lab 4

lectures/04/alist/Cargo.lock

@@ -0,0 +1,7 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 4
+
+[[package]]
+name = "alist"
+version = "0.1.0"

lectures/04/alist/Cargo.toml

@@ -0,0 +1,6 @@
+[package]
+name = "alist"
+version = "0.1.0"
+edition = "2024"
+
+[dependencies]

lectures/04/alist/src/main.rs

@@ -0,0 +1,42 @@
+// for demo purposes
+struct Alist<K, V>(Vec<(K, V)>); // newtype pattern
+
+impl<K, V> Alist<K, V> {
+    fn new() -> Self {
+        Self(Vec::new())
+    }
+
+    fn insert(&mut self, key: K, value: V) {
+        self.0.push((key, value));
+    }
+
+    fn len(&self) -> usize {
+        self.0.len()
+    }
+
+    fn into_iter(self) -> std::vec::IntoIter<(K, V)> {
+        self.0.into_iter()
+    }
+}
+
+use std::ops::Deref;
+
+impl<K, V> Deref for Alist<K, V> {
+    type Target = [(K, V)];
+
+    fn deref(&self) -> &Self::Target {
+        self.0.deref()
+    }
+}
+
+fn main() {
+    let mut l = Alist::new();
+    for (x, y) in [(1, 2), (3, 4), (5, 6)] {
+        l.insert(x, y);
+    }
+
+    let mut iter = l.iter();
+    while let Some((k, v)) = iter.next() {
+        println!("{k}: {v}");
+    }
+}

lectures/04/game_of_life/.gitignore

@@ -0,0 +1,6 @@
+/target
+**/*.rs.bk
+Cargo.lock
+bin/
+pkg/
+wasm-pack.log

lectures/04/game_of_life/Cargo.toml

@@ -0,0 +1,33 @@
+[package]
+name = "game_of_life"
+version = "0.1.0"
+authors = ["Braeden Sowinski <braeden@sowinski.dev>"]
+edition = "2018"
+
+[lib]
+crate-type = ["cdylib", "rlib"]
+
+[features]
+default = ["console_error_panic_hook"]
+
+[dependencies]
+wasm-bindgen = "0.2.84"
+
+# The `console_error_panic_hook` crate provides better debugging of panics by
+# logging them with `console.error`. This is great for development, but requires
+# all the `std::fmt` and `std::panicking` infrastructure, so isn't great for
+# code size when deploying.
+console_error_panic_hook = { version = "0.1.7", optional = true }
+
+[dev-dependencies]
+wasm-bindgen-test = "0.3.34"
+
+[profile.release]
+# Tell `rustc` to optimize for small code size.
+opt-level = "s"
+
+# The system `wasm-opt` (binaryen) here is too old to correctly handle the
+# externref tables wasm-bindgen generates, and corrupts the table's growth
+# limit, breaking initialization at runtime. Skip the wasm-opt pass.
+[package.metadata.wasm-pack.profile.release]
+wasm-opt = false

lectures/04/game_of_life/LICENSE-APACHE

@@ -0,0 +1,201 @@
+                              Apache License
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+
+TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION
+
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+   Contributor provides its Contributions) on an "AS IS" BASIS,
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+See the License for the specific language governing permissions and
+limitations under the License.

lectures/04/game_of_life/LICENSE-MIT

@@ -0,0 +1,25 @@
+Copyright (c) 2018 Braeden Sowinski <braeden@sowinski.dev>
+
+Permission is hereby granted, free of charge, to any
+person obtaining a copy of this software and associated
+documentation files (the "Software"), to deal in the
+Software without restriction, including without
+limitation the rights to use, copy, modify, merge,
+publish, distribute, sublicense, and/or sell copies of
+the Software, and to permit persons to whom the Software
+is furnished to do so, subject to the following
+conditions:
+
+The above copyright notice and this permission notice
+shall be included in all copies or substantial portions
+of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF
+ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED
+TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A
+PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT
+SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
+CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR
+IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+DEALINGS IN THE SOFTWARE.

