock-line\",\"data-line-number\":\"6\",children:[\"\t\t\t<\",(0,n.jsx)(e.span,{style:{color:\"var(--base0A)\"},children:\"Counter\"}),\" />\",`\n`]}),(0,n.jsxs)(e.span,{className:\"codeblock-line\",\"data-line-number\":\"7\",children:[\"\t\t\",`\n`]}),(0,n.jsxs)(e.span,{className:\"codeblock-line\",\"data-line-number\":\"8\",children:[\"\t)\",`\n`]}),(0,n.jsxs)(e.span,{className:\"codeblock-line\",\"data-line-number\":\"9\",children:[\"}\",`\n`]}),(0,n.jsx)(e.span,{className:\"codeblock-line\",\"data-line-number\":\"10\",children:`\n`}),(0,n.jsxs)(e.span,{className:\"codeblock-line\",\"data-line-number\":\"11\",children:[(0,n.jsx)(e.span,{style:{color:\"var(--base0D)\"},children:\"function\"}),\" \",(0,n.jsx)(e.span,{style:{color:\"var(--base0D)\"},children:\"Counter\"}),\"() {\",`\n`]}),(0,n.jsxs)(e.span,{className:\"codeblock-line\",\"data-line-number\":\"12\",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:\"=\"}),\" \",(0,n.jsx)(e.span,{style:{color:\"var(--base0D)\"},children:\"useState\"}),\"(\",(0,n.jsx)(e.span,{style:{color:\"var(--base09)\"},children:\"0\"}),\")\",`\n`]}),(0,n.jsx)(e.span,{className:\"codeblock-line\",\"data-line-number\":\"13\",children:`\n`}),(0,n.jsxs)(e.span,{className:\"codeblock-line\",\"data-line-number\":\"14\",children:[\"\t\",(0,n.jsx)(e.span,{style:{color:\"var(--base0E)\"},children:\"return\"}),\" (\",`\n`]}),(0,n.jsxs)(e.span,{className:\"codeblock-line\",\"data-line-number\":\"15\",children:[\"\t\t<\",(0,n.jsx)(e.span,{style:{color:\"var(--base08)\"},children:\"div\"}),\">\",`\n`]}),(0,n.jsxs)(e.span,{className:\"codeblock-line\",\"data-line-number\":\"16\",children:[\"\t\t\t<\",(0,n.jsx)(e.span,{style:{color:\"var(--base08)\"},children:\"button\"}),\" \",(0,n.jsx)(e.span,{style:{color:\"var(--base0D)\"},children:\"onClick\"}),(0,n.jsx)(e.span,{style:{color:\"var(--base0E)\"},children:\"=\"}),(0,n.jsx)(e.span,{style:{color:\"var(--base0F)\"},children:\"{\"}),\"() \",(0,n.jsx)(e.span,{style:{color:\"var(--base0D)\"},children:\"=>\"}),\" \",(0,n.jsx)(e.span,{style:{color:\"var(--base0D)\"},children:\"setCount\"}),\"(\",(0,n.jsx)(e.span,{style:{color:\"var(--base08)\"},children:\"count\"}),\" \",(0,n.jsx)(e.span,{style:{color:\"var(--base0E)\"},children:\"+\"}),\" \",(0,n.jsx)(e.span,{style:{color:\"var(--base09)\"},children:\"1\"}),\")\",(0,n.jsx)(e.span,{style:{color:\"var(--base0F)\"},children:\"}\"}),\">Increment\",`\n`]}),(0,n.jsxs)(e.span,{className:\"codeblock-line\",\"data-line-number\":\"17\",children:[\"\t\t\",`\n`]}),(0,n.jsxs)(e.span,{className:\"codeblock-line\",\"data-line-number\":\"18\",children:[\"\t)\",`\n`]}),(0,n.jsxs)(e.span,{className:\"codeblock-line\",\"data-line-number\":\"19\",children:[\"}\",`\n`]})]})}),`\n`,(0,n.jsxs)(e.p,{children:[\"In this example, the \",(0,n.jsx)(e.code,{children:\"Counter\"}),` component has its own state. What if I wanted to\nmake a fancy `,(0,n.jsx)(e.code,{children:\"CountDisplay\"}),\" component that was a sibling to the Counter:\"]}),`\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:\"App\"}),\"() {\",`\n`]}),(0,n.jsxs)(e.span,{className:\"codeblock-line\",\"data-line-number\":\"2\",children:[\"\t\",(0,n.jsx)(e.span,{style:{color:\"var(--base0E)\"},children:\"return\"}),\" 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0\",`\n`]}),(0,n.jsxs)(e.span,{className:\"codeblock-line\",\"data-line-number\":\"12\",children:[\"}\",`\n`]})]})}),`\n`,(0,n.jsxs)(e.p,{children:[\"How can I get the \",(0,n.jsx)(e.code,{children:\"CountDisplay\"}),\" to show the current count from the \",(0,n.jsx)(e.code,{children:\"Counter\"}),`?