Initial

.eslintrc.json

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+{
+  "extends": "next/core-web-vitals"
+}

.gitignore

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+# See https://help.github.com/articles/ignoring-files/ for more about ignoring files.
+
+# dependencies
+/node_modules
+/.pnp
+.pnp.js
+
+# testing
+/coverage
+
+# next.js
+/.next/
+/out/
+
+# production
+/build
+
+# misc
+.DS_Store
+*.pem
+
+# debug
+npm-debug.log*
+yarn-debug.log*
+yarn-error.log*
+
+# local env files
+.env*.local
+
+# vercel
+.vercel
+
+# typescript
+*.tsbuildinfo
+next-env.d.ts

README.md

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+This is a [Next.js](https://nextjs.org/) project bootstrapped with [`create-next-app`](https://github.com/vercel/next.js/tree/canary/packages/create-next-app).
+
+## Getting Started
+
+First, run the development server:
+
+```bash
+npm run dev
+# or
+yarn dev
+# or
+pnpm dev
+```
+
+Open [http://localhost:3000](http://localhost:3000) with your browser to see the result.
+
+You can start editing the page by modifying `pages/index.tsx`. The page auto-updates as you edit the file.
+
+[API routes](https://nextjs.org/docs/api-routes/introduction) can be accessed on [http://localhost:3000/api/hello](http://localhost:3000/api/hello). This endpoint can be edited in `pages/api/hello.ts`.
+
+The `pages/api` directory is mapped to `/api/*`. Files in this directory are treated as [API routes](https://nextjs.org/docs/api-routes/introduction) instead of React pages.
+
+This project uses [`next/font`](https://nextjs.org/docs/basic-features/font-optimization) to automatically optimize and load Inter, a custom Google Font.
+
+## Learn More
+
+To learn more about Next.js, take a look at the following resources:
+
+- [Next.js Documentation](https://nextjs.org/docs) - learn about Next.js features and API.
+- [Learn Next.js](https://nextjs.org/learn) - an interactive Next.js tutorial.
+
+You can check out [the Next.js GitHub repository](https://github.com/vercel/next.js/) - your feedback and contributions are welcome!
+
+## Deploy on Vercel
+
+The easiest way to deploy your Next.js app is to use the [Vercel Platform](https://vercel.com/new?utm_medium=default-template&filter=next.js&utm_source=create-next-app&utm_campaign=create-next-app-readme) from the creators of Next.js.
+
+Check out our [Next.js deployment documentation](https://nextjs.org/docs/deployment) for more details.

components/LessonContainer.tsx

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+import useSWR from "swr";
+import ReactMarkdown from "react-markdown";
+
+const fetcher = (...args) => fetch(...args).then((res) => res.json());
+
+const LessonContainer = ({ name }) => {
+  const { data, error, isLoading } = useSWR(
+    `/api/lesson?name=${name}`,
+    fetcher
+  );
+
+  return (
+    <>
+      <h1>Lesson about {name}</h1>
+
+      {!isLoading && !error && <ReactMarkdown>{data.contents}</ReactMarkdown>}
+    </>
+  );
+};
+
+export default LessonContainer;

lessons/expressions.md

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+# Expressions
+
+## Pattern Matching

lessons/functions.md

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+# Functions
+
+As you might've guessed, the foundations of functional programming are
+_functions_! Yes, exactly in the math sense. If high school math is getting a
+bit hazy for you, here's a recap:
+
+- Functions take a single input (or multiple inputs, but we'll get into this a
+  bit later!) and produce a single output
+
+  - f(1) = 2
+  - f(2) = 4
+  - f(3) = 6
+
+- Multiple inputs are allowed to produce a single output
+
+  - g(1) = 1
+  - g(2) = 1
+  - g(3) = 2
+
+- A single output cannot produce two different values!
+
+  - h(1) = 1
+  - h(2) = 2
+
+  This isn't a function. Think of functions as being this unchangeable binding
+  between one input and a certain output. If you evaluate the function again, it
+  should always produce that same output, so it doesn't make sense for a
+  function to simultaneously give two outputs for a single input. This property
+  is called function _purity_.
+
+  > There are also impure functions, which have _side effects_. For now, we will
+  > focus on pure functions.
+
+> Example questions:
+>
+> - Which of the following are functions? (give a few functions)
+
+## Functions can call other functions
+
+The output of a function is really just like any other expression that you could
+write. For example:
+
+- 1, 5+5, log(x) is a valid output. f(x) = 1, g(x) = 5+5, h(x) = log(x)
+- Any expression involving the input is valid. f(x) = 2 \* x
+- Calling the function again is valid! f(x) = f(x - 1)
+  - _There are a few restrictions to this. We'll see how this works later_
+
+In general, we can say that function calls are part of what we consider
+expressions. Since the right side of functions are also expressions, we can call
+functions inside functions!
+
+- See also: Expressions
+
+## Functions are first class
+
+In traditional arithmetic, we think of functions as rather _privileged_.
+Functions are these operations that we can _do_ to numbers, which are different
+from numbers.
+
+Well, not anymore. Functions themselves are also expressions now! We can talk
+about passing them around to other functions, but not much in the realm of
+arithmetic.
+
+- Venn diagram:
+  - Functions
+    - Can be called
+  - Both
+    - Can be passed around as variables
+  - Numbers
+    - Can be added / subtracted / multiplied / divided
+    - Can take square roots and compute lots of functions
+
+If you noticed, all we really added was this middle part. But this gives us a
+lot of power to use functions. Say you wanted to write a function called
+**repeat**. All it does is repeat a function several times. For example,
+
+- If I have f(x) = 2x, then repeat(f, 5) = f(f(f(f(f(x))))) = 32x
+- If I have g(x) = 3x - 1, then repeat(g, 2) = 3(3x - 1) - 1 = 9x - 4
+
+In this case, the function **repeat** is known as a _higher order function_. It
+takes a function as its parameter, and can freely call it or pass it around.
+There are a few very useful and popular higher order functions:
+
+- map
+- filter
+- fold
+
+## Recursion
+
+## Currying

lessons/other-topics.md

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+# Other Topics
+
+## Closures

lessons/state.md

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+# State
+
+## Monads

lessons/streams.md

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+# Streams
+
+## Laziness
+
+## Iterators

lessons/types.md

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+# Types
+
+## Strict Types
+
+## Primitive Types
+
+## Type Constructors
+
+### Option
+
+## Recursive Data Types
+
+### Lists
+
+### Trees
+
+## Abstraction

next.config.js

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+/** @type {import('next').NextConfig} */
+const nextConfig = {
+  reactStrictMode: true,
+}
+
+module.exports = nextConfig

package.json

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+{
+  "name": "fpcourse",
+  "version": "0.1.0",
+  "private": true,
+  "scripts": {
+    "dev": "next dev",
+    "build": "next build",
+    "start": "next start",
+    "lint": "next lint"
+  },
+  "dependencies": {
+    "@types/node": "18.15.11",
+    "@types/react": "18.0.35",
+    "@types/react-dom": "18.0.11",
+    "autoprefixer": "10.4.14",
+    "eslint": "8.38.0",
+    "eslint-config-next": "13.3.0",
+    "next": "13.3.0",
+    "postcss": "8.4.21",
+    "react": "18.2.0",
+    "react-dom": "18.2.0",
+    "react-markdown": "^8.0.7",
+    "tailwindcss": "3.3.1",
+    "typescript": "5.0.4"
+  },
+  "devDependencies": {
+    "swr": "^2.1.3"
+  }
+}

pages/_app.tsx

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+import '@/styles/globals.css'
+import type { AppProps } from 'next/app'
+
+export default function App({ Component, pageProps }: AppProps) {
+  return <Component {...pageProps} />
+}

pages/_document.tsx

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+import { Html, Head, Main, NextScript } from 'next/document'
+
+export default function Document() {
+  return (
+    <Html lang="en">
+      <Head />
+      <body>
+        <Main />
+        <NextScript />
+      </body>
+    </Html>
+  )
+}

pages/api/hello.ts

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+// Next.js API route support: https://nextjs.org/docs/api-routes/introduction
+import type { NextApiRequest, NextApiResponse } from 'next'
+
+type Data = {
+  name: string
+}
+
+export default function handler(
+  req: NextApiRequest,
+  res: NextApiResponse<Data>
+) {
+  res.status(200).json({ name: 'John Doe' })
+}

pages/api/lesson.ts

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+// Next.js API route support: https://nextjs.org/docs/api-routes/introduction
+import { readFile } from "fs/promises";
+import type { NextApiRequest, NextApiResponse } from "next";
+
+export default async function handler(
+  req: NextApiRequest,
+  res: NextApiResponse
+) {
+  const { name } = req.query;
+
+  const result = await readFile(`lessons/${name}.md`);
+  const resultString = result.toString();
+
+  res.status(200).json({ contents: resultString });
+}

pages/index.tsx

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+import dynamic from "next/dynamic";
+import { Inter } from "next/font/google";
+import { useState } from "react";
+
+export default function Home() {
+  const [showBanner, setShowBanner] = useState(true);
+  const [lessons, setLessons] = useState<Element[]>([]);
+
+  const loadLesson = (name: string) => {
+    setShowBanner(false);
+
+    const LessonContainer = dynamic(
+      () => import("../components/LessonContainer"),
+      { loading: () => <p>Loading...</p> }
+    );
+
+    setLessons([...lessons, <LessonContainer name={name} />]);
+  };
+
+  return (
+    <main>
+      <details
+        className="intro"
+        open={showBanner}
+      >
+        <summary>Intro</summary>
+        <p>
+          Functional programming is a structured way of thinking that gives us a
+          better understanding about how programs behave. Although it relies on
+          theoretical foundations, the things you will take away will help guide
+          your thinking no matter what paradigm!
+        </p>
+
+        <p>
+          Ready to start learning functional programming? Click one of the
+          buttons below to get started!
+        </p>
+
+        <button onClick={() => loadLesson("functions")}>
+          Get Started
+          <br />
+          <small>Functions &darr;</small>
+        </button>
+        <button onClick={() => loadLesson("types")}>
+          Get Started
+          <br />
+          <small>Types &darr;</small>
+        </button>
+        <button onClick={() => loadLesson("state")}>
+          Get Started
+          <br />
+          <small>State &darr;</small>
+        </button>
+      </details>
+
+      {lessons}
+    </main>
+  );
+}

postcss.config.js

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+module.exports = {
+  plugins: {
+    tailwindcss: {},
+    autoprefixer: {},
+  },
+}

public/next.svg

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+<svg xmlns="http://www.w3.org/2000/svg" fill="none" viewBox="0 0 394 80"><path fill="#000" d="M262 0h68.5v12.7h-27.2v66.6h-13.6V12.7H262V0ZM149 0v12.7H94v20.4h44.3v12.6H94v21h55v12.6H80.5V0h68.7zm34.3 0h-17.8l63.8 79.4h17.9l-32-39.7 32-39.6h-17.9l-23 28.6-23-28.6zm18.3 56.7-9-11-27.1 33.7h17.8l18.3-22.7z"/><path fill="#000" d="M81 79.3 17 0H0v79.3h13.6V17l50.2 62.3H81Zm252.6-.4c-1 0-1.8-.4-2.5-1s-1.1-1.6-1.1-2.6.3-1.8 1-2.5 1.6-1 2.6-1 1.8.3 2.5 1a3.4 3.4 0 0 1 .6 4.3 3.7 3.7 0 0 1-3 1.8zm23.2-33.5h6v23.3c0 2.1-.4 4-1.3 5.5a9.1 9.1 0 0 1-3.8 3.5c-1.6.8-3.5 1.3-5.7 1.3-2 0-3.7-.4-5.3-1s-2.8-1.8-3.7-3.2c-.9-1.3-1.4-3-1.4-5h6c.1.8.3 1.6.7 2.2s1 1.2 1.6 1.5c.7.4 1.5.5 2.4.5 1 0 1.8-.2 2.4-.6a4 4 0 0 0 1.6-1.8c.3-.8.5-1.8.5-3V45.5zm30.9 9.1a4.4 4.4 0 0 0-2-3.3 7.5 7.5 0 0 0-4.3-1.1c-1.3 0-2.4.2-3.3.5-.9.4-1.6 1-2 1.6a3.5 3.5 0 0 0-.3 4c.3.5.7.9 1.3 1.2l1.8 1 2 .5 3.2.8c1.3.3 2.5.7 3.7 1.2a13 13 0 0 1 3.2 1.8 8.1 8.1 0 0 1 3 6.5c0 2-.5 3.7-1.5 5.1a10 10 0 0 1-4.4 3.5c-1.8.8-4.1 1.2-6.8 1.2-2.6 0-4.9-.4-6.8-1.2-2-.8-3.4-2-4.5-3.5a10 10 0 0 1-1.7-5.6h6a5 5 0 0 0 3.5 4.6c1 .4 2.2.6 3.4.6 1.3 0 2.5-.2 3.5-.6 1-.4 1.8-1 2.4-1.7a4 4 0 0 0 .8-2.4c0-.9-.2-1.6-.7-2.2a11 11 0 0 0-2.1-1.4l-3.2-1-3.8-1c-2.8-.7-5-1.7-6.6-3.2a7.2 7.2 0 0 1-2.4-5.7 8 8 0 0 1 1.7-5 10 10 0 0 1 4.3-3.5c2-.8 4-1.2 6.4-1.2 2.3 0 4.4.4 6.2 1.2 1.8.8 3.2 2 4.3 3.4 1 1.4 1.5 3 1.5 5h-5.8z"/></svg>

public/vercel.svg

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+<svg xmlns="http://www.w3.org/2000/svg" fill="none" viewBox="0 0 283 64"><path fill="black" d="M141 16c-11 0-19 7-19 18s9 18 20 18c7 0 13-3 16-7l-7-5c-2 3-6 4-9 4-5 0-9-3-10-7h28v-3c0-11-8-18-19-18zm-9 15c1-4 4-7 9-7s8 3 9 7h-18zm117-15c-11 0-19 7-19 18s9 18 20 18c6 0 12-3 16-7l-8-5c-2 3-5 4-8 4-5 0-9-3-11-7h28l1-3c0-11-8-18-19-18zm-10 15c2-4 5-7 10-7s8 3 9 7h-19zm-39 3c0 6 4 10 10 10 4 0 7-2 9-5l8 5c-3 5-9 8-17 8-11 0-19-7-19-18s8-18 19-18c8 0 14 3 17 8l-8 5c-2-3-5-5-9-5-6 0-10 4-10 10zm83-29v46h-9V5h9zM37 0l37 64H0L37 0zm92 5-27 48L74 5h10l18 30 17-30h10zm59 12v10l-3-1c-6 0-10 4-10 10v15h-9V17h9v9c0-5 6-9 13-9z"/></svg>

styles/globals.css

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+body, html {
+  margin: 0;
+  padding: 0;
+}
+
+main {
+  width: 890px;
+  margin: auto;
+
+  font-family: sans-serif;
+}
+
+.intro {
+  background: white;
+  position: sticky;
+  top: 0;
+  z-index: 20p;
+  padding: 20px;
+  border-bottom: 1px solid lightgray;
+}

tailwind.config.js

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+/** @type {import('tailwindcss').Config} */
+module.exports = {
+  content: [
+    './pages/**/*.{js,ts,jsx,tsx}',
+    './components/**/*.{js,ts,jsx,tsx}',
+    './app/**/*.{js,ts,jsx,tsx}',
+  ],
+  theme: {
+    extend: {
+      backgroundImage: {
+        'gradient-radial': 'radial-gradient(var(--tw-gradient-stops))',
+        'gradient-conic':
+          'conic-gradient(from 180deg at 50% 50%, var(--tw-gradient-stops))',
+      },
+    },
+  },
+  plugins: [],
+}

tsconfig.json

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+{
+  "compilerOptions": {
+    "target": "es5",
+    "lib": ["dom", "dom.iterable", "esnext"],
+    "allowJs": true,
+    "skipLibCheck": true,
+    "strict": true,
+    "forceConsistentCasingInFileNames": true,
+    "noEmit": true,
+    "esModuleInterop": true,
+    "module": "esnext",
+    "moduleResolution": "node",
+    "resolveJsonModule": true,
+    "isolatedModules": true,
+    "jsx": "preserve",
+    "incremental": true,
+    "paths": {
+      "@/*": ["./*"]
+    }
+  },
+  "include": ["next-env.d.ts", "**/*.ts", "**/*.tsx"],
+  "exclude": ["node_modules"]
+}