lectures/04/game_of_life/README.md

@@ -0,0 +1,78 @@
+<div align="center">
+
+  <h1><code>wasm-pack-template</code></h1>
+
+  <strong>A template for kick starting a Rust and WebAssembly project using <a href="https://github.com/rustwasm/wasm-pack">wasm-pack</a>.</strong>
+
+  <h3>
+    <a href="https://rustwasm.github.io/docs/wasm-pack/tutorials/npm-browser-packages/index.html">Tutorial</a>
+    <span> | </span>
+    <a href="https://discordapp.com/channels/442252698964721669/443151097398296587">Chat</a>
+  </h3>
+
+  <sub>Built with Rust and WebAssembly by <a href="https://rustwasm.github.io/">The Rust and WebAssembly Working Group</a></sub>
+</div>
+
+## About
+
+[Read this template tutorial][template-docs].
+
+This template is designed for compiling Rust libraries into WebAssembly and
+publishing the resulting package to NPM.
+
+Be sure to check out [other `wasm-pack` tutorials online][tutorials] for other
+templates and usages of `wasm-pack`.
+
+[tutorials]: https://rustwasm.github.io/docs/wasm-pack/tutorials/index.html
+[template-docs]: https://rustwasm.github.io/docs/wasm-pack/tutorials/npm-browser-packages/index.html
+
+## Usage
+
+### Use `wasm-pack new` to Clone this Template
+
+```
+wasm-pack new my-project
+cd my-project
+```
+
+### Build with `wasm-pack build`
+
+```
+wasm-pack build
+```
+
+### Test in Headless Browsers with `wasm-pack test`
+
+```
+wasm-pack test --headless --firefox
+```
+
+### Publish to NPM with `wasm-pack publish`
+
+```
+wasm-pack publish
+```
+
+## Batteries Included
+
+* [`wasm-bindgen`](https://github.com/rustwasm/wasm-bindgen) for communicating
+  between WebAssembly and JavaScript.
+* [`console_error_panic_hook`](https://github.com/rustwasm/console_error_panic_hook)
+  for logging panic messages to the developer console.
+* `LICENSE-APACHE` and `LICENSE-MIT`: most Rust projects are licensed this way, so these are included for you.
+
+## License
+
+Licensed under either of
+
+* Apache License, Version 2.0, ([LICENSE-APACHE](LICENSE-APACHE) or http://www.apache.org/licenses/LICENSE-2.0)
+* MIT license ([LICENSE-MIT](LICENSE-MIT) or http://opensource.org/licenses/MIT)
+
+at your option.
+
+### Contribution
+
+Unless you explicitly state otherwise, any contribution intentionally
+submitted for inclusion in the work by you, as defined in the Apache-2.0
+license, shall be dual licensed as above, without any additional terms or
+conditions.

lectures/04/game_of_life/index.html

@@ -0,0 +1,28 @@
+<!DOCTYPE html>
+<html>
+	<head>
+		<meta charset="utf-8">
+		<title>Game of Life</title>
+		<style>
+			body {
+				display: flex;
+				flex-direction: column;
+				align-items: center;
+			}
+
+			button {
+				font-size: 1.5rem;
+				padding: 0.25rem 1rem;
+				margin: 1rem 0.5rem;
+			}
+		</style>
+	</head>
+	<body>
+		<div>
+			<button id="play-pause"></button>
+			<button id="clear">Clear</button>
+		</div>
+		<canvas id="game-of-life-canvas"></canvas>
+		<script type="module" src="./index.js"></script>
+	</body>
+</html>

lectures/04/game_of_life/index.js

@@ -0,0 +1,200 @@
+import init, { Cell, Universe } from "./pkg/game_of_life.js";
+
+const CELL_SIZE = 10; // px
+const GRID_COLOR = "#CCCCCC";
+const DEAD_COLOR = "#FFFFFF";
+const ALIVE_COLOR = "#000000";
+
+const { memory } = await init();
+
+const universe = Universe.new();
+const width = universe.width();
+const height = universe.height();
+
+const canvas = document.getElementById("game-of-life-canvas");
+canvas.height = (CELL_SIZE + 1) * height + 1;
+canvas.width = (CELL_SIZE + 1) * width + 1;
+
+const ctx = canvas.getContext("2d");
+
+const getIndex = (row, column) => row * width + column;
+
+const drawGrid = () => {
+	ctx.beginPath();
+	ctx.strokeStyle = GRID_COLOR;
+
+	for (let i = 0; i <= width; i++) {
+		ctx.moveTo(i * (CELL_SIZE + 1) + 1, 0);
+		ctx.lineTo(i * (CELL_SIZE + 1) + 1, (CELL_SIZE + 1) * height + 1);
+	}
+
+	for (let j = 0; j <= height; j++) {
+		ctx.moveTo(0, j * (CELL_SIZE + 1) + 1);
+		ctx.lineTo((CELL_SIZE + 1) * width + 1, j * (CELL_SIZE + 1) + 1);
+	}
+
+	ctx.stroke();
+};
+
+const drawCells = () => {
+	const cellsPtr = universe.cells();
+	const cells = new Uint8Array(memory.buffer, cellsPtr, width * height);
+
+	ctx.beginPath();
+
+	for (let row = 0; row < height; row++) {
+		for (let col = 0; col < width; col++) {
+			const idx = getIndex(row, col);
+
+			ctx.fillStyle = cells[idx] === Cell.Dead ? DEAD_COLOR : ALIVE_COLOR;
+
+			ctx.fillRect(
+				col * (CELL_SIZE + 1) + 1,
+				row * (CELL_SIZE + 1) + 1,
+				CELL_SIZE,
+				CELL_SIZE,
+			);
+		}
+	}
+
+	ctx.stroke();
+};
+
+let animationId = null;
+
+const isPaused = () => animationId === null;
+
+const renderLoop = () => {
+	universe.tick();
+
+	drawGrid();
+	drawCells();
+
+	animationId = requestAnimationFrame(renderLoop);
+};
+
+const playPauseButton = document.getElementById("play-pause");
+
+const play = () => {
+	playPauseButton.textContent = "⏸";
+	renderLoop();
+};
+
+const pause = () => {
+	playPauseButton.textContent = "▶";
+	cancelAnimationFrame(animationId);
+	animationId = null;
+};
+
+playPauseButton.addEventListener("click", () => {
+	if (isPaused()) {
+		play();
+	} else {
+		pause();
+	}
+});
+
+const clearButton = document.getElementById("clear");
+
+clearButton.addEventListener("click", () => {
+	universe.clear();
+
+	drawGrid();
+	drawCells();
+});
+
+const cellAtEvent = (event) => {
+	const boundingRect = canvas.getBoundingClientRect();
+
+	const scaleX = canvas.width / boundingRect.width;
+	const scaleY = canvas.height / boundingRect.height;
+
+	const canvasLeft = (event.clientX - boundingRect.left) * scaleX;
+	const canvasTop = (event.clientY - boundingRect.top) * scaleY;
+
+	const row = Math.min(Math.floor(canvasTop / (CELL_SIZE + 1)), height - 1);
+	const col = Math.min(Math.floor(canvasLeft / (CELL_SIZE + 1)), width - 1);
+
+	return [row, col];
+};
+
+// Bresenham's line algorithm, so fast drags don't leave gaps between cells.
+const forEachCellOnLine = (row0, col0, row1, col1, callback) => {
+	let row = row0;
+	let col = col0;
+
+	const dRow = Math.abs(row1 - row0);
+	const dCol = Math.abs(col1 - col0);
+	const stepRow = row1 > row0 ? 1 : -1;
+	const stepCol = col1 > col0 ? 1 : -1;
+
+	let err = dRow - dCol;
+
+	while (true) {
+		callback(row, col);
+
+		if (row === row1 && col === col1) {
+			break;
+		}
+
+		const err2 = err * 2;
+
+		if (err2 > -dCol) {
+			err -= dCol;
+			row += stepRow;
+		}
+
+		if (err2 < dRow) {
+			err += dRow;
+			col += stepCol;
+		}
+	}
+};
+
+let isDrawing = false;
+let lastCell = null;
+
+canvas.addEventListener("mousedown", (event) => {
+	const [row, col] = cellAtEvent(event);
+
+	isDrawing = true;
+	lastCell = [row, col];
+
+	universe.toggle_cell(row, col);
+
+	drawGrid();
+	drawCells();
+});
+
+canvas.addEventListener("mousemove", (event) => {
+	if (!isDrawing) {
+		return;
+	}
+
+	const [row, col] = cellAtEvent(event);
+
+	if (row === lastCell[0] && col === lastCell[1]) {
+		return;
+	}
+
+	forEachCellOnLine(lastCell[0], lastCell[1], row, col, (r, c) => {
+		universe.set_alive(r, c);
+	});
+
+	lastCell = [row, col];
+
+	drawGrid();
+	drawCells();
+});
+
+const stopDrawing = () => {
+	isDrawing = false;
+	lastCell = null;
+};
+
+window.addEventListener("mouseup", stopDrawing);
+canvas.addEventListener("mouseleave", stopDrawing);
+
+drawGrid();
+drawCells();
+play();

lectures/04/game_of_life/src/lib.rs

@@ -0,0 +1,132 @@
+use wasm_bindgen::prelude::*;
+
+#[wasm_bindgen]
+#[derive(Clone, Copy, PartialEq, Eq)]
+#[repr(u8)]
+pub enum Cell {
+    Dead = 0,
+    Alive = 1,
+}
+
+impl Cell {
+    pub fn toggle(&mut self) {
+        *self = if *self == Cell::Alive {
+            Cell::Dead
+        } else {
+            Cell::Alive
+        };
+    }
+}
+
+#[wasm_bindgen]
+pub struct Universe {
+    width: u32,
+    height: u32,
+    cells: Vec<Cell>,
+}
+
+#[wasm_bindgen]
+impl Universe {
+    pub fn new() -> Self {
+        let (width, height) = (64, 64);
+        let cells = (0..width * height)
+            .map(|i| {
+                if i % 2 == 0 || i % 7 == 0 {
+                    Cell::Alive
+                } else {
+                    Cell::Dead
+                }
+            })
+            .collect();
+
+        Self {
+            width,
+            height,
+            cells,
+        }
+    }
+
+    pub fn width(&self) -> u32 {
+        self.width
+    }
+
+    pub fn height(&self) -> u32 {
+        self.height
+    }
+
+    pub fn cells(&self) -> *const Cell {
+        self.cells.as_ptr()
+    }
+
+    fn get_index(&self, row: u32, col: u32) -> usize {
+        (row * self.width + col) as usize
+    }
+
+    fn count_live_neighbours(&self, row: u32, col: u32) -> u8 {
+        let mut count = 0;
+        for i in [self.height - 1, 0, 1] {
+            for j in [self.width - 1, 0, 1] {
+                if i == 0 && j == 0 {
+                    continue;
+                }
+                let idx = self.get_index((row + i) % self.height, (col + j) % self.width);
+                count += self.cells[idx] as u8;
+            }
+        }
+        count
+    }
+
+    pub fn tick(&mut self) {
+        let mut cells = self.cells.clone();
+        for row in 0..self.height {
+            for col in 0..self.width {
+                let idx = self.get_index(row, col);
+                cells[idx] = match (self.cells[idx], self.count_live_neighbours(row, col)) {
+                    (_, 3) | (Cell::Alive, 2) => Cell::Alive,
+                    _ => Cell::Dead,
+                }
+            }
+        }
+        self.cells = cells;
+    }
+
+    pub fn render(&self) -> String {
+        self.to_string()
+    }
+
+    pub fn toggle_cell(&mut self, row: u32, col: u32) {
+        let idx = self.get_index(row, col);
+        self.cells[idx].toggle();
+    }
+
+    pub fn set_alive(&mut self, row: u32, col: u32) {
+        let idx = self.get_index(row, col);
+        self.cells[idx] = Cell::Alive;
+    }
+
+    pub fn clear(&mut self) {
+        for cell in self.cells.iter_mut() {
+            *cell = Cell::Dead;
+        }
+    }
+}
+
+use std::fmt;
+
+impl fmt::Display for Universe {
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        for row in 0..self.height {
+            for col in 0..self.width {
+                let idx = self.get_index(row, col);
+                let glyph = if self.cells[idx] == Cell::Alive {
+                    '⬛'
+                } else {
+                    '🔳'
+                };
+                write!(f, "{glyph}");
+            }
+            write!(f, "\n");
+        }
+        Ok(())
+    }
+}

lectures/04/game_of_life/tests/web.rs

@@ -0,0 +1,13 @@
+//! Test suite for the Web and headless browsers.
+
+#![cfg(target_arch = "wasm32")]
+
+extern crate wasm_bindgen_test;
+use wasm_bindgen_test::*;
+
+wasm_bindgen_test_configure!(run_in_browser);
+
+#[wasm_bindgen_test]
+fn pass() {
+    assert_eq!(1 + 1, 2);
+}