\nThe answer is to lift the state up to the `,(0,n.jsx)(e.code,{children:\"App\"}),` component and then pass the\nstate and a mechanism for updating that state down into the `,(0,n.jsx)(e.code,{children:\"Counter\"}),` and\n`,(0,n.jsx)(e.code,{children:\"CountDisplay\"}),\" 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(--base0D)\"},children:\"function\"}),\" 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(\",`\n`]}),(0,n.jsxs)(e.span,{className:\"codeblock-line\",\"data-line-number\":\"14\",children:[\"\t\t<\",(0,n.jsx)(e.span,{style:{color:\"var(--base08)\"},children:\"div\"}),\">\",`\n`]}),(0,n.jsxs)(e.span,{className:\"codeblock-line\",\"data-line-number\":\"15\",children:[\"\t\t\t<\",(0,n.jsx)(e.span,{style:{color:\"var(--base08)\"},children:\"button\"}),\" \",(0,n.jsx)(e.span,{style:{color:\"var(--base0D)\"},children:\"onClick\"}),(0,n.jsx)(e.span,{style:{color:\"var(--base0E)\"},children:\"=\"}),(0,n.jsx)(e.span,{style:{color:\"var(--base0F)\"},children:\"{\"}),\"() \",(0,n.jsx)(e.span,{style:{color:\"var(--base0D)\"},children:\"=>\"}),\" \",(0,n.jsx)(e.span,{style:{color:\"var(--base0D)\"},children:\"setCount\"}),\"(\",(0,n.jsx)(e.span,{style:{color:\"var(--base08)\"},children:\"count\"}),\" \",(0,n.jsx)(e.span,{style:{color:\"var(--base0E)\"},children:\"+\"}),\" \",(0,n.jsx)(e.span,{style:{color:\"var(--base09)\"},children:\"1\"}),\")\",(0,n.jsx)(e.span,{style:{color:\"var(--base0F)\"},children:\"}\"}),\">Increment\",`\n`]}),(0,n.jsxs)(e.span,{className:\"codeblock-line\",\"data-line-number\":\"16\",children:[\"\t\t\",`\n`]}),(0,n.jsxs)(e.span,{className:\"codeblock-line\",\"data-line-number\":\"17\",children:[\"\t)\",`\n`]}),(0,n.jsxs)(e.span,{className:\"codeblock-line\",\"data-line-number\":\"18\",children:[\"}\",`\n`]}),(0,n.jsx)(e.span,{className:\"codeblock-line\",\"data-line-number\":\"19\",children:`\n`}),(0,n.jsxs)(e.span,{className:\"codeblock-line\",\"data-line-number\":\"20\",children:[(0,n.jsx)(e.span,{style:{color:\"var(--base0D)\"},children:\"function\"}),\" \",(0,n.jsx)(e.span,{style:{color:\"var(--base0D)\"},children:\"CountDisplay\"}),\"({ \",(0,n.jsx)(e.span,{style:{color:\"var(--base08)\"},children:\"count\"}),\" }) {\",`\n`]}),(0,n.jsxs)(e.span,{className:\"codeblock-line\",\"data-line-number\":\"21\",children:[\"\t\",(0,n.jsx)(e.span,{style:{color:\"var(--base0E)\"},children:\"return\"}),\" <\",(0,n.jsx)(e.span,{style:{color:\"var(--base08)\"},children:\"div\"}),\">Count: \",(0,n.jsx)(e.span,{style:{color:\"var(--base0F)\"},children:\"{\"}),(0,n.jsx)(e.span,{style:{color:\"var(--base08)\"},children:\"count\"}),(0,n.jsx)(e.span,{style:{color:\"var(--base0F)\"},children:\"}\"}),\"\",`\n`]}),(0,n.jsxs)(e.span,{className:\"codeblock-line\",\"data-line-number\":\"22\",children:[\"}\",`\n`]})]})}),`\n`,(0,n.jsxs)(e.p,{children:[\"Now the \",(0,n.jsx)(e.code,{children:\"App\"}),` component is managing the state and passing it down to the\n`,(0,n.jsx)(e.code,{children:\"Counter\"}),\" and \",(0,n.jsx)(e.code,{children:\"CountDisplay\"}),` components. This is a simple example, but the\nprinciple is the same for more complex state management.`]}),`\n`,(0,n.jsx)(e.p,{children:`There are other ways to get the state around to components that need it. We'll\ncover my preferred pattern of using composition in the Advanced React Patterns\nworkshop, but moving state up the tree is pretty common.`}),`\n`,(0,n.jsx)(e.h2,{children:\"Colocating state\"}),`\n`,(0,n.jsx)(e.p,{children:`One thing that's not as common as it should be in React is moving state the\nother direction when changes are made. This is because you don't have to do it\nfor things to work, but it's better for performance and maintainability if you\ndo.`}),`\n`,(0,n.jsxs)(e.p,{children:[`Let's take our example further by saying that we no longer need the\n`,(0,n.jsx)(e.code,{children:\"CountDisplay\"}),` component to show the count. Instead, we want to show the count\nin the button of the Counter. So we might do this:`]}),`\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:\"App\"}),\"() {\",`\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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(\",`\n`]}),(0,n.jsxs)(e.span,{className:\"codeblock-line\",\"data-line-number\":\"13\",children:[\"\t\t<\",(0,n.jsx)(e.span,{style:{color:\"var(--base08)\"},children:\"div\"}),\">\",`\n`]}),(0,n.jsxs)(e.span,{className:\"codeblock-line\",\"data-line-number\":\"14\",children:[\"\t\t\t<\",(0,n.jsx)(e.span,{style:{color:\"var(--base08)\"},children:\"button\"}),\" \",(0,n.jsx)(e.span,{style:{color:\"var(--base0D)\"},children:\"onClick\"}),(0,n.jsx)(e.span,{style:{color:\"var(--base0E)\"},children:\"=\"}),(0,n.jsx)(e.span,{style:{color:\"var(--base0F)\"},children:\"{\"}),\"() \",(0,n.jsx)(e.span,{style:{color:\"var(--base0D)\"},children:\"=>\"}),\" \",(0,n.jsx)(e.span,{style:{color:\"var(--base0D)\"},children:\"setCount\"}),\"(\",(0,n.jsx)(e.span,{style:{color:\"var(--base08)\"},children:\"count\"}),\" \",(0,n.jsx)(e.span,{style:{color:\"var(--base0E)\"},children:\"+\"}),\" \",(0,n.jsx)(e.span,{style:{color:\"var(--base09)\"},children:\"1\"}),\")\",(0,n.jsx)(e.span,{style:{color:\"var(--base0F)\"},children:\"}\"}),\">Increment (\",(0,n.jsx)(e.span,{style:{color:\"var(--base0F)\"},children:\"{\"}),(0,n.jsx)(e.span,{style:{color:\"var(--base08)\"},children:\"count\"}),(0,n.jsx)(e.span,{style:{color:\"var(--base0F)\"},children:\"}\"}),\")\",`\n`]}),(0,n.jsxs)(e.span,{className:\"codeblock-line\",\"data-line-number\":\"15\",children:[\"\t\t\",`\n`]}),(0,n.jsxs)(e.span,{className:\"codeblock-line\",\"data-line-number\":\"16\",children:[\"\t)\",`\n`]}),(0,n.jsxs)(e.span,{className:\"codeblock-line\",\"data-line-number\":\"17\",children:[\"}\",`\n`]})]})}),`\n`,(0,n.jsxs)(e.p,{children:[\"But now the \",(0,n.jsx)(e.code,{children:\"App\"}),` component is managing the state and passing it down to the\n`,(0,n.jsx)(e.code,{children:\"Counter\"}),\" component, but nothing but the \",(0,n.jsx)(e.code,{children:\"Counter\"}),` needs this state. So we can\nmove the state back down to the `,(0,n.jsx)(e.code,{children:\"Counter\"}),\" component:\"]}),`\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:\"App\"}),\"() {\",`\n`]}),(0,n.jsxs)(e.span,{className:\"codeblock-line\",\"data-line-number\":\"2\",children:[\"\t\",(0,n.jsx)(e.span,{style:{color:\"var(--base0E)\"},children:\"return\"}),\" (\",`\n`]}),(0,n.jsxs)(e.span,{className:\"codeblock-line\",\"data-line-number\":\"3\",children:[\"\t\t<\",(0,n.jsx)(e.span,{style:{color:\"var(--base08)\"},children:\"div\"}),\">\",`\n`]}),(0,n.jsxs)(e.span,{className:\"codeblock-line\",\"data-line-number\":\"4\",children:[\"\t\t\t<\",(0,n.jsx)(e.span,{style:{color:\"var(--base0A)\"},children:\"Counter\"}),\" />\",`\n`]}),(0,n.jsxs)(e.span,{className:\"codeblock-line\",\"data-line-number\":\"5\",children:[\"\t\t\",`\n`]}),(0,n.jsxs)(e.span,{className:\"codeblock-line\",\"data-line-number\":\"6\",children:[\"\t)\",`\n`]}),(0,n.jsxs)(e.span,{className:\"codeblock-line\",\"data-line-number\":\"7\",children:[\"}\",`\n`]}),(0,n.jsx)(e.span,{className:\"codeblock-line\",\"data-line-number\":\"8\",children:`\n`}),(0,n.jsxs)(e.span,{className:\"codeblock-line\",\"data-line-number\":\"9\",children:[(0,n.jsx)(e.span,{style:{color:\"var(--base0D)\"},children:\"function\"}),\" \",(0,n.jsx)(e.span,{style:{color:\"var(--base0D)\"},children:\"Counter\"}),\"() {\",`\n`]}),(0,n.jsxs)(e.span,{className:\"codeblock-line\",\"data-line-number\":\"10\",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:\"=\"}),\" \",(0,n.jsx)(e.span,{style:{color:\"var(--base0D)\"},children:\"useState\"}),\"(\",(0,n.jsx)(e.span,{style:{color:\"var(--base09)\"},children:\"0\"}),\")\",`\n`]}),(0,n.jsx)(e.span,{className:\"codeblock-line\",\"data-line-number\":\"11\",children:`\n`}),(0,n.jsxs)(e.span,{className:\"codeblock-line\",\"data-line-number\":\"12\",children:[\"\t\",(0,n.jsx)(e.span,{style:{color:\"var(--base0E)\"},children:\"return\"}),\" (\",`\n`]}),(0,n.jsxs)(e.span,{className:\"codeblock-line\",\"data-line-number\":\"13\",children:[\"\t\t<\",(0,n.jsx)(e.span,{style:{color:\"var(--base08)\"},children:\"div\"}),\">\",`\n`]}),(0,n.jsxs)(e.span,{className:\"codeblock-line\",\"data-line-number\":\"14\",children:[\"\t\t\t<\",(0,n.jsx)(e.span,{style:{color:\"var(--base08)\"},children:\"button\"}),\" \",(0,n.jsx)(e.span,{style:{color:\"var(--base0D)\"},children:\"onClick\"}),(0,n.jsx)(e.span,{style:{color:\"var(--base0E)\"},children:\"=\"}),(0,n.jsx)(e.span,{style:{color:\"var(--base0F)\"},children:\"{\"}),\"() \",(0,n.jsx)(e.span,{style:{color:\"var(--base0D)\"},children:\"=>\"}),\" \",(0,n.jsx)(e.span,{style:{color:\"var(--base0D)\"},children:\"setCount\"}),\"(\",(0,n.jsx)(e.span,{style:{color:\"var(--base08)\"},children:\"count\"}),\" \",(0,n.jsx)(e.span,{style:{color:\"var(--base0E)\"},children:\"+\"}),\" \",(0,n.jsx)(e.span,{style:{color:\"var(--base09)\"},children:\"1\"}),\")\",(0,n.jsx)(e.span,{style:{color:\"var(--base0F)\"},children:\"}\"}),\">Increment (\",(0,n.jsx)(e.span,{style:{color:\"var(--base0F)\"},children:\"{\"}),(0,n.jsx)(e.span,{style:{color:\"var(--base08)\"},children:\"count\"}),(0,n.jsx)(e.span,{style:{color:\"var(--base0F)\"},children:\"}\"}),\")\",`\n`]}),(0,n.jsxs)(e.span,{className:\"codeblock-line\",\"data-line-number\":\"15\",children:[\"\t\t\",`\n`]}),(0,n.jsxs)(e.span,{className:\"codeblock-line\",\"data-line-number\":\"16\",children:[\"\t)\",`\n`]}),(0,n.jsxs)(e.span,{className:\"codeblock-line\",\"data-line-number\":\"17\",children:[\"}\",`\n`]})]})}),`\n`,(0,n.jsx)(e.p,{children:`Novice React developers learn to lift state pretty early, but experienced React\ndevelopers know how to recognize when state can be \"pushed down.\"`}),`\n`,(0,n.jsx)(e.p,{children:\"Let's do both in this exercise.\"}),`\n`,(0,n.jsxs)(e.p,{children:[`Read more about state colocation from\n`,(0,n.jsx)(e.a,{href:\"https://kentcdodds.com/blog/state-colocation-will-make-your-react-app-faster\",children:\"State Colocation will make your React app faster\"}),\".\"]})]})}function b(a={}){let{wrapper:e}=a.components||{};return e?(0,n.jsx)(e,{...a,children:(0,n.jsx)(d,{...a})}):d(a)}function f(a,e){throw new Error(\"Expected \"+(e?\"component\":\"object\")+\" `\"+a+\"` to be defined: you likely forgot to import, pass, or provide it.\")}return C(g);})();\n;return Component;","finishedCode","var Component=(()=>{var f=Object.create;var i=Object.defineProperty;var m=Object.getOwnPropertyDescriptor;var h=Object.getOwnPropertyNames;var l=Object.getPrototypeOf,x=Object.prototype.hasOwnProperty;var w=(e,t)=>()=>(t||e((t={exports:{}}).exports,t),t.exports),_=(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 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You've learned how to move state around as needed like a pro!\"})]})}function u(e={}){let{wrapper:t}=e.components||{};return t?(0,n.jsx)(t,{...e,children:(0,n.jsx)(p,{...e})}):p(e)}function v(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;","instructionsEpicVideoEmbeds",[572],"https://www.epicreact.dev/workshops/react-hooks/intro-to-lifting-state","finishedEpicVideoEmbeds",[575],"https://www.epicreact.dev/workshops/react-hooks/dad-joke-break-lifting-state",[577,615,638],{"_293":294,"_290":578,"_320":603},{"_20":79,"_166":476,"_564":579,"_22":80,"_24":81,"_566":580,"_581":582,"_584":585,"_597":598,"_600":601,"_291":321,"_293":294,"_9":290,"_602":83},"01.problem.lift","var Component=(()=>{var u=Object.create;var s=Object.defineProperty;var f=Object.getOwnPropertyDescriptor;var m=Object.getOwnPropertyNames;var w=Object.getPrototypeOf,k=Object.prototype.hasOwnProperty;var y=(t,e)=>()=>(e||t((e={exports:{}}).exports,e),e.exports),g=(t,e)=>{for(var o in e)s(t,o,{get:e[o],enumerable:!0})},a=(t,e,o,r)=>{if(e&&typeof e==\"object\"||typeof e==\"function\")for(let i of m(e))!k.call(t,i)&&i!==o&&s(t,i,{get:()=>e[i],enumerable:!(r=f(e,i))||r.enumerable});return t};var b=(t,e,o)=>(o=t!=null?u(w(t)):{},a(e||!t||!t.__esModule?s(o,\"default\",{value:t,enumerable:!0}):o,t)),x=t=>a(s({},\"__esModule\",{value:!0}),t);var p=y((I,c)=>{c.exports=_jsx_runtime});var _={};g(_,{default:()=>l,frontmatter:()=>j});var n=b(p()),j=void 0;function h(t){let e={a:\"a\",code:\"code\",h1:\"h1\",p:\"p\",...t.components},{DiffLink:o,EpicVideo:r}=e;return o||d(\"DiffLink\",!0),r||d(\"EpicVideo\",!0),(0,n.jsxs)(n.Fragment,{children:[(0,n.jsx)(e.h1,{children:\"Lift State\"}),`\n`,(0,n.jsx)(r,{url:\"https://www.epicreact.dev/workshops/react-hooks/lift-state\"}),`\n`,(0,n.jsxs)(e.p,{children:[`\\u{1F9DD}\\u200D\\u2642\\uFE0F I refactored the app a bit. In the process I kinda broke stuff and you'll be\nrequired to fix it. Feel free to `,(0,n.jsx)(o,{app1:-1,app2:0,children:\"check the diff\"}),`\nto know what I've done. I pretty much just moved stuff into separate components\nto get a little more organization in here.`]}),`\n`,(0,n.jsx)(\"callout-info\",{children:(0,n.jsxs)(e.p,{children:[\"\\u{1F989} Check out \",(0,n.jsx)(e.a,{href:\"https://kentcdodds.com/blog/when-to-break-up-a-component-into-multiple-components\",children:`When to break up a component into multiple\ncomponents`}),\".\"]})}),`\n`,(0,n.jsx)(e.p,{children:`\\u{1F9DD}\\u200D\\u2642\\uFE0F Oh, also I added a new feature. You can now \"like\" specific posts by clicking\na little heart on the post. How nice! It's not persisted anywhere yet, so when\nyou refresh the page the likes all get reset, but it's a nice start!`}),`\n`,(0,n.jsxs)(e.p,{children:[`\\u{1F468}\\u200D\\u{1F4BC} Great, now your job is to fix what's broken. You need to move not only the\nstate, but also we're going to have you move the `,(0,n.jsx)(e.code,{children:\"useEffect\"}),` that sets the query\nas well.`]}),`\n`,(0,n.jsx)(e.p,{children:\"Then you're going to need to pass props to the components as needed. Enjoy!\"})]})}function l(t={}){let{wrapper:e}=t.components||{};return e?(0,n.jsx)(e,{...t,children:(0,n.jsx)(h,{...t})}):h(t)}function d(t,e){throw new Error(\"Expected \"+(e?\"component\":\"object\")+\" `\"+t+\"` to be defined: you likely forgot to import, pass, or provide it.\")}return x(_);})();\n;return Component;","epicVideoEmbeds",[583],"https://www.epicreact.dev/workshops/react-hooks/lift-state","test",{"_9":586,"_587":588,"_589":590},"browser","pathname","/app/03.01.problem/test/","testFiles",[591,592,593,594,595,596],"controlled-checkbox.test.ts","controlled-search.test.ts","filtering.test.ts","like-post.test.ts","popstate.test.ts","search-params.test.ts","dev",{"_9":586,"_587":599},"/app/03.01.problem/","stackBlitzUrl","https://stackblitz.com/github/epicweb-dev/react-hooks/tree/main/exercises/03.lifting-state/01.problem.lift?view=editor&title=Lift+State+%28problem%29&hidedevtools=1&terminalHeight=0&hideNavigation=1&file=index.tsx","solutionName",{"_20":83,"_166":476,"_564":604,"_22":84,"_24":85,"_566":605,"_581":606,"_584":608,"_597":611,"_600":613,"_291":321,"_293":294,"_9":320,"_614":-5},"01.solution.lift","var Component=(()=>{var h=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),_=(e,t)=>{for(var n in t)i(e,n,{get:t[n],enumerable:!0})},c=(e,t,n,s)=>{if(t&&typeof t==\"object\"||typeof t==\"function\")for(let r of f(t))!x.call(e,r)&&r!==n&&i(e,r,{get:()=>t[r],enumerable:!(s=u(t,r))||s.enumerable});return e};var g=(e,t,n)=>(n=e!=null?h(l(e)):{},c(t||!e||!e.__esModule?i(n,\"default\",{value:e,enumerable:!0}):n,e)),j=e=>c(i({},\"__esModule\",{value:!0}),e);var d=w((I,a)=>{a.exports=_jsx_runtime});var M={};_(M,{default:()=>p,frontmatter:()=>k});var o=g(d()),k=void 0;function m(e){let t={h1:\"h1\",p:\"p\",...e.components},{EpicVideo:n}=t;return n||E(\"EpicVideo\",!0),(0,o.jsxs)(o.Fragment,{children:[(0,o.jsx)(t.h1,{children:\"Lift State\"}),`\n`,(0,o.jsx)(n,{url:\"https://www.epicreact.dev/workshops/react-hooks/lift-state/solution\"}),`\n`,(0,o.jsx)(t.p,{children:\"\\u{1F468}\\u200D\\u{1F4BC} Great! It's working now!\"}),`\n`,(0,o.jsx)(t.p,{children:\"Hmmm... What's that I hear? It's the sound of a new requirement coming in! \\u{1F606}\"})]})}function p(e={}){let{wrapper:t}=e.components||{};return t?(0,o.jsx)(t,{...e,children:(0,o.jsx)(m,{...e})}):m(e)}function E(e,t){throw new Error(\"Expected \"+(t?\"component\":\"object\")+\" `\"+e+\"` to be defined: you likely forgot to import, pass, or provide it.\")}return j(M);})();\n;return Component;",[607],"https://www.epicreact.dev/workshops/react-hooks/lift-state/solution",{"_9":586,"_587":609,"_589":610},"/app/03.01.solution/test/",[591,592,593,594,595,596],{"_9":586,"_587":612},"/app/03.01.solution/","https://stackblitz.com/github/epicweb-dev/react-hooks/tree/main/exercises/03.lifting-state/01.solution.lift?view=editor&title=Lift+State+%28solution%29&hidedevtools=1&terminalHeight=0&hideNavigation=1&file=index.tsx","problemName",{"_293":292,"_290":616,"_320":627},{"_20":87,"_166":478,"_564":617,"_22":88,"_24":89,"_566":618,"_581":619,"_584":621,"_597":624,"_600":626,"_291":321,"_293":292,"_9":290,"_602":91},"02.problem.lift-array","var Component=(()=>{var u=Object.create;var i=Object.defineProperty;var f=Object.getOwnPropertyDescriptor;var p=Object.getOwnPropertyNames;var m=Object.getPrototypeOf,w=Object.prototype.hasOwnProperty;var y=(t,e)=>()=>(e||t((e={exports:{}}).exports,e),e.exports),g=(t,e)=>{for(var n in e)i(t,n,{get:e[n],enumerable:!0})},d=(t,e,n,s)=>{if(e&&typeof e==\"object\"||typeof e==\"function\")for(let r of p(e))!w.call(t,r)&&r!==n&&i(t,r,{get:()=>e[r],enumerable:!(s=f(e,r))||s.enumerable});return t};var x=(t,e,n)=>(n=t!=null?u(m(t)):{},d(e||!t||!t.__esModule?i(n,\"default\",{value:t,enumerable:!0}):n,t)),v=t=>d(i({},\"__esModule\",{value:!0}),t);var h=y((k,c)=>{c.exports=_jsx_runtime});var M={};g(M,{default:()=>l,frontmatter:()=>_});var o=x(h()),_=void 0;function a(t){let e={code:\"code\",h1:\"h1\",p:\"p\",...t.components},{EpicVideo:n}=e;return n||j(\"EpicVideo\",!0),(0,o.jsxs)(o.Fragment,{children:[(0,o.jsx)(e.h1,{children:\"Lift More State\"}),`\n`,(0,o.jsx)(n,{url:\"https://www.epicreact.dev/workshops/react-hooks/lift-more-state\"}),`\n`,(0,o.jsx)(e.p,{children:`\\u{1F468}\\u200D\\u{1F4BC} The users loved \\u{1F9DD}\\u200D\\u2642\\uFE0F Kellie's like feature so much they want to have the blog\nposts sorted by whether they're favorites.`}),`\n`,(0,o.jsx)(e.p,{children:`\\u{1F9DD}\\u200D\\u2642\\uFE0F I've already created the sort function. 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Good luck!`]})]})}function l(t={}){let{wrapper:e}=t.components||{};return e?(0,o.jsx)(e,{...t,children:(0,o.jsx)(a,{...t})}):a(t)}function j(t,e){throw new Error(\"Expected \"+(e?\"component\":\"object\")+\" `\"+t+\"` to be defined: you likely forgot to import, pass, or provide it.\")}return v(M);})();\n;return Component;",[620],"https://www.epicreact.dev/workshops/react-hooks/lift-more-state",{"_9":586,"_587":622,"_589":623},"/app/03.02.problem/test/",[591,592,593,594,595,596],{"_9":586,"_587":625},"/app/03.02.problem/","https://stackblitz.com/github/epicweb-dev/react-hooks/tree/main/exercises/03.lifting-state/02.problem.lift-array?view=editor&title=Lift+More+State+%28problem%29&hidedevtools=1&terminalHeight=0&hideNavigation=1&file=index.tsx",{"_20":91,"_166":478,"_564":628,"_22":92,"_24":93,"_566":629,"_581":630,"_584":632,"_597":635,"_600":637,"_291":321,"_293":292,"_9":320,"_614":-5},"02.solution.lift-array","var Component=(()=>{var f=Object.create;var s=Object.defineProperty;var m=Object.getOwnPropertyDescriptor;var h=Object.getOwnPropertyNames;var l=Object.getPrototypeOf,x=Object.prototype.hasOwnProperty;var w=(t,e)=>()=>(e||t((e={exports:{}}).exports,e),e.exports),_=(t,e)=>{for(var o in e)s(t,o,{get:e[o],enumerable:!0})},c=(t,e,o,i)=>{if(e&&typeof e==\"object\"||typeof e==\"function\")for(let r of h(e))!x.call(t,r)&&r!==o&&s(t,r,{get:()=>e[r],enumerable:!(i=m(e,r))||i.enumerable});return t};var j=(t,e,o)=>(o=t!=null?f(l(t)):{},c(e||!t||!t.__esModule?s(o,\"default\",{value:t,enumerable:!0}):o,t)),b=t=>c(s({},\"__esModule\",{value:!0}),t);var d=w((E,a)=>{a.exports=_jsx_runtime});var k={};_(k,{default:()=>u,frontmatter:()=>M});var n=j(d()),M=void 0;function p(t){let e={h1:\"h1\",p:\"p\",...t.components},{EpicVideo:o}=e;return o||g(\"EpicVideo\",!0),(0,n.jsxs)(n.Fragment,{children:[(0,n.jsx)(e.h1,{children:\"Lift More State\"}),`\n`,(0,n.jsx)(o,{url:\"https://www.epicreact.dev/workshops/react-hooks/lift-more-state/solution\"}),`\n`,(0,n.jsx)(e.p,{children:\"\\u{1F468}\\u200D\\u{1F4BC} Great job! 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You now know how to colocate state! Try to do this as much as\npossible in the future.`}),`\n`,(0,o.jsxs)(e.p,{children:[\"\\u{1F989} You may have noticed that by putting the state in the \",(0,o.jsx)(e.code,{children:\"Card\"}),`, you actually\nlose the favorited state of the card whenever the card is removed from the page\n(like if you do a search that filters out the card). So really the best place\nfor this state would be in the `,(0,o.jsx)(e.code,{children:\"App\"}),` to ensure it never gets lost (except on\npage reloads). Really the best place for this type of state would be in the\ndatabase but that's out of scope for this workshop.`]}),`\n`,(0,o.jsxs)(e.p,{children:[`In this exercise, I mostly want you to appreciate how much it simplifies our\n`,(0,o.jsx)(e.code,{children:\"Card\"}),\" component and the \",(0,o.jsx)(e.code,{children:\"MatchingPosts\"}),` component by moving the state into the\n`,(0,o.jsx)(e.code,{children:\"Card\"}),` itself. Additionally, it helps performance because now when the favorite\nstate changes for a card, React only needs to re-render that card rather than\nthe entire `,(0,o.jsx)(e.code,{children:\"MatchingPosts\"}),\" component.\"]})]})}function l(t={}){let{wrapper:e}=t.components||{};return e?(0,o.jsx)(e,{...t,children:(0,o.jsx)(d,{...t})}):d(t)}function _(t,e){throw new Error(\"Expected \"+(e?\"component\":\"object\")+\" `\"+t+\"` to be defined: you likely forgot to import, pass, or provide it.\")}return g(j);})();\n;return Component;",[654],"https://www.epicreact.dev/workshops/react-hooks/colocate-state/solution",{"_9":586,"_587":656,"_589":657},"/app/03.03.solution/test/",[591,592,593,594,595,596],{"_9":586,"_587":659},"/app/03.03.solution/","https://stackblitz.com/github/epicweb-dev/react-hooks/tree/main/exercises/03.lifting-state/03.solution.colocate?view=editor&title=Colocate+State+%28solution%29&hidedevtools=1&terminalHeight=0&hideNavigation=1&file=index.tsx",[662,667,672],{"_20":79,"_166":476,"_564":579,"_22":80,"_24":81,"_566":580,"_581":663,"_584":664,"_597":666,"_600":601,"_291":321,"_293":294,"_9":290,"_602":83},[583],{"_9":586,"_587":588,"_589":665},[591,592,593,594,595,596],{"_9":586,"_587":599},{"_20":87,"_166":478,"_564":617,"_22":88,"_24":89,"_566":618,"_581":668,"_584":669,"_597":671,"_600":626,"_291":321,"_293":292,"_9":290,"_602":91},[620],{"_9":586,"_587":622,"_589":670},[591,592,593,594,595,596],{"_9":586,"_587":625},{"_20":95,"_166":480,"_564":640,"_22":96,"_24":97,"_566":641,"_581":673,"_584":674,"_597":676,"_600":649,"_291":321,"_293":321,"_9":290,"_602":99},[643],{"_9":586,"_587":645,"_589":675},[591,592,593,594,595,596],{"_9":586,"_587":648},[678,683,688],{"_20":83,"_166":476,"_564":604,"_22":84,"_24":85,"_566":605,"_581":679,"_584":680,"_597":682,"_600":613,"_291":321,"_293":294,"_9":320,"_614":-5},[607],{"_9":586,"_587":609,"_589":681},[591,592,593,594,595,596],{"_9":586,"_587":612},{"_20":91,"_166":478,"_564":628,"_22":92,"_24":93,"_566":629,"_581":684,"_584":685,"_597":687,"_600":637,"_291":321,"_293":292,"_9":320,"_614":-5},[631],{"_9":586,"_587":633,"_589":686},[591,592,593,594,595,596],{"_9":586,"_587":636},{"_20":99,"_166":480,"_564":651,"_22":100,"_24":101,"_566":652,"_581":689,"_584":690,"_597":692,"_600":660,"_291":321,"_293":321,"_9":320,"_614":-5},[654],{"_9":586,"_587":656,"_589":691},[591,592,593,594,595,596],{"_9":586,"_587":659},"exerciseFormEmbedUrl","https://docs.google.com/forms/d/e/1FAIpQLSf3o9xyjQepTlOTH5Z7ZwkeSTdXh6YWI_RGc9KiyD3oUN0p6w/viewform?hl=en&embedded=true&entry.1836176234=React%20Hooks%20%F0%9F%8E%A3&entry.428900931=Lifting%20State","epicVideoInfosPromise",["P",696],"exerciseFinished",{"_699":700,"_24":701},"file","/myapp/workshop-content/exercises/03.lifting-state/FINISHED.mdx","exercises/03.lifting-state/FINISHED.mdx","prevStepLink",{"_704":705,"_706":707},"to","/exercise/03/03/solution","aria-label","Colocate State (solution)","nextStepLink",{"_704":710,"_706":496},"/exercise/04","actionData","errors"]

03. Lifting State/Elaboration