Here is the pasted-in (markdown) ChatGPT session that helped me create a basic React app.
Hypothesis: I can learn React/JS more easily by looking at JavaScript code than by buying a book on it.
You absolutely can—if you set it up right.
Given your background (C/C++/Swift/Kotlin/etc.), a “code-first” path will probably beat yet another 400-page book, as long as you don’t just skim and vibe. The traps are:
Here’s how to make your hypothesis work in a disciplined way:
Skim targeted references, then learn by reading/running tiny files.
Focus only on the JS that actually matters for React:
let / const vs varthis...)import / export)== vs ===async–awaitHow to do it code-first:
Take each concept and:
That beats a book.
Don’t start from a giant boilerplate or someone’s “enterprise starter.”
Pick a single-page toy app and treat it like a readable score:
Walk through:
useStateuseEffect (with and without deps)keyFor each feature, ask:
“If this were SwiftUI/Compose, what is the analogue?”
That mapping will accelerate you like crazy.
When reading sample code:
useEffect(() => {...}, []) — stop and reason exactly why the empty array matters.onClick={() => doThing(id)}, ensure you know why we’re passing a function instead of calling it directly.useThing) or HOCs, trace one fully until it’s not mysterious.If a snippet uses a toolchain thing (Vite, Next, Babel, ESLint), mentally box it as “infrastructure,” don’t let it blur with React/JS fundamentals.
You’ll learn fastest by building tools that you would actually use, e.g.:
Rules:
Your code-first plan can fail if:
You don’t need a full textbook, but a short curated guide or official docs pass is worth it to anchor terminology and idioms. Think: “1–2 evenings, not a semester.”
If you’re up for that, I’ll just lay it out directly next message.
If I put an index.html file in an S3 bucket and make it publicly readable, will it be automatically able to run with full React/JS functionality just by visiting its URL?
Thought for 25s
Short answer: yes, but only if your React/JS is fully client-side and correctly bundled+linked. S3 just serves files; the browser does all the work.
Here’s the practical version:
index.html.js bundles.css, images, etc.index.html will run full React/JS if:
<script> tags that point to:
main.js, bundle.js, etc.) that you also uploaded to the same bucket.index.html → Content-Type: text/html.js → Content-Type: application/javascript (or text/javascript)https://s3.amazonaws.com/your-bucket/index.html/about, /maze/123 etc.), enable Static website hosting (or use CloudFront) so all routes map to index.html. Otherwise deep links 404.npm start dev server behavior.index.html still assume localhost or the wrong base URL.If you’d like, I can sketch a minimal index.html + bundle layout that you can drop into S3 to confirm “yep, full React, no extra AWS magic.”
Sure
Thought for 13s
Here’s a minimal, S3-friendly React setup you can drop in and hit in the browser—no Node on the server, no AWS magic.
I’ll show you two variants:
Directory structure:
my-react-test/
index.html
app.js
index.html
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8" />
<title>Muvicado React Test</title>
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
</head>
<body>
<div id="root"></div>
<!-- React & ReactDOM from CDN (UMD builds) -->
<script src="https://unpkg.com/react@18/umd/react.development.js" crossorigin></script>
<script src="https://unpkg.com/react-dom@18/umd/react-dom.development.js" crossorigin></script>
<!-- Your app code -->
<script src="app.js"></script>
</body>
</html>
app.js
const { useState } = React;
function App() {
const [count, setCount] = useState(0);
return React.createElement(
'div',
{ style: { fontFamily: 'system-ui', padding: '2rem' } },
React.createElement('h1', null, 'Hello from S3 + React'),
React.createElement(
'button',
{ onClick: () => setCount(count + 1) },
`Clicked ${count} time${count === 1 ? '' : 's'}`
)
);
}
const root = ReactDOM.createRoot(document.getElementById('root'));
root.render(React.createElement(App));
index.html and app.js.index.html → text/htmlapp.js → application/javascriptindex.html, orThat’s it. You’ll get a fully functional React app running purely client-side.
When you use a bundler (which you should for anything serious), your upload target is the build output, not your source.
