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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>The JavaScript Evolution — ES3 to ES2026</title>
<script>try{if(matchMedia('(prefers-color-scheme: light)').matches)document.documentElement.setAttribute('data-theme','light');else document.documentElement.setAttribute('data-theme','dark');}catch(e){document.documentElement.setAttribute('data-theme','dark');}</script>
<style>
:root{
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--t-key:#c792ea; --t-str:#c3e88d; --t-num:#f78c6c; --t-com:#5b6171;
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--js-dim:rgba(154,107,0,.10); --js-line:rgba(154,107,0,.35);
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</style>
</head>
<body>
<header>
<p class="eyebrow">A live, editable history of a language</p>
<h1>The JavaScript<br>Evolution<span class="y">.</span></h1>
<p class="lede">Every feature below is the real thing — it runs in your browser right now.
Edit any snippet and press <kbd>Run</kbd>. Walk the language from <code>try/catch</code> in
1999 all the way to <code>Temporal</code> in 2026.</p>
<div class="legend">
<span><b>14</b> editions</span>
<span><b>27</b> years</span>
<span><b>40+</b> runnable features</span>
<span>Tip: <kbd>Ctrl</kbd>/<kbd>⌘</kbd> + <kbd>Enter</kbd> runs the focused editor</span>
</div>
</header>
<div class="rail-wrap">
<nav class="rail" id="rail" aria-label="Timeline"></nav>
<button id="themeToggle" class="theme-toggle" type="button" aria-label="Toggle light and dark theme"></button>
</div>
<div class="shell">
<aside><h2>Editions</h2><div id="nav"></div></aside>
<main id="main"></main>
</div>
<footer>
Built as a single, dependency-free HTML file — the irony of a JavaScript history with no framework is intentional.
Bleeding-edge ES2026 features (<code style="font-family:var(--mono)">Temporal</code>, <code style="font-family:var(--mono)">Math.sumPrecise</code>, byte/base64 helpers) feature-detect at
runtime and explain themselves if your browser hasn't shipped them yet.
ES2026 is the 17th edition, finalized in the 2025–26 TC39 cycle.
</footer>
<script>
/* ============================================================
DATA — eras and their features (code lives in #codebank)
============================================================ */
const ERAS = [
{ id:"es3", yr:"1999", ed:"ES1–ES3", name:"The Foundations",
blurb:"The first decade settled the basics every later feature builds on: structured error handling and a real regular-expression engine.",
features:[
{ft:"try / catch / finally", code:"es3-try", desc:"Structured error handling, with a finally block that always runs."},
{ft:"Regular expressions", code:"es3-regex", desc:"Literal regex syntax with capture groups, flags, exec, and test."},
]},
{ id:"es5", yr:"2009", ed:"ES5", name:"The Cleanup",
blurb:"After the abandoned ES4, ES5 modernized the standard library: functional array methods, native JSON, property descriptors, and strict mode.",
features:[
{ft:"Array iteration methods", code:"es5-array", desc:"map, filter, reduce, forEach, every, indexOf — the functional toolkit, plus 'use strict'."},
{ft:"Native JSON", code:"es5-json", desc:"JSON.stringify and JSON.parse, finally built into the language."},