lectures/04/hello/.gitignore

@@ -0,0 +1,6 @@
+/target
+**/*.rs.bk
+Cargo.lock
+bin/
+pkg/
+wasm-pack.log

lectures/04/hello/Cargo.toml

@@ -0,0 +1,27 @@
+[package]
+name = "hello"
+version = "0.1.0"
+authors = ["Braeden Sowinski <braeden@sowinski.dev>"]
+edition = "2018"
+
+[lib]
+crate-type = ["cdylib", "rlib"]
+
+[features]
+default = ["console_error_panic_hook"]
+
+[dependencies]
+wasm-bindgen = "0.2.84"
+
+# The `console_error_panic_hook` crate provides better debugging of panics by
+# logging them with `console.error`. This is great for development, but requires
+# all the `std::fmt` and `std::panicking` infrastructure, so isn't great for
+# code size when deploying.
+console_error_panic_hook = { version = "0.1.7", optional = true }
+
+[dev-dependencies]
+wasm-bindgen-test = "0.3.34"
+
+[profile.release]
+# Tell `rustc` to optimize for small code size.
+opt-level = "s"

lectures/04/hello/LICENSE-APACHE

@@ -0,0 +1,201 @@
+                              Apache License
+                        Version 2.0, January 2004
+                     http://www.apache.org/licenses/
+
+TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION
+
+1. Definitions.
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+
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+
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+   the conditions stated in this License.
+
+5. Submission of Contributions. Unless You explicitly state otherwise,
+   any Contribution intentionally submitted for inclusion in the Work
+   by You to the Licensor shall be under the terms and conditions of
+   this License, without any additional terms or conditions.
+   Notwithstanding the above, nothing herein shall supersede or modify
+   the terms of any separate license agreement you may have executed
+   with Licensor regarding such Contributions.
+
+6. Trademarks. This License does not grant permission to use the trade
+   names, trademarks, service marks, or product names of the Licensor,
+   except as required for reasonable and customary use in describing the
+   origin of the Work and reproducing the content of the NOTICE file.
+
+7. Disclaimer of Warranty. Unless required by applicable law or
+   agreed to in writing, Licensor provides the Work (and each
+   Contributor provides its Contributions) on an "AS IS" BASIS,
+   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
+   implied, including, without limitation, any warranties or conditions
+   of TITLE, NON-INFRINGEMENT, MERCHANTABILITY, or FITNESS FOR A
+   PARTICULAR PURPOSE. You are solely responsible for determining the
+   appropriateness of using or redistributing the Work and assume any
+   risks associated with Your exercise of permissions under this License.
+
+8. Limitation of Liability. In no event and under no legal theory,
+   whether in tort (including negligence), contract, or otherwise,
+   unless required by applicable law (such as deliberate and grossly
+   negligent acts) or agreed to in writing, shall any Contributor be
+   liable to You for damages, including any direct, indirect, special,
+   incidental, or consequential damages of any character arising as a
+   result of this License or out of the use or inability to use the
+   Work (including but not limited to damages for loss of goodwill,
+   work stoppage, computer failure or malfunction, or any and all
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+
+9. Accepting Warranty or Additional Liability. While redistributing
+   the Work or Derivative Works thereof, You may choose to offer,
+   and charge a fee for, acceptance of support, warranty, indemnity,
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+   License. However, in accepting such obligations, You may act only
+   on Your own behalf and on Your sole responsibility, not on behalf
+   of any other Contributor, and only if You agree to indemnify,
+   defend, and hold each Contributor harmless for any liability
+   incurred by, or claims asserted against, such Contributor by reason
+   of your accepting any such warranty or additional liability.
+
+END OF TERMS AND CONDITIONS
+
+APPENDIX: How to apply the Apache License to your work.
+
+   To apply the Apache License to your work, attach the following
+   boilerplate notice, with the fields enclosed by brackets "[]"
+   replaced with your own identifying information. (Don't include
+   the brackets!)  The text should be enclosed in the appropriate
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+   file or class name and description of purpose be included on the
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+
+Copyright [yyyy] [name of copyright owner]
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.

lectures/04/hello/LICENSE-MIT

@@ -0,0 +1,25 @@
+Copyright (c) 2018 Braeden Sowinski <braeden@sowinski.dev>
+
+Permission is hereby granted, free of charge, to any
+person obtaining a copy of this software and associated
+documentation files (the "Software"), to deal in the
+Software without restriction, including without
+limitation the rights to use, copy, modify, merge,
+publish, distribute, sublicense, and/or sell copies of
+the Software, and to permit persons to whom the Software
+is furnished to do so, subject to the following
+conditions:
+
+The above copyright notice and this permission notice
+shall be included in all copies or substantial portions
+of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF
+ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED
+TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A
+PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT
+SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
+CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR
+IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+DEALINGS IN THE SOFTWARE.

lectures/04/hello/README.md

@@ -0,0 +1,78 @@
+<div align="center">
+
+  <h1><code>wasm-pack-template</code></h1>
+
+  <strong>A template for kick starting a Rust and WebAssembly project using <a href="https://github.com/rustwasm/wasm-pack">wasm-pack</a>.</strong>
+
+  <h3>
+    <a href="https://rustwasm.github.io/docs/wasm-pack/tutorials/npm-browser-packages/index.html">Tutorial</a>
+    <span> | </span>
+    <a href="https://discordapp.com/channels/442252698964721669/443151097398296587">Chat</a>
+  </h3>
+
+  <sub>Built with Rust and WebAssembly by <a href="https://rustwasm.github.io/">The Rust and WebAssembly Working Group</a></sub>
+</div>
+
+## About
+
+[Read this template tutorial][template-docs].
+
+This template is designed for compiling Rust libraries into WebAssembly and
+publishing the resulting package to NPM.
+
+Be sure to check out [other `wasm-pack` tutorials online][tutorials] for other
+templates and usages of `wasm-pack`.
+
+[tutorials]: https://rustwasm.github.io/docs/wasm-pack/tutorials/index.html
+[template-docs]: https://rustwasm.github.io/docs/wasm-pack/tutorials/npm-browser-packages/index.html
+
+## Usage
+
+### Use `wasm-pack new` to Clone this Template
+
+```
+wasm-pack new my-project
+cd my-project
+```
+
+### Build with `wasm-pack build`
+
+```
+wasm-pack build
+```
+
+### Test in Headless Browsers with `wasm-pack test`
+
+```
+wasm-pack test --headless --firefox
+```
+
+### Publish to NPM with `wasm-pack publish`
+
+```
+wasm-pack publish
+```
+
+## Batteries Included
+
+* [`wasm-bindgen`](https://github.com/rustwasm/wasm-bindgen) for communicating
+  between WebAssembly and JavaScript.
+* [`console_error_panic_hook`](https://github.com/rustwasm/console_error_panic_hook)
+  for logging panic messages to the developer console.
+* `LICENSE-APACHE` and `LICENSE-MIT`: most Rust projects are licensed this way, so these are included for you.
+
+## License
+
+Licensed under either of
+
+* Apache License, Version 2.0, ([LICENSE-APACHE](LICENSE-APACHE) or http://www.apache.org/licenses/LICENSE-2.0)
+* MIT license ([LICENSE-MIT](LICENSE-MIT) or http://opensource.org/licenses/MIT)
+
+at your option.
+
+### Contribution
+
+Unless you explicitly state otherwise, any contribution intentionally
+submitted for inclusion in the work by you, as defined in the Apache-2.0
+license, shall be dual licensed as above, without any additional terms or
+conditions.

lectures/04/hello/index.html

@@ -0,0 +1,15 @@
+<!DOCTYPE html>
+<html>
+	<head>
+		<meta charset="utf-8">
+		<title>Hello</title>
+	</head>
+	<body>
+		<script type="module">
+			import init, {greet} from "./pkg/hello.js";
+			init().then(() => {
+				greet("world");
+			});
+		</script>
+	</body>
+</html>

lectures/04/hello/src/lib.rs

@@ -0,0 +1,13 @@
+mod utils;
+
+use wasm_bindgen::prelude::*;
+
+#[wasm_bindgen]
+extern "C" {
+    fn alert(s: &str);
+}
+
+#[wasm_bindgen]
+pub fn greet(s: &str) {
+    alert(&format!("Hello, {s}!"));
+}

lectures/04/hello/src/utils.rs

@@ -0,0 +1,10 @@
+pub fn set_panic_hook() {
+    // When the `console_error_panic_hook` feature is enabled, we can call the
+    // `set_panic_hook` function at least once during initialization, and then
+    // we will get better error messages if our code ever panics.
+    //
+    // For more details see
+    // https://github.com/rustwasm/console_error_panic_hook#readme
+    #[cfg(feature = "console_error_panic_hook")]
+    console_error_panic_hook::set_once();
+}

lectures/04/hello/tests/web.rs

@@ -0,0 +1,13 @@
+//! Test suite for the Web and headless browsers.
+
+#![cfg(target_arch = "wasm32")]
+
+extern crate wasm_bindgen_test;
+use wasm_bindgen_test::*;
+
+wasm_bindgen_test_configure!(run_in_browser);
+
+#[wasm_bindgen_test]
+fn pass() {
+    assert_eq!(1 + 1, 2);
+}