Example final layout (after npm run build):
dist/ # or build/
index.html
assets/
main-abcd1234.js
main-abcd1234.css
vendor-efgh5678.js
Deployment rules are the same:
dist/ to S3.index.html as the index document in Static website hosting.index.html references /assets/main-abcd1234.js etc. with paths that still make sense when hosted on S3.Then hitting the S3 website endpoint (or CloudFront in front of it) gives you:
If you’d like next, I can:
You read my mind. Do a tiny maze/hex-grid viewer.
Thought for 33s
Here we go: a tiny, S3-ready React hex-maze viewer. Pure static files, no build step, just drop into your bucket and hit the URL.
It:
index.html
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8" />
<title>Hex Maze Viewer - S3 React Test</title>
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<style>
body {
margin: 0;
font-family: system-ui, -apple-system, BlinkMacSystemFont, sans-serif;
background: #0f172a;
color: #e5e7eb;
display: flex;
flex-direction: column;
align-items: center;
justify-content: flex-start;
min-height: 100vh;
padding: 1.5rem;
}
h1 {
font-size: 1.4rem;
margin: 0 0 0.25rem;
}
p {
margin: 0 0 0.75rem;
font-size: 0.9rem;
color: #9ca3af;
}
#root {
margin-top: 0.5rem;
}
</style>
</head>
<body>
<h1>Hex Maze Viewer</h1>
<p>Static S3 hosting · Pure client-side React · Highlighted path in a 19-hex grid.</p>
<div id="root"></div>
<!-- React 18 UMD builds from CDN -->
<script src="https://unpkg.com/react@18/umd/react.development.js" crossorigin></script>
<script src="https://unpkg.com/react-dom@18/umd/react-dom.development.js" crossorigin></script>
<!-- Your app code -->
<script src="app.js"></script>
</body>
</html>
app.js
// Tiny Hex Maze Viewer
// All client-side: safe to host as static files in S3.
// Hex grid config
const HEX_SIZE = 26; // radius in pixels
const GRID_RADIUS = 2; // hex radius (1 + 6 + 12 = 19 cells)
// Convert axial coords (q, r) to pixel coords (pointy-top layout)
function axialToPixel(q, r, size) {
const x = size * (Math.sqrt(3) * q + Math.sqrt(3) / 2 * r);
const y = size * (3 / 2 * r);
return { x, y };
}
// Build polygon string for an SVG <polygon>
function hexPoints(x, y, size) {
const points = [];
for (let i = 0; i < 6; i++) {
const angle = Math.PI / 180 * (60 * i - 30); // pointy-top
const px = x + size * Math.cos(angle);
const py = y + size * Math.sin(angle);
points.push(`${px},${py}`);
}
return points.join(" ");
}
// Generate axial coordinates for a hexagon of radius GRID_RADIUS
function generateHexGrid(radius) {
const cells = [];
for (let q = -radius; q <= radius; q++) {
const r1 = Math.max(-radius, -q - radius);
const r2 = Math.min(radius, -q + radius);
for (let r = r1; r <= r2; r++) {
cells.push({ q, r });
}
}
return cells;
}
// A tiny "maze path": hard-coded list of axial coords
// (In a real app you'd generate this.)
const pathCoords = [
{ q: 0, r: 0 },
{ q: 1, r: -1 },
{ q: 2, r: -1 },
{ q: 2, r: 0 },
{ q: 1, r: 1 },
{ q: 0, r: 2 }
];
const pathKey = new Set(pathCoords.map(c => `${c.q},${c.r}`));
function HexMazeViewer() {
const cells = React.useMemo(
() => generateHexGrid(GRID_RADIUS),
[]
);
// Compute positions and bounds
const positioned = cells.map(c => {
const { x, y } = axialToPixel(c.q, c.r, HEX_SIZE);
return { ...c, x, y };
});
const xs = positioned.map(c => c.x);
const ys = positioned.map(c => c.y);
const minX = Math.min(...xs) - HEX_SIZE * 1.5;
const maxX = Math.max(...xs) + HEX_SIZE * 1.5;
const minY = Math.min(...ys) - HEX_SIZE * 1.5;
const maxY = Math.max(...ys) + HEX_SIZE * 1.5;
const width = maxX - minX;
const height = maxY - minY;
return React.createElement(
"svg",
{
width: 420,
height: 360,
viewBox: `${minX} ${minY} ${width} ${height}`,
style: {
background: "#020817",
borderRadius: "12px",
boxShadow: "0 18px 45px rgba(0,0,0,0.55)"
}
},
// Draw each hex cell
positioned.map((cell, i) => {
const isPath = pathKey.has(`${cell.q},${cell.r}`);
const baseFill = isPath ? "#22c55e" : "#111827";
const stroke = isPath ? "#bbf7d0" : "#4b5563";
const opacity = isPath ? 1 : 0.92;
return React.createElement(
"g",
{ key: i },
React.createElement("polygon", {
points: hexPoints(cell.x, cell.y, HEX_SIZE - 1.5),
fill: baseFill,
stroke: stroke,
"stroke-width": isPath ? 2 : 1,
opacity,
}),
React.createElement(
"text",
{
x: cell.x,
y: cell.y + 4,
"text-anchor": "middle",
"font-size": 9,
fill: isPath ? "#0f172a" : "#9ca3af",
},
`${cell.q},${cell.r}`
)
);
})
);
}
// Mount React 18 app
const rootEl = document.getElementById("root");
const root = ReactDOM.createRoot(rootEl);
root.render(React.createElement(HexMazeViewer));
index.htmlapp.jsindex.htmlNo build tooling, no Node, just: S3 serves files → browser runs React → you get a live hex/maze viewer.