{ft:"Getters, setters & descriptors", code:"es5-define", desc:"Object.defineProperty with accessor functions and fine-grained control."},
{ft:"Function.prototype.bind", code:"es5-bind", desc:"Lock a function's `this` and create a reusable bound copy."},
]},
{ id:"es2015", yr:"2015", ed:"ES2015 · ES6", name:"The Renaissance",
blurb:"The largest update in the language's history. So much arrived at once that ES6 effectively split JavaScript into 'before' and 'after'.",
features:[
{ft:"let & const", code:"es6-let", desc:"Block scoping replaces the foot-guns of var hoisting."},
{ft:"Arrow functions", code:"es6-arrow", desc:"Concise functions with a lexical `this`."},
{ft:"Template literals", code:"es6-tmpl", desc:"Interpolation with ${} and real multi-line strings."},
{ft:"Destructuring", code:"es6-destr", desc:"Pull values out of objects and arrays by shape, with defaults and rest."},
{ft:"Default, rest & spread", code:"es6-spread", desc:"Default params, variadic rest, and the spread operator for arrays and objects."},
{ft:"Classes", code:"es6-class", desc:"Syntactic sugar over prototypes, with extends and super."},
{ft:"Promises", code:"es6-promise", desc:"First-class async with then, Promise.all, and Promise.race."},
{ft:"Generators & iterators", code:"es6-gen", desc:"Pausable functions and the Symbol.iterator protocol."},
{ft:"Map & Set", code:"es6-mapset", desc:"Real keyed collections and unique-value sets."},
{ft:"Symbol", code:"es6-symbol", desc:"Unique, non-colliding keys — the basis of language protocols."},
{ft:"Proxy & Reflect", code:"es6-proxy", desc:"Intercept and customize fundamental object operations."},
{ft:"Modules", code:"es6-modules", desc:"Standardized import / export. (Needs a module context, so this is a syntax preview.)", illustrative:true},
]},
{ id:"es2016", yr:"2016", ed:"ES2016", name:"Small but mighty",
blurb:"TC39 switched to a yearly cadence. The first annual release was deliberately tiny — just two additions — to prove the process worked.",
features:[
{ft:"includes() & exponentiation", code:"es2016-misc", desc:"Array.includes (which finds NaN) and the ** operator."},
]},
{ id:"es2017", yr:"2017", ed:"ES2017", name:"Async arrives",
blurb:"async / await turned promise chains into code that reads top-to-bottom — arguably the most loved syntax since arrow functions.",
features:[
{ft:"async / await", code:"es2017-async", desc:"Write asynchronous code that reads like synchronous code."},
{ft:"Object & String helpers", code:"es2017-obj", desc:"Object.entries, Object.values, String.padStart and padEnd."},
]},
{ id:"es2018", yr:"2018", ed:"ES2018", name:"Spreading out",
blurb:"Spread and rest grew to cover objects, regex gained named groups, and promises got a guaranteed cleanup hook.",
features:[
{ft:"Object spread & rest", code:"es2018-spread", desc:"The {...obj} pattern, now for merging and collecting object properties."},
{ft:"Named capture groups", code:"es2018-regex", desc:"Reference regex matches by name instead of numeric index."},
{ft:"Promise.finally", code:"es2018-finally", desc:"Run cleanup whether the promise fulfills or rejects."},
]},
{ id:"es2019", yr:"2019", ed:"ES2019", name:"Flattening",
blurb:"Practical array and object reshaping: flatten nested arrays and rebuild objects from key/value pairs.",
features:[
{ft:"Array flat & flatMap", code:"es2019-flat", desc:"Flatten nested arrays to any depth, or map-then-flatten in one pass."},
{ft:"Object.fromEntries", code:"es2019-entries", desc:"The inverse of Object.entries — turn pairs back into an object."},
{ft:"trimStart & trimEnd", code:"es2019-trim", desc:"Trim whitespace from one side of a string."},
]},
{ id:"es2020", yr:"2020", ed:"ES2020", name:"Safer access",
blurb:"Optional chaining and nullish coalescing eliminated mountains of defensive boilerplate. BigInt added arbitrary-precision integers.",
features:[
{ft:"?. and ??", code:"es2020-chain", desc:"Optional chaining and nullish coalescing — safe access, sane defaults."},
{ft:"BigInt, globalThis, matchAll", code:"es2020-bigint", desc:"Arbitrary-precision integers, a universal global, and iterable regex matches."},
]},
{ id:"es2021", yr:"2021", ed:"ES2021", name:"Quality of life",
blurb:"Logical assignment operators, readable numeric literals, and string/promise conveniences.",
features:[
{ft:"Logical assignment", code:"es2021-assign", desc:"??=, ||= and &&= combine a check and an assignment."},
{ft:"Separators, replaceAll, any", code:"es2021-misc", desc:"1_000_000, String.replaceAll, and Promise.any."},
]},
{ id:"es2022", yr:"2022", ed:"ES2022", name:"Class act",
blurb:"Classes matured with real private fields, static blocks, and static fields. Plus negative indexing with .at().",
features:[
{ft:"Class fields & private #", code:"es2022-class", desc:"Public/private instance fields, static fields, and static init blocks."},
{ft:"at(), hasOwn, error cause", code:"es2022-misc", desc:"Negative indexing, a safer hasOwnProperty, and error chaining."},
]},
{ id:"es2023", yr:"2023", ed:"ES2023", name:"Immutable arrays",
blurb:"Change-by-copy array methods return new arrays instead of mutating — a perfect fit for state in React and friends.",
features:[
{ft:"toSorted / toReversed / with", code:"es2023-copy", desc:"Non-mutating versions of sort, reverse, splice, and index assignment."},
{ft:"findLast & findLastIndex", code:"es2023-findlast", desc:"Search an array from the end."},
]},
{ id:"es2024", yr:"2024", ed:"ES2024", name:"Grouping & control",
blurb:"Group collections by a key without a utility library, and gain external control over a promise's resolution.",
features:[
{ft:"Object.groupBy", code:"es2024-group", desc:"Bucket items into an object keyed by a callback's result."},
{ft:"Promise.withResolvers", code:"es2024-resolvers", desc:"Get a promise plus its resolve/reject functions in one call."},
]},
{ id:"es2025", yr:"2025", ed:"ES2025", name:"Iterators & sets",
blurb:"Lazy iterator helpers, real set algebra, and small fixes that had been requested for years.",
features:[
{ft:"Iterator helpers", code:"es2025-iter", desc:"map, filter, take, drop, toArray — lazily, on any iterator."},
{ft:"Set methods", code:"es2025-set", desc:"union, intersection, difference, and subset/superset checks."},
{ft:"Promise.try", code:"es2025-try", desc:"Start a promise chain from sync code with unified error handling."},
{ft:"RegExp.escape", code:"es2025-escape", desc:"Safely escape user input for use inside a RegExp."},
]},
{ id:"es2026", yr:"2026", ed:"ES2026", name:"Time, finally",
blurb:"The latest finalized edition. After roughly nine years in committee, the Temporal API lands — alongside automatic resource cleanup and precise math.",
features:[
{ft:"Temporal", code:"es2026-temporal", desc:"An immutable, time-zone-aware replacement for the broken Date object."},
{ft:"using (explicit resource management)", code:"es2026-using", desc:"Automatic, deterministic cleanup when a scope exits. (Syntax preview — many runtimes don't parse `using` yet.)", illustrative:true},
{ft:"…what `using` automates", code:"es2026-dispose", desc:"The Symbol.dispose / try-finally lifecycle that `using` desugars to — runnable today."},
{ft:"Math.sumPrecise", code:"es2026-sum", desc:"Sum an array of floats without accumulating rounding error."},
{ft:"Error.isError", code:"es2026-iserror", desc:"Reliably detect real Error objects, even across realms."},
{ft:"Uint8Array base64 / hex", code:"es2026-base64", desc:"Built-in byte encoding without atob/btoa gymnastics."},
]},
];
const CODE = {
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"es6-spread": "ZnVuY3Rpb24gbWFrZVVzZXIobmFtZSwgcm9sZSA9ICJndWVzdCIsIC4uLnRhZ3MpIHsKICByZXR1cm4geyBuYW1lLCByb2xlLCB0YWdzIH07Cn0KCmNvbnNvbGUubG9nKG1ha2VVc2VyKCJCbyIpKTsKY29uc29sZS5sb2cobWFrZVVzZXIoIkN5IiwgImFkbWluIiwgImNvcmUiLCAiYmV0YSIpKTsKCmNvbnN0IGEgPSBbMSwgMl0sIGIgPSBbMywgNF07CmNvbnNvbGUubG9nKCJzcHJlYWQgYXJyYXlzOiIsIFsuLi5hLCAuLi5iXSk7CmNvbnNvbGUubG9nKCJzcHJlYWQgb2JqZWN0czoiLCB7IC4uLnsgaWQ6IDEgfSwgYWN0aXZlOiB0cnVlIH0pOw==",
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"es6-symbol": "Y29uc3QgSUQgPSBTeW1ib2woImlkIik7CmNvbnN0IHVzZXIgPSB7IG5hbWU6ICJBZGEiLCBbSURdOiA0MiB9OwoKY29uc29sZS5sb2codXNlci5uYW1lLCAifCBoaWRkZW46IiwgdXNlcltJRF0pOwpjb25zb2xlLmxvZygibm90IGluIGtleXM6IiwgT2JqZWN0LmtleXModXNlcikpOwpjb25zb2xlLmxvZygiZXZlcnkgU3ltYm9sIGlzIHVuaXF1ZToiLCBTeW1ib2woIngiKSA9PT0gU3ltYm9sKCJ4IikpOw==",
"es6-proxy": "Y29uc3QgdGFyZ2V0ID0geyBtc2c6ICJoaSIgfTsKCmNvbnN0IHNhZmUgPSBuZXcgUHJveHkodGFyZ2V0LCB7CiAgZ2V0KG9iaiwgcHJvcCkgewogICAgcmV0dXJuIHByb3AgaW4gb2JqCiAgICAgID8gUmVmbGVjdC5nZXQob2JqLCBwcm9wKQogICAgICA6IGA8bm8gcHJvcGVydHkgIiR7U3RyaW5nKHByb3ApfSI+YDsKICB9Cn0pOwoKY29uc29sZS5sb2coc2FmZS5tc2cpOwpjb25zb2xlLmxvZyhzYWZlLm1pc3NpbmcpOyAgIC8vIGludGVyY2VwdGVkLCBubyBjcmFzaA==",
"es6-modules": "Ly8gLS0tIG1hdGguanMgLS0tCmV4cG9ydCBjb25zdCBhZGQgPSAoYSwgYikgPT4gYSArIGI7CmV4cG9ydCBkZWZhdWx0IGZ1bmN0aW9uIG11bHRpcGx5KGEsIGIpIHsgcmV0dXJuIGEgKiBiOyB9CgovLyAtLS0gYXBwLmpzIC0tLQppbXBvcnQgbXVsdGlwbHksIHsgYWRkIH0gZnJvbSAiLi9tYXRoLmpzIjsKCmNvbnNvbGUubG9nKGFkZCgyLCAzKSk7ICAgICAgICAvLyA1CmNvbnNvbGUubG9nKG11bHRpcGx5KDIsIDMpKTsgICAvLyA2",
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"es2017-async": "Y29uc3Qgd2FpdCA9IChtcywgdikgPT4gbmV3IFByb21pc2UociA9PiBzZXRUaW1lb3V0KCgpID0+IHIodiksIG1zKSk7Cgphc3luYyBmdW5jdGlvbiBsb2FkRGFzaGJvYXJkKCkgewogIGNvbnN0IHByb2ZpbGUgPSBhd2FpdCB3YWl0KDEwLCAicHJvZmlsZSBsb2FkZWQiKTsKICBjb25zdCBzZXR0aW5ncyA9IGF3YWl0IHdhaXQoMTAsICJzZXR0aW5ncyBsb2FkZWQiKTsKICByZXR1cm4gW3Byb2ZpbGUsIHNldHRpbmdzXTsKfQoKY29uc29sZS5sb2coYXdhaXQgbG9hZERhc2hib2FyZCgpKTs=",
"es2017-obj": "Y29uc3QgdXNlciA9IHsgbmFtZTogIkFkYSIsIGFnZTogMzAgfTsKCmNvbnNvbGUubG9nKCJlbnRyaWVzOiIsIE9iamVjdC5lbnRyaWVzKHVzZXIpKTsKY29uc29sZS5sb2coInZhbHVlczoiLCBPYmplY3QudmFsdWVzKHVzZXIpKTsKCmNvbnNvbGUubG9nKCJ6ZXJvLXBhZGRlZDoiLCAiNyIucGFkU3RhcnQoMywgIjAiKSk7CmNvbnNvbGUubG9nKCJkb3QtcGFkZGVkOiIsICJoaSIucGFkRW5kