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\",(0,n.jsx)(e.span,{style:{color:\"var(--base0E)\"},children:\"readonly\"}),\" [\",(0,n.jsx)(e.span,{style:{color:\"var(--base0C)\"},children:\"number\"}),\", \",(0,n.jsx)(e.span,{style:{color:\"var(--base0A)\"},children:\"Dispatch\"}),\"<\",(0,n.jsx)(e.span,{style:{color:\"var(--base0A)\"},children:\"SetStateAction\"}),\"<\",(0,n.jsx)(e.span,{style:{color:\"var(--base0C)\"},children:\"number\"}),\">>]\",`\n`]}),(0,n.jsxs)(e.span,{className:\"codeblock-line\",\"data-line-number\":\"2\",children:[(0,n.jsx)(e.span,{style:{color:\"var(--base0A)\"},children:\"const\"}),\" \",(0,n.jsx)(e.span,{style:{color:\"var(--base08)\"},children:\"CountContext\"}),\" \",(0,n.jsx)(e.span,{style:{color:\"var(--base0E)\"},children:\"=\"}),\" \",(0,n.jsx)(e.span,{style:{color:\"var(--base0D)\"},children:\"createContext\"}),\"<\",(0,n.jsx)(e.span,{style:{color:\"var(--base0A)\"},children:\"CountContextValue\"}),\" \",(0,n.jsx)(e.span,{style:{color:\"var(--base0E)\"},children:\"|\"}),\" \",(0,n.jsx)(e.span,{style:{color:\"var(--base0C)\"},children:\"null\"}),\">(\",(0,n.jsx)(e.span,{style:{color:\"var(--base09)\"},children:\"null\"}),\")\",`\n`]}),(0,n.jsx)(e.span,{className:\"codeblock-line\",\"data-line-number\":\"3\",children:`\n`}),(0,n.jsxs)(e.span,{className:\"codeblock-line\",\"data-line-number\":\"4\",children:[(0,n.jsx)(e.span,{style:{color:\"var(--base0D)\"},children:\"function\"}),\" \",(0,n.jsx)(e.span,{style:{color:\"var(--base0D)\"},children:\"CountProvider\"}),\"(\",(0,n.jsx)(e.span,{style:{color:\"var(--base08)\"},children:\"props\"}),\") {\",`\n`]}),(0,n.jsxs)(e.span,{className:\"codeblock-line\",\"data-line-number\":\"5\",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.jsxs)(e.span,{className:\"codeblock-line\",\"data-line-number\":\"6\",children:[\"\t\",(0,n.jsx)(e.span,{style:{color:\"var(--base0A)\"},children:\"const\"}),\" \",(0,n.jsx)(e.span,{style:{color:\"var(--base08)\"},children:\"value\"}),\" \",(0,n.jsx)(e.span,{style:{color:\"var(--base0E)\"},children:\"=\"}),\" [\",(0,n.jsx)(e.span,{style:{color:\"var(--base08)\"},children:\"count\"}),\", \",(0,n.jsx)(e.span,{style:{color:\"var(--base08)\"},children:\"setCount\"}),\"]\",`\n`]}),(0,n.jsxs)(e.span,{className:\"codeblock-line\",\"data-line-number\":\"7\",children:[\"\t\",(0,n.jsx)(e.span,{style:{color:\"var(--base0E)\"},children:\"return\"}),\" <\",(0,n.jsx)(e.span,{style:{color:\"var(--base0A)\"},children:\"CountContext\"}),\" \",(0,n.jsx)(e.span,{style:{color:\"var(--base0D)\"},children:\"value\"}),(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(--base08)\"},children:\"value\"}),(0,n.jsx)(e.span,{style:{color:\"var(--base0F)\"},children:\"}\"}),\" \",(0,n.jsx)(e.span,{style:{color:\"var(--base0F)\"},children:\"{\"}),(0,n.jsx)(e.span,{style:{color:\"var(--base0E)\"},children:\"...\"}),(0,n.jsx)(e.span,{style:{color:\"var(--base08)\"},children:\"props\"}),(0,n.jsx)(e.span,{style:{color:\"var(--base0F)\"},children:\"}\"}),\" />\",`\n`]}),(0,n.jsxs)(e.span,{className:\"codeblock-line\",\"data-line-number\":\"8\",children:[\"}\",`\n`]})]})}),`\n`,(0,n.jsxs)(e.p,{children:[\"Every time the \",(0,n.jsx)(e.code,{children:\"\"}),\" is re-rendered, the \",(0,n.jsx)(e.code,{children:\"value\"}),` is brand new, so\neven though the `,(0,n.jsx)(e.code,{children:\"count\"}),` value itself may stay the same, all component consumers\nwill be re-rendered.`]}),`\n`,(0,n.jsx)(e.p,{children:\"This can be problematic in certain scenarios.\"}),`\n`,(0,n.jsx)(e.p,{children:`The quick and easy solution to this problem is to memoize the value that you\nprovide to the context provider:`}),`\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(--base0A)\"},children:\"type\"}),\" \",(0,n.jsx)(e.span,{style:{color:\"var(--base0A)\"},children:\"CountContextValue\"}),\" \",(0,n.jsx)(e.span,{style:{color:\"var(--base0E)\"},children:\"=\"}),\" \",(0,n.jsx)(e.span,{style:{color:\"var(--base0E)\"},children:\"readonly\"}),\" [\",(0,n.jsx)(e.span,{style:{color:\"var(--base0C)\"},children:\"number\"}),\", \",(0,n.jsx)(e.span,{style:{color:\"var(--base0A)\"},children:\"Dispatch\"}),\"<\",(0,n.jsx)(e.span,{style:{color:\"var(--base0A)\"},children:\"SetStateAction\"}),\"<\",(0,n.jsx)(e.span,{style:{color:\"var(--base0C)\"},children:\"number\"}),\">>]\",`\n`]}),(0,n.jsxs)(e.span,{className:\"codeblock-line\",\"data-line-number\":\"2\",children:[(0,n.jsx)(e.span,{style:{color:\"var(--base0A)\"},children:\"const\"}),\" \",(0,n.jsx)(e.span,{style:{color:\"var(--base08)\"},children:\"CountContext\"}),\" \",(0,n.jsx)(e.span,{style:{color:\"var(--base0E)\"},children:\"=\"}),\" \",(0,n.jsx)(e.span,{style:{color:\"var(--base0D)\"},children:\"createContext\"}),\"<\",(0,n.jsx)(e.span,{style:{color:\"var(--base0A)\"},children:\"CountContextValue\"}),\" \",(0,n.jsx)(e.span,{style:{color:\"var(--base0E)\"},children:\"|\"}),\" \",(0,n.jsx)(e.span,{style:{color:\"var(--base0C)\"},children:\"null\"}),\">(\",(0,n.jsx)(e.span,{style:{color:\"var(--base09)\"},children:\"null\"}),\")\",`\n`]}),(0,n.jsx)(e.span,{className:\"codeblock-line\",\"data-line-number\":\"3\",children:`\n`}),(0,n.jsxs)(e.span,{className:\"codeblock-line\",\"data-line-number\":\"4\",children:[(0,n.jsx)(e.span,{style:{color:\"var(--base0D)\"},children:\"function\"}),\" \",(0,n.jsx)(e.span,{style:{color:\"var(--base0D)\"},children:\"CountProvider\"}),\"(\",(0,n.jsx)(e.span,{style:{color:\"var(--base08)\"},children:\"props\"}),\") {\",`\n`]}),(0,n.jsxs)(e.span,{className:\"codeblock-line\",\"data-line-number\":\"5\",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.jsxs)(e.span,{className:\"codeblock-line\",\"data-highlight\":\"true\",\"data-line-number\":\"6\",children:[\"\t\",(0,n.jsx)(e.span,{style:{color:\"var(--base0A)\"},children:\"const\"}),\" \",(0,n.jsx)(e.span,{style:{color:\"var(--base08)\"},children:\"value\"}),\" \",(0,n.jsx)(e.span,{style:{color:\"var(--base0E)\"},children:\"=\"}),\" \",(0,n.jsx)(e.span,{style:{color:\"var(--base0D)\"},children:\"useMemo\"}),\"(() \",(0,n.jsx)(e.span,{style:{color:\"var(--base0D)\"},children:\"=>\"}),\" [\",(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(--base08)\"},children:\"count\"}),\"])\",`\n`]}),(0,n.jsxs)(e.span,{className:\"codeblock-line\",\"data-line-number\":\"7\",children:[\"\t\",(0,n.jsx)(e.span,{style:{color:\"var(--base0E)\"},children:\"return\"}),\" <\",(0,n.jsx)(e.span,{style:{color:\"var(--base0A)\"},children:\"CountContext\"}),\" \",(0,n.jsx)(e.span,{style:{color:\"var(--base0D)\"},children:\"value\"}),(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(--base08)\"},children:\"value\"}),(0,n.jsx)(e.span,{style:{color:\"var(--base0F)\"},children:\"}\"}),\" \",(0,n.jsx)(e.span,{style:{color:\"var(--base0F)\"},children:\"{\"}),(0,n.jsx)(e.span,{style:{color:\"var(--base0E)\"},children:\"...\"}),(0,n.jsx)(e.span,{style:{color:\"var(--base08)\"},children:\"props\"}),(0,n.jsx)(e.span,{style:{color:\"var(--base0F)\"},children:\"}\"}),\" />\",`\n`]}),(0,n.jsxs)(e.span,{className:\"codeblock-line\",\"data-line-number\":\"8\",children:[\"}\",`\n`]})]})}),`\n`,(0,n.jsxs)(e.p,{children:[`By memoizing the value, you're ensuring that the value is only re-created when\nthe `,(0,n.jsx)(e.code,{children:\"count\"}),` value changes. As a result, the consuming components will only\nrerender when the `,(0,n.jsx)(e.code,{children:\"count\"}),\" value changes.\"]})]})}function h(a={}){let{wrapper:e}=a.components||{};return e?(0,n.jsx)(e,{...a,children:(0,n.jsx)(d,{...a})}):d(a)}function A(a,e){throw new Error(\"Expected \"+(e?\"component\":\"object\")+\" `\"+a+\"` to be defined: you likely forgot to import, pass, or provide it.\")}return k(g);})();\n;return Component;","finishedCode","var Component=(()=>{var u=Object.create;var i=Object.defineProperty;var f=Object.getOwnPropertyDescriptor;var x=Object.getOwnPropertyNames;var h=Object.getPrototypeOf,w=Object.prototype.hasOwnProperty;var l=(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})},s=(e,t,o,c)=>{if(t&&typeof t==\"object\"||typeof t==\"function\")for(let r of x(t))!w.call(e,r)&&r!==o&&i(e,r,{get:()=>t[r],enumerable:!(c=f(t,r))||c.enumerable});return e};var j=(e,t,o)=>(o=e!=null?u(h(e)):{},s(t||!e||!e.__esModule?i(o,\"default\",{value:e,enumerable:!0}):o,e)),k=e=>s(i({},\"__esModule\",{value:!0}),e);var p=l((E,a)=>{a.exports=_jsx_runtime});var y={};_(y,{default:()=>m,frontmatter:()=>b});var n=j(p()),b=void 0;function d(e){let t={h1:\"h1\",p:\"p\",...e.components},{EpicVideo:o}=t;return o||g(\"EpicVideo\",!0),(0,n.jsxs)(n.Fragment,{children:[(0,n.jsx)(t.h1,{children:\"Optimize Context\"}),`\n`,(0,n.jsx)(o,{url:\"https://www.epicreact.dev/workshops/react-performance/dad-joke-break-optimize-context\"}),`\n`,(0,n.jsx)(t.p,{children:`\\u{1F468}\\u200D\\u{1F4BC} Great work! You now have some great context optimizations in your back\npocket to use whenever you run into performance problems (and not before!!).`})]})}function m(e={}){let{wrapper:t}=e.components||{};return t?(0,n.jsx)(t,{...e,children:(0,n.jsx)(d,{...e})}):d(e)}function g(e,t){throw new Error(\"Expected \"+(t?\"component\":\"object\")+\" `\"+e+\"` to be defined: you likely forgot to import, pass, or provide it.\")}return k(y);})();\n;return Component;","instructionsEpicVideoEmbeds",[542],"https://www.epicreact.dev/workshops/react-performance/intro-to-optimize-context","finishedEpicVideoEmbeds",[545],"https://www.epicreact.dev/workshops/react-performance/dad-joke-break-optimize-context",[547,580,604],{"_312":311,"_309":548,"_320":568},{"_20":63,"_186":411,"_534":549,"_22":64,"_24":65,"_536":550,"_551":552,"_554":555,"_562":563,"_565":566,"_310":363,"_312":311,"_9":309,"_567":67},"01.problem.memo-context","var Component=(()=>{var u=Object.create;var i=Object.defineProperty;var m=Object.getOwnPropertyDescriptor;var f=Object.getOwnPropertyNames;var w=Object.getPrototypeOf,x=Object.prototype.hasOwnProperty;var y=(n,e)=>()=>(e||n((e={exports:{}}).exports,e),e.exports),v=(n,e)=>{for(var t in e)i(n,t,{get:e[t],enumerable:!0})},d=(n,e,t,r)=>{if(e&&typeof e==\"object\"||typeof e==\"function\")for(let c of f(e))!x.call(n,c)&&c!==t&&i(n,c,{get:()=>e[c],enumerable:!(r=m(e,c))||r.enumerable});return n};var g=(n,e,t)=>(t=n!=null?u(w(n)):{},d(e||!n||!n.__esModule?i(t,\"default\",{value:n,enumerable:!0}):t,n)),_=n=>d(i({},\"__esModule\",{value:!0}),n);var s=y((M,h)=>{h.exports=_jsx_runtime});var F={};v(F,{default:()=>p,frontmatter:()=>k});var o=g(s()),k=void 0;function a(n){let e={code:\"code\",h1:\"h1\",p:\"p\",...n.components},{EpicVideo:t,PrevDiffLink:r}=e;return t||l(\"EpicVideo\",!0),r||l(\"PrevDiffLink\",!0),(0,o.jsxs)(o.Fragment,{children:[(0,o.jsx)(e.h1,{children:\"Memoize Context\"}),`\n`,(0,o.jsx)(t,{url:\"https://www.epicreact.dev/workshops/react-performance/memoize-context\"}),`\n`,(0,o.jsxs)(e.p,{children:[\"\\u{1F9DD}\\u200D\\u2642\\uFE0F I've taken the \",(0,o.jsx)(e.code,{children:\"name\"}),\" and \",(0,o.jsx)(e.code,{children:\"color\"}),` state and combined them into a single\n`,(0,o.jsx)(e.code,{children:\"FooterContext\"}),\" as well as extracted some of the UI into a \",(0,o.jsx)(e.code,{children:\"FooterSetters\"}),`\ncomponent (for all the stuff that allows you to control the `,(0,o.jsx)(e.code,{children:\"Footer\"}),`). Feel free\nto `,(0,o.jsx)(r,{children:\"check my work\"}),` to inspect the changes if you\nwant.`]}),`\n`,(0,o.jsxs)(e.p,{children:[`\\u{1F468}\\u200D\\u{1F4BC} Great, now if you pull up the React DevTools, you'll notice all the\ncomponents rerender whenever you change the counter in the App component. This\nis happening because the `,(0,o.jsx)(e.code,{children:\"FooterContext\"}),\" is a new \",(0,o.jsx)(e.code,{children:\"value\"}),` prop every\nrender.`]}),`\n`,(0,o.jsxs)(e.p,{children:[\"So if you memoize the \",(0,o.jsx)(e.code,{children:\"value\"}),\" prop with \",(0,o.jsx)(e.code,{children:\"useMemo\"}),`, you can prevent the\nunnecessary rerender of consuming components when the `,(0,o.jsx)(e.code,{children:\"value\"}),` prop doesn't\nchange.`]})]})}function p(n={}){let{wrapper:e}=n.components||{};return e?(0,o.jsx)(e,{...n,children:(0,o.jsx)(a,{...n})}):a(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 _(F);})();\n;return Component;","epicVideoEmbeds",[553],"https://www.epicreact.dev/workshops/react-performance/memoize-context","test",{"_9":556,"_557":558,"_559":560},"browser","pathname","/app/02.01.problem/test/","testFiles",[561],"memo-context.test.ts","dev",{"_9":556,"_557":564},"/app/02.01.problem/","stackBlitzUrl","https://stackblitz.com/github/epicweb-dev/react-performance/tree/main/exercises/02.context/01.problem.memo-context?view=editor&title=Memoize+Context+%28problem%29&hidedevtools=1&terminalHeight=0&hideNavigation=1&file=index.tsx","solutionName",{"_20":67,"_186":411,"_534":569,"_22":68,"_24":69,"_536":570,"_551":571,"_554":573,"_562":576,"_565":578,"_310":363,"_312":311,"_9":320,"_579":-5},"01.solution.memo-context","var Component=(()=>{var u=Object.create;var i=Object.defineProperty;var l=Object.getOwnPropertyDescriptor;var x=Object.getOwnPropertyNames;var f=Object.getPrototypeOf,h=Object.prototype.hasOwnProperty;var w=(e,n)=>()=>(n||e((n={exports:{}}).exports,n),n.exports),_=(e,n)=>{for(var o in n)i(e,o,{get:n[o],enumerable:!0})},s=(e,n,o,c)=>{if(n&&typeof n==\"object\"||typeof n==\"function\")for(let r of x(n))!h.call(e,r)&&r!==o&&i(e,r,{get:()=>n[r],enumerable:!(c=l(n,r))||c.enumerable});return e};var g=(e,n,o)=>(o=e!=null?u(f(e)):{},s(n||!e||!e.__esModule?i(o,\"default\",{value:e,enumerable:!0}):o,e)),j=e=>s(i({},\"__esModule\",{value:!0}),e);var d=w((k,p)=>{p.exports=_jsx_runtime});var b={};_(b,{default:()=>m,frontmatter:()=>y});var t=g(d()),y=void 0;function a(e){let n={h1:\"h1\",p:\"p\",...e.components},{EpicVideo:o}=n;return o||M(\"EpicVideo\",!0),(0,t.jsxs)(t.Fragment,{children:[(0,t.jsx)(n.h1,{children:\"Memoize Context\"}),`\n`,(0,t.jsx)(o,{url:\"https://www.epicreact.dev/workshops/react-performance/memoize-context/solution\"}),`\n`,(0,t.jsx)(n.p,{children:`\\u{1F468}\\u200D\\u{1F4BC} Super duper! You've been able to keep our components rerendering only when\nnecessary again. Well done.`})]})}function m(e={}){let{wrapper:n}=e.components||{};return n?(0,t.jsx)(n,{...e,children:(0,t.jsx)(a,{...e})}):a(e)}function M(e,n){throw new Error(\"Expected \"+(n?\"component\":\"object\")+\" `\"+e+\"` to be defined: you likely forgot to import, pass, or provide it.\")}return j(b);})();\n;return Component;",[572],"https://www.epicreact.dev/workshops/react-performance/memoize-context/solution",{"_9":556,"_557":574,"_559":575},"/app/02.01.solution/test/",[561],{"_9":556,"_557":577},"/app/02.01.solution/","https://stackblitz.com/github/epicweb-dev/react-performance/tree/main/exercises/02.context/01.solution.memo-context?view=editor&title=Memoize+Context+%28solution%29&hidedevtools=1&terminalHeight=0&hideNavigation=1&file=index.tsx","problemName",{"_312":363,"_309":581,"_320":593},{"_20":71,"_186":413,"_534":582,"_22":72,"_24":73,"_536":583,"_551":584,"_554":586,"_562":590,"_565":592,"_310":363,"_312":363,"_9":309,"_567":75},"02.problem.provider-component","var Component=(()=>{var p=Object.create;var c=Object.defineProperty;var m=Object.getOwnPropertyDescriptor;var f=Object.getOwnPropertyNames;var u=Object.getPrototypeOf,g=Object.prototype.hasOwnProperty;var w=(n,e)=>()=>(e||n((e={exports:{}}).exports,e),e.exports),x=(n,e)=>{for(var t in e)c(n,t,{get:e[t],enumerable:!0})},d=(n,e,t,i)=>{if(e&&typeof e==\"object\"||typeof e==\"function\")for(let r of f(e))!g.call(n,r)&&r!==t&&c(n,r,{get:()=>e[r],enumerable:!(i=m(e,r))||i.enumerable});return n};var v=(n,e,t)=>(t=n!=null?p(u(n)):{},d(e||!n||!n.__esModule?c(t,\"default\",{value:n,enumerable:!0}):t,n)),y=n=>d(c({},\"__esModule\",{value:!0}),n);var a=w((b,h)=>{h.exports=_jsx_runtime});var j={};x(j,{default:()=>l,frontmatter:()=>F});var o=v(a()),F=void 0;function s(n){let e={code:\"code\",h1:\"h1\",p:\"p\",...n.components},{EpicVideo:t}=e;return t||_(\"EpicVideo\",!0),(0,o.jsxs)(o.Fragment,{children:[(0,o.jsx)(e.h1,{children:\"Provider Component\"}),`\n`,(0,o.jsx)(t,{url:\"https://www.epicreact.dev/workshops/react-performance/provider-component\"}),`\n`,(0,o.jsxs)(e.p,{children:[`\\u{1F468}\\u200D\\u{1F4BC} We've noticed that when we change some of the Footer context stuff, we're\nactually rerendering the `,(0,o.jsx)(e.code,{children:\"App\"}),\" and \",(0,o.jsx)(e.code,{children:\"Main\"}),` components even though those don't\nhave anything to do with the Footer context.`]}),`\n`,(0,o.jsxs)(e.p,{children:[`So we're going to take advantage of React's optimizations for reusing elements\nby creating a `,(0,o.jsx)(e.code,{children:\"FooterProvider\"}),\" component and accepting \",(0,o.jsx)(e.code,{children:\"children\"}),`. That way\nwhenever the Footer context changes, only the `,(0,o.jsx)(e.code,{children:\"FooterProvider\"}),` component and its\nconsumers will rerender. React will be able to reuse the `,(0,o.jsx)(e.code,{children:\"children\"}),` element\nsince that doesn't change when the Footer's state changes.`]}),`\n`,(0,o.jsxs)(e.p,{children:[`When you're finished, changing the footer color of setting the footer name\nshould not cause the `,(0,o.jsx)(e.code,{children:\"App\"}),\" or \",(0,o.jsx)(e.code,{children:\"Main\"}),\" components to rerender.\"]})]})}function l(n={}){let{wrapper:e}=n.components||{};return e?(0,o.jsx)(e,{...n,children:(0,o.jsx)(s,{...n})}):s(n)}function _(n,e){throw new Error(\"Expected \"+(e?\"component\":\"object\")+\" `\"+n+\"` to be defined: you likely forgot to import, pass, or provide it.\")}return y(j);})();\n;return Component;",[585],"https://www.epicreact.dev/workshops/react-performance/provider-component",{"_9":556,"_557":587,"_559":588},"/app/02.02.problem/test/",[589],"provider.test.ts",{"_9":556,"_557":591},"/app/02.02.problem/","https://stackblitz.com/github/epicweb-dev/react-performance/tree/main/exercises/02.context/02.problem.provider-component?view=editor&title=Provider+Component+%28problem%29&hidedevtools=1&terminalHeight=0&hideNavigation=1&file=index.tsx",{"_20":75,"_186":413,"_534":594,"_22":76,"_24":77,"_536":595,"_551":596,"_554":598,"_562":601,"_565":603,"_310":363,"_312":363,"_9":320,"_579":-5},"02.solution.provider-component","var Component=(()=>{var h=Object.create;var i=Object.defineProperty;var u=Object.getOwnPropertyDescriptor;var l=Object.getOwnPropertyNames;var f=Object.getPrototypeOf,x=Object.prototype.hasOwnProperty;var w=(t,e)=>()=>(e||t((e={exports:{}}).exports,e),e.exports),y=(t,e)=>{for(var n in e)i(t,n,{get:e[n],enumerable:!0})},a=(t,e,n,s)=>{if(e&&typeof e==\"object\"||typeof e==\"function\")for(let r of l(e))!x.call(t,r)&&r!==n&&i(t,r,{get:()=>e[r],enumerable:!(s=u(e,r))||s.enumerable});return t};var _=(t,e,n)=>(n=t!=null?h(f(t)):{},a(e||!t||!t.__esModule?i(n,\"default\",{value:t,enumerable:!0}):n,t)),j=t=>a(i({},\"__esModule\",{value:!0}),t);var m=w((E,c)=>{c.exports=_jsx_runtime});var g={};y(g,{default:()=>d,frontmatter:()=>k});var o=_(m()),k=void 0;function p(t){let e={h1:\"h1\",p:\"p\",...t.components},{EpicVideo:n}=e;return n||v(\"EpicVideo\",!0),(0,o.jsxs)(o.Fragment,{children:[(0,o.jsx)(e.h1,{children:\"Provider Component\"}),`\n`,(0,o.jsx)(n,{url:\"https://www.epicreact.dev/workshops/react-performance/provider-component/solution\"}),`\n`,(0,o.jsx)(e.p,{children:\"\\u{1F468}\\u200D\\u{1F4BC} Great work! You've eliminated more unnecessary rerenders!\"}),`\n`,(0,o.jsx)(e.p,{children:`\\u{1F989} This is a really common pattern in the React community. It's kind of natural.\nIt just means that people are benefiting from the optimizations that React\nhas without thinking about it! However, this next one is not very common (and\nas is the case with most of these optimizations not normally necessary). But\nit's pretty handy in certain scenarios! Let's take a look.`})]})}function d(t={}){let{wrapper:e}=t.components||{};return e?(0,o.jsx)(e,{...t,children:(0,o.jsx)(p,{...t})}):p(t)}function v(t,e){throw new Error(\"Expected \"+(e?\"component\":\"object\")+\" `\"+t+\"` to be defined: you likely forgot to import, pass, or provide it.\")}return j(g);})();\n;return Component;",[597],"https://www.epicreact.dev/workshops/react-performance/provider-component/solution",{"_9":556,"_557":599,"_559":600},"/app/02.02.solution/test/",[589],{"_9":556,"_557":602},"/app/02.02.solution/","https://stackblitz.com/github/epicweb-dev/react-performance/tree/main/exercises/02.context/02.solution.provider-component?view=editor&title=Provider+Component+%28solution%29&hidedevtools=1&terminalHeight=0&hideNavigation=1&file=index.tsx",{"_312":337,"_309":605,"_320":617},{"_20":79,"_186":415,"_534":606,"_22":80,"_24":81,"_536":607,"_551":608,"_554":610,"_562":614,"_565":616,"_310":363,"_312":337,"_9":309,"_567":83},"03.problem.split-context","var Component=(()=>{var p=Object.create;var s=Object.defineProperty;var b=Object.getOwnPropertyDescriptor;var v=Object.getOwnPropertyNames;var m=Object.getPrototypeOf,u=Object.prototype.hasOwnProperty;var y=(r,e)=>()=>(e||r((e={exports:{}}).exports,e),e.exports),f=(r,e)=>{for(var a in e)s(r,a,{get:e[a],enumerable:!0})},l=(r,e,a,o)=>{if(e&&typeof e==\"object\"||typeof e==\"function\")for(let t of v(e))!u.call(r,t)&&t!==a&&s(r,t,{get:()=>e[t],enumerable:!(o=b(e,t))||o.enumerable});return r};var x=(r,e,a)=>(a=r!=null?p(m(r)):{},l(e||!r||!r.__esModule?s(a,\"default\",{value:r,enumerable:!0}):a,r)),w=r=>l(s({},\"__esModule\",{value:!0}),r);var i=y((D,c)=>{c.exports=_jsx_runtime});var S={};f(S,{default:()=>h,frontmatter:()=>g});var n=x(i()),g=void 0;function d(r){let e={code:\"code\",em:\"em\",h1:\"h1\",p:\"p\",pre:\"pre\",span:\"span\",...r.components},{EpicVideo:a}=e;return a||k(\"EpicVideo\",!0),(0,n.jsxs)(n.Fragment,{children:[(0,n.jsx)(e.h1,{children:\"Split Context\"}),`\n`,(0,n.jsx)(a,{url:\"https://www.epicreact.dev/workshops/react-performance/split-context\"}),`\n`,(0,n.jsxs)(e.p,{children:[\"\\u{1F468}\\u200D\\u{1F4BC} Something you may have noticed is that the \",(0,n.jsx)(e.code,{children:\"FooterSetters\"}),` component is\nrerendering whenever the footer state changes, but that component doesn't\nactually depend on the footer state at all. All it cares about is the setter\nfunctions which never change!`]}),`\n`,(0,n.jsxs)(e.p,{children:[\"Let's assume that \",(0,n.jsx)(e.code,{children:\"FooterSetters\"}),` is an expensive component to render. How could\nwe prevent it from rerendering unnecessarily when the footer state changes?`]}),`\n`,(0,n.jsx)(e.p,{children:`How about you split the context into two separate contexts: one for the state\nand one for the setters. For 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(--base0D)\"},children:\"function\"}),\" \",(0,n.jsx)(e.span,{style:{color:\"var(--base0D)\"},children:\"SomeProvider\"}),\"() {\",`\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:\"state\"}),\", \",(0,n.jsx)(e.span,{style:{color:\"var(--base08)\"},children:\"setState\"}),\"] \",(0,n.jsx)(e.span,{style:{color:\"var(--base0E)\"},children:\"=\"}),\" \",(0,n.jsx)(e.span,{style:{color:\"var(--base0D)\"},children:\"useState\"}),\"()\",`\n`]}),(0,n.jsxs)(e.span,{className:\"codeblock-line\",\"data-line-number\":\"3\",children:[\"\t\",(0,n.jsx)(e.span,{style:{color:\"var(--base0A)\"},children:\"const\"}),\" \",(0,n.jsx)(e.span,{style:{color:\"var(--base08)\"},children:\"setters\"}),\" \",(0,n.jsx)(e.span,{style:{color:\"var(--base0E)\"},children:\"=\"}),\" \",(0,n.jsx)(e.span,{style:{color:\"var(--base0D)\"},children:\"useMemo\"}),\"(() \",(0,n.jsx)(e.span,{style:{color:\"var(--base0D)\"},children:\"=>\"}),\" ({ \",(0,n.jsx)(e.span,{style:{color:\"var(--base08)\"},children:\"setState\"}),\" }), [\",(0,n.jsx)(e.span,{style:{color:\"var(--base08)\"},children:\"setState\"}),\"])\",`\n`]}),(0,n.jsxs)(e.span,{className:\"codeblock-line\",\"data-line-number\":\"4\",children:[\"\t\",(0,n.jsx)(e.span,{style:{color:\"var(--base0A)\"},children:\"const\"}),\" \",(0,n.jsx)(e.span,{style:{color:\"var(--base08)\"},children:\"stateValue\"}),\" \",(0,n.jsx)(e.span,{style:{color:\"var(--base0E)\"},children:\"=\"}),\" \",(0,n.jsx)(e.span,{style:{color:\"var(--base0D)\"},children:\"useMemo\"}),\"(() \",(0,n.jsx)(e.span,{style:{color:\"var(--base0D)\"},children:\"=>\"}),\" ({ \",(0,n.jsx)(e.span,{style:{color:\"var(--base08)\"},children:\"state\"}),\" }), [\",(0,n.jsx)(e.span,{style:{color:\"var(--base08)\"},children:\"state\"}),\"])\",`\n`]}),(0,n.jsxs)(e.span,{className:\"codeblock-line\",\"data-line-number\":\"5\",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\":\"6\",children:[\"\t\t<\",(0,n.jsx)(e.span,{style:{color:\"var(--base0A)\"},children:\"StateContext\"}),\" \",(0,n.jsx)(e.span,{style:{color:\"var(--base0D)\"},children:\"value\"}),(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(--base08)\"},children:\"stateValue\"}),(0,n.jsx)(e.span,{style:{color:\"var(--base0F)\"},children:\"}\"}),\">\",`\n`]}),(0,n.jsxs)(e.span,{className:\"codeblock-line\",\"data-line-number\":\"7\",children:[\"\t\t\t<\",(0,n.jsx)(e.span,{style:{color:\"var(--base0A)\"},children:\"SettersContext\"}),\" \",(0,n.jsx)(e.span,{style:{color:\"var(--base0D)\"},children:\"value\"}),(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(--base08)\"},children:\"setters\"}),(0,n.jsx)(e.span,{style:{color:\"var(--base0F)\"},children:\"}\"}),\">\",(0,n.jsx)(e.span,{style:{color:\"var(--base0F)\"},children:\"{\"}),(0,n.jsx)(e.span,{style:{color:\"var(--base08)\"},children:\"children\"}),(0,n.jsx)(e.span,{style:{color:\"var(--base0F)\"},children:\"}\"}),\"\",`\n`]}),(0,n.jsxs)(e.span,{className:\"codeblock-line\",\"data-line-number\":\"8\",children:[\"\t\t\",`\n`]}),(0,n.jsxs)(e.span,{className:\"codeblock-line\",\"data-line-number\":\"9\",children:[\"\t)\",`\n`]}),(0,n.jsxs)(e.span,{className:\"codeblock-line\",\"data-line-number\":\"10\",children:[\"}\",`\n`]})]})}),`\n`,(0,n.jsxs)(e.p,{children:[\"This way, \",(0,n.jsx)(e.code,{children:\"FooterSetters\"}),` can consume only the setters\n(which never change)!`]}),`\n`,(0,n.jsxs)(e.p,{children:[\"Give that a shot in this exercise (and for extra credit you can also \",(0,n.jsx)(e.code,{children:\"memo\"}),`-ize\nthe `,(0,n.jsx)(e.code,{children:\"FooterSetters\"}),\" component and it will \",(0,n.jsx)(e.em,{children:\"never\"}),\" rerender!).\"]}),`\n`,(0,n.jsx)(e.p,{children:`This is going to require a fair bit of refactoring, but it should be pretty\nquick. Make sure you check out how components rerender in the React DevTools!`})]})}function h(r={}){let{wrapper:e}=r.components||{};return e?(0,n.jsx)(e,{...r,children:(0,n.jsx)(d,{...r})}):d(r)}function k(r,e){throw new Error(\"Expected \"+(e?\"component\":\"object\")+\" `\"+r+\"` to be defined: you likely forgot to import, pass, or provide it.\")}return w(S);})();\n;return Component;",[609],"https://www.epicreact.dev/workshops/react-performance/split-context",{"_9":556,"_557":611,"_559":612},"/app/02.03.problem/test/",[613],"split.test.ts",{"_9":556,"_557":615},"/app/02.03.problem/","https://stackblitz.com/github/epicweb-dev/react-performance/tree/main/exercises/02.context/03.problem.split-context?view=editor&title=Split+Context+%28problem%29&hidedevtools=1&terminalHeight=0&hideNavigation=1&file=index.tsx",{"_20":83,"_186":415,"_534":618,"_22":84,"_24":85,"_536":619,"_551":620,"_554":622,"_562":625,"_565":627,"_310":363,"_312":337,"_9":320,"_579":-5},"03.solution.split-context","var Component=(()=>{var u=Object.create;var s=Object.defineProperty;var h=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 o in t)s(e,o,{get:t[o],enumerable:!0})},i=(e,t,o,c)=>{if(t&&typeof t==\"object\"||typeof t==\"function\")for(let r of f(t))!x.call(e,r)&&r!==o&&s(e,r,{get:()=>t[r],enumerable:!(c=h(t,r))||c.enumerable});return e};var g=(e,t,o)=>(o=e!=null?u(l(e)):{},i(t||!e||!e.__esModule?s(o,\"default\",{value:e,enumerable:!0}):o,e)),j=e=>i(s({},\"__esModule\",{value:!0}),e);var a=w((b,p)=>{p.exports=_jsx_runtime});var E={};_(E,{default:()=>m,frontmatter:()=>y});var n=g(a()),y=void 0;function d(e){let t={h1:\"h1\",p:\"p\",...e.components},{EpicVideo:o}=t;return o||v(\"EpicVideo\",!0),(0,n.jsxs)(n.Fragment,{children:[(0,n.jsx)(t.h1,{children:\"Split Context\"}),`\n`,(0,n.jsx)(o,{url:\"https://www.epicreact.dev/workshops/react-performance/split-context/solution\"}),`\n`,(0,n.jsx)(t.p,{children:`\\u{1F468}\\u200D\\u{1F4BC} You've done good work! 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02. Optimize Context/Elaboration