If you’d like next, I can evolve this same snippet into:
Write a shell script to upload the two files from my ./dist directory to the S3 bucket, including creating the bucket, setting it as publicly readable, setting the index document and showing thr URL to run it, prompting “Do you want to visit this URL?”.
Here’s a single self-contained script that:
./dist/index.html and ./dist/app.js existindex.htmlSave as deploy_hex_website.sh (or whatever), chmod +x deploy_hex_website.sh, then run.
#!/usr/bin/env bash
set -euo pipefail
### Config / input ###
DIST_DIR="./dist"
if [[ ! -f "$DIST_DIR/index.html" || ! -f "$DIST_DIR/app.js" ]]; then
echo "Error: $DIST_DIR must contain index.html and app.js"
exit 1
fi
# Get bucket name
if [[ $# -ge 1 ]]; then
BUCKET_NAME="$1"
else
read -rp "Enter S3 bucket name to create/use (must be globally unique): " BUCKET_NAME
fi
if [[ -z "${BUCKET_NAME}" ]]; then
echo "Error: Bucket name cannot be empty."
exit 1
fi
# Get region (from AWS config if possible)
AWS_REGION="${AWS_REGION:-$(aws configure get region || true)}"
if [[ -z "${AWS_REGION}" ]]; then
read -rp "Enter AWS region for the bucket (e.g. us-east-1): " AWS_REGION
fi
if [[ -z "${AWS_REGION}" ]]; then
echo "Error: AWS region is required."
exit 1
fi
echo "Using bucket: $BUCKET_NAME"
echo "Using region: $AWS_REGION"
echo
### 1. Create bucket if it does not exist ###
echo "Checking if bucket exists..."
if aws s3api head-bucket --bucket "$BUCKET_NAME" 2>/dev/null; then
echo "Bucket already exists. Using existing bucket."
else
echo "Creating bucket..."
if [[ "$AWS_REGION" == "us-east-1" ]]; then
aws s3api create-bucket --bucket "$BUCKET_NAME"
else
aws s3api create-bucket \
--bucket "$BUCKET_NAME" \
--create-bucket-configuration LocationConstraint="$AWS_REGION"
fi
echo "Bucket created."
fi
### 2. Allow public access (bucket-level) ###
echo "Configuring public access settings..."
aws s3api put-public-access-block \
--bucket "$BUCKET_NAME" \
--public-access-block-configuration \
"BlockPublicAcls=false,IgnorePublicAcls=false,BlockPublicPolicy=false,RestrictPublicBuckets=false"
### 3. Attach bucket policy for public read ###
echo "Applying public read bucket policy..."
POLICY_JSON=$(cat <<EOF
{
"Version": "2012-10-17",
"Statement": [
{
"Sid": "PublicReadGetObject",
"Effect": "Allow",
"Principal": "*",
"Action": "s3:GetObject",
"Resource": "arn:aws:s3:::${BUCKET_NAME}/*"
}
]
}
EOF
)
aws s3api put-bucket-policy \
--bucket "$BUCKET_NAME" \
--policy "$POLICY_JSON"
### 4. Enable static website hosting ###
echo "Enabling static website hosting..."
aws s3 website "s3://${BUCKET_NAME}/" \
--index-document index.html \
--error-document index.html
### 5. Upload files with proper content types ###
echo "Uploading index.html..."
aws s3 cp "${DIST_DIR}/index.html" "s3://${BUCKET_NAME}/index.html" \
--content-type "text/html" \
--acl public-read
echo "Uploading app.js..."
aws s3 cp "${DIST_DIR}/app.js" "s3://${BUCKET_NAME}/app.js" \
--content-type "application/javascript" \
--acl public-read
### 6. Compute website URL ###
WEBSITE_URL="http://${BUCKET_NAME}.s3-website-${AWS_REGION}.amazonaws.com"
# Special case: some partitions/regions differ, but this works for standard aws partition.
echo
echo "Deployment complete."
echo "Your Hex Maze Viewer should be available at:"
echo " ${WEBSITE_URL}"
echo
### 7. Prompt to visit URL ###
read -rp "Do you want to visit this URL? (y/N): " OPEN_CHOICE
OPEN_CHOICE=${OPEN_CHOICE:-n}
if [[ "$OPEN_CHOICE" =~ ^[Yy]$ ]]; then
if command -v open >/dev/null 2>&1; then
open "${WEBSITE_URL}" # macOS
elif command -v xdg-open >/dev/null 2>&1; then
xdg-open "${WEBSITE_URL}" # Linux
else
echo "Please open this URL in your browser:"
echo "${WEBSITE_URL}"
fi
fi
If you’d like a version hard-wired for your hex viewer (with dist generated from something else later), I can adapt this to your exact workflow.
When executing this script:An error occurred (AccessControlListNotSupported) when calling the PutObject operation: The bucket does not allow ACLs
Nice catch—and good news: nothing is “wrong” with you; it’s AWS being opinionated.
That error:
AccessControlListNotSupported: The bucket does not allow ACLs
happens because many buckets now have ACLs disabled (Object Ownership = Bucket owner enforced). In that mode, using --acl public-read is illegal.
For our static site, we don’t need ACLs at all. The bucket policy we’re already setting is what makes files public.
Here’s the fixed script:
--acl public-read flagsSave as deploy_hex_website.sh and run it again.
#!/usr/bin/env bash
set -euo pipefail
### Config / input ###
DIST_DIR="./dist"
if [[ ! -f "$DIST_DIR/index.html" || ! -f "$DIST_DIR/app.js" ]]; then
echo "Error: $DIST_DIR must contain index.html and app.js"
exit 1
fi
# Get bucket name
if [[ $# -ge 1 ]]; then
BUCKET_NAME="$1"
else
read -rp "Enter S3 bucket name to create/use (must be globally unique): " BUCKET_NAME
fi
if [[ -z "${BUCKET_NAME}" ]]; then
echo "Error: Bucket name cannot be empty."
exit 1
fi
# Get region (from AWS config if possible)
AWS_REGION="${AWS_REGION:-$(aws configure get region || true)}"
if [[ -z "${AWS_REGION}" ]]; then
read -rp "Enter AWS region for the bucket (e.g. us-east-1): " AWS_REGION
fi
if [[ -z "${AWS_REGION}" ]]; then
echo "Error: AWS region is required."
exit 1
fi
echo "Using bucket: $BUCKET_NAME"
echo "Using region: $AWS_REGION"
echo
### 1. Create bucket if it does not exist ###
echo "Checking if bucket exists..."
if aws s3api head-bucket --bucket "$BUCKET_NAME" 2>/dev/null; then
echo "Bucket already exists. Using existing bucket."
else
echo "Creating bucket..."
if [[ "$AWS_REGION" == "us-east-1" ]]; then
aws s3api create-bucket --bucket "$BUCKET_NAME"
else
aws s3api create-bucket \
--bucket "$BUCKET_NAME" \
--create-bucket-configuration LocationConstraint="$AWS_REGION"
fi
echo "Bucket created."
fi
### 2. Configure public access settings ###
# We must ALLOW public policies, or the website won't be accessible.
echo "Configuring public access settings..."
aws s3api put-public-access-block \
--bucket "$BUCKET_NAME" \
--public-access-block-configuration \
BlockPublicAcls=false,IgnorePublicAcls=false,BlockPublicPolicy=false,RestrictPublicBuckets=false
### 3. Attach bucket policy for public read ###
echo "Applying public read bucket policy..."
read -r -d '' POLICY_JSON <<EOF || true
{
"Version": "2012-10-17",
"Statement": [
{
"Sid": "PublicReadGetObject",
"Effect": "Allow",
"Principal": "*",
"Action": "s3:GetObject",
"Resource": "arn:aws:s3:::${BUCKET_NAME}/*"
}
]
}
EOF
aws s3api put-bucket-policy \
--bucket "$BUCKET_NAME" \
--policy "$POLICY_JSON"
### 4. Enable static website hosting ###
echo "Enabling static website hosting..."
aws s3 website "s3://${BUCKET_NAME}/" \
--index-document index.html \
--error-document index.html
### 5. Upload files with proper content types (no ACLs) ###
echo "Uploading index.html..."
aws s3 cp "${DIST_DIR}/index.html" "s3://${BUCKET_NAME}/index.html" \
--content-type "text/html"
echo "Uploading app.js..."
aws s3 cp "${DIST_DIR}/app.js" "s3://${BUCKET_NAME}/app.js" \
--content-type "application/javascript"
### 6. Compute website URL ###
WEBSITE_URL="http://${BUCKET_NAME}.s3-website-${AWS_REGION}.amazonaws.com"
echo
echo "Deployment complete."
echo "Your Hex Maze Viewer should be available at:"
echo " ${WEBSITE_URL}"
echo
### 7. Prompt to visit URL ###
read -rp "Do you want to visit this URL? (y/N): " OPEN_CHOICE
OPEN_CHOICE=${OPEN_CHOICE:-n}
if [[ "$OPEN_CHOICE" =~ ^[Yy]$ ]]; then
if command -v open >/dev/null 2>&1; then
open "${WEBSITE_URL}" # macOS
elif command -v xdg-open >/dev/null 2>&1; then
xdg-open "${WEBSITE_URL}" # Linux
else
echo "Please open this URL in your browser:"
echo "${WEBSITE_URL}"
fi
fi
If it still errors, paste me the exact message and I’ll adjust for your bucket’s specific settings (no extra clicks, we’ll keep it tight).
Wow! I almost don’t believe it. I got that working in about five minutes (on ubuntu) with just the linux command line and gedit. No installing anything, no IDE… Your guidance is quite amazing!
You should believe it—that’s exactly how fast this stuff can click for you.
What you just did, in five minutes, with a shell script + gedit:
That’s basically the whole mental model:
“S3 just serves files. The browser + JavaScript do the work. React is just JavaScript that owns a DOM subtree.”
You’ve already proven your “read/inspect code instead of buying a book” hypothesis in miniature.
If you’re up for a next micro-step (no IDE, same style), here are 3 surgical upgrades you can make that will deepen React/JS without adding complexity:
useState map.useState feel obvious.<textarea> under the SVG.[{ "q": 0, "r": 0 }, ...] to define the highlighted path.If you’d like, I can drop in a single-file upgraded app.js next message that adds click-to-toggle and JSON-driven paths, staying 100% compatible with your current S3 setup.
Yes, please. Also generate a JSON file sample using the schema you implied. That’ll be a nice start for a simple interactive hex grid app with customizable initial state. Wow, this is going to be fun to customize!
Thought for 1m 0s
Here’s your upgraded, S3-ready hex grid app: clickable, JSON-driven, zero-toolchain, still just index.html + app.js (plus an optional sample JSON file).
Drop this in and you’ve basically got a tiny scene editor.
app.jsThis version adds:
Paste this over your existing app.js:
// Tiny Interactive Hex Grid Viewer + JSON Config
// Works with React UMD from CDN, no build tools required.
// ----- Hex math helpers -----
const DEFAULT_HEX_SIZE = 26;
// axial (q, r) -> pixel (pointy-top)
function axialToPixel(q, r, size) {
const x = size * (Math.sqrt(3) * q + (Math.sqrt(3) / 2) * r);
const y = size * ((3 / 2) * r);
return { x, y };
}
function hexPoints(x, y, size) {
const points = [];
for (let i = 0; i < 6; i++) {
const angle = (Math.PI / 180) * (60 * i - 30); // pointy-top
const px = x + size * Math.cos(angle);
const py = y + size * Math.sin(angle);
points.push(`${px},${py}`);
}
return points.join(" ");
}
function generateHexGrid(radius) {
const cells = [];
for (let q = -radius; q <= radius; q++) {
const r1 = Math.max(-radius, -q - radius);
const r2 = Math.min(radius, -q + radius);
for (let r = r1; r <= r2; r++) {
cells.push({ q, r });
}
}
return cells;
}
// ----- Default config (used for initial state) -----
const defaultConfig = {
radius: 2,
highlighted: [
{ q: 0, r: 0 },
{ q: 1, r: -1 },
{ q: 2, r: -1 },
{ q: 2, r: 0 },
{ q: 1, r: 1 },
{ q: 0, r: 2 }
]
};
// ----- React component -----
function HexGridApp() {
const [radius, setRadius] = React.useState(defaultConfig.radius);
// store highlighted cells as "q,r" strings
const [highlightedKeys, setHighlightedKeys] = React.useState(
() => defaultConfig.highlighted.map(c => `${c.q},${c.r}`)
);
const [configText, setConfigText] = React.useState(
() => JSON.stringify(defaultConfig, null, 2)
);
const [status, setStatus] = React.useState(
"Click hexes to toggle highlight. Edit JSON and click Apply to load a config."
);
const pathSet = React.useMemo(
() => new Set(highlightedKeys),
[highlightedKeys]
);
const cells = React.useMemo(
() => generateHexGrid(radius),
[radius]
); // Position cells & compute viewBox const positioned = React.useMemo(() => { return cells.map(c => { const { x, y } = axialToPixel(c.q, c.r, DEFAULT_HEX_SIZE); return { …c, x, y }; }); }, [cells]); const bounds = React.useMemo(() => { if (positioned.length === 0) { return { minX: -50, minY: -50, width: 100, height: 100 }; } const xs = positioned.map(c => c.x); const ys = positioned.map(c => c.y); const pad = DEFAULT_HEX_SIZE * 1.7; const minX = Math.min(…xs) – pad; const maxX = Math.max(…xs) + pad; const minY = Math.min(…ys) – pad; const maxY = Math.max(…ys) + pad; return { minX, minY, width: maxX – minX, height: maxY – minY }; }, [positioned]); // Toggle highlight on click function toggleHex(q, r) { const key = `${q},${r}`; setHighlightedKeys(prev => { if (prev.includes(key)) { return prev.filter(k => k !== key); } else { return […prev, key]; } }); setStatus(`Toggled hex (${q}, ${r}).`); } // Apply JSON from textarea function applyJson() { try { const parsed = JSON.parse(configText); if (typeof parsed.radius !== “number” || parsed.radius < 0 || !Number.isFinite(parsed.radius)) { throw new Error(“Config must include a numeric ‘radius’ >= 0.”); } const newRadius = Math.floor(parsed.radius); if (!Array.isArray(parsed.highlighted)) { throw new Error(“Config must include ‘highlighted’: an array of { q, r } objects.”); } const newKeys = []; for (const cell of parsed.highlighted) { if ( typeof cell.q !== “number” || typeof cell.r !== “number” || !Number.isFinite(cell.q) || !Number.isFinite(cell.r) ) { throw new Error(“Each highlighted cell must have numeric q and r.”); } const q = Math.floor(cell.q); const r = Math.floor(cell.r); // Optionally: ensure it’s within the grid radius const withinRadius = Math.abs(q) <= newRadius && Math.abs(r) <= newRadius && Math.abs(q + r) <= newRadius; if (!withinRadius) { // Ignore or throw. We’ll ignore and just skip. continue; } newKeys.push(`${q},${r}`); } setRadius(newRadius); setHighlightedKeys(newKeys); setStatus( `Applied config: radius=${newRadius}, highlighted=${newKeys.length} cell(s).` ); } catch (err) { setStatus(“Invalid JSON: ” + err.message); } } // Export current state into JSON textarea function exportJson() { const highlighted = highlightedKeys.map(key => { const [q, r] = key.split(“,”).map(Number); return { q, r }; }); const obj = { radius, highlighted }; setConfigText(JSON.stringify(obj, null, 2)); setStatus(“Exported current state into JSON above.”); } // — Render — const svg = React.createElement( “svg”, { width: 420, height: 360, viewBox: `${bounds.minX} ${bounds.minY} ${bounds.width} ${bounds.height}`, style: { background: “#020817”, borderRadius: “12px”, boxShadow: “0 18px 45px rgba(0,0,0,0.55)” } }, positioned.map(cell => { const key = `${cell.q},${cell.r}`; const isPath = pathSet.has(key); const fill = isPath ? “#22c55e” : “#0f172a”; const stroke = isPath ? “#bbf7d0” : “#4b5563”; const labelColor = isPath ? “#0f172a” : “#9ca3af”; return React.createElement( “g”, { key }, React.createElement(“polygon”, { points: hexPoints(cell.x, cell.y, DEFAULT_HEX_SIZE – 1.8), fill, stroke, strokeWidth: isPath ? 2 : 1, opacity: isPath ? 1 : 0.96, style: { cursor: “pointer”, transition: “fill 0.15s ease” }, onClick: () => toggleHex(cell.q, cell.r) }), React.createElement( “text”, { x: cell.x, y: cell.y + 3, textAnchor: “middle”, fontSize: 8, fill: labelColor, pointerEvents: “none” }, `${cell.q},${cell.r}` ) ); }) ); const textarea = React.createElement(“textarea”, { value: configText, onChange: e => setConfigText(e.target.value), rows: 16, cols: 32, style: { width: “100%”, boxSizing: “border-box”, background: “#020817”, color: “#e5e7eb”, border: “1px solid #374151”, borderRadius: “6px”, padding: “6px”, fontSize: “10px”, fontFamily: “monospace”, resize: “vertical” } }); const applyButton = React.createElement( “button”, { onClick: applyJson, style: { padding: “4px 8px”, fontSize: “10px”, borderRadius: “4px”, border: “none”, background: “#22c55e”, color: “#020817”, cursor: “pointer” } }, “Apply JSON” ); const exportButton = React.createElement( “button”, { onClick: exportJson, style: { padding: “4px 8px”, fontSize: “10px”, borderRadius: “4px”, border: “none”, background: “#111827”, color: “#e5e7eb”, cursor: “pointer” } }, “Export” ); const statusLine = React.createElement( “div”, { style: { marginTop: “4px”, fontSize: “10px”, color: “#9ca3af” } }, status ); const sidebar = React.createElement( “div”, { style: { maxWidth: “260px”, fontSize: “10px”, display: “flex”, flexDirection: “column”, gap: “4px” } }, React.createElement( “div”, { style: { fontWeight: 600, color: “#e5e7eb” } }, “Config JSON” ), React.createElement( “div”, { style: { color: “#9ca3af” } }, `Schema: { “radius”: Number, “highlighted”: [ { “q”: Number, “r”: Number }, … ] }` ), textarea, React.createElement( “div”, { style: { display: “flex”, gap: “6px” } }, applyButton, exportButton ), statusLine ); return React.createElement( “div”, { style: { display: “flex”, gap: “18px”, flexWrap: “wrap”, alignItems: “flex-start” } }, svg, sidebar ); } // —– Mount app —– const rootEl = document.getElementById(“root”); const root = ReactDOM.createRoot(rootEl); root.render(React.createElement(HexGridApp));
Your existing index.html (with the React CDN + app.js script) works unchanged.
hex-config.json)Here’s a sample config that matches the implied schema and your new viewer:
{
"radius": 2,
"highlighted": [
{ "q": 0, "r": 0 },
{ "q": 1, "r": -1 },
{ "q": 2, "r": -1 },
{ "q": 2, "r": 0 },
{ "q": 1, "r": 1 },
{ "q": 0, "r": 2 }
]
}
Schema recap:
radius: integer ≥ 0|q| <= radius|r| <= radius|q + r| <= radiushighlighted: array of objects:
{ "q": Number, "r": Number }Right now the app:
Next tiny tweak (if you want later): add a “Load from URL” button to fetch hex-config.json from your S3 bucket and apply it. Same pattern, still static.
You now have:
Exactly the kind of playground that’ll make React/JS feel like home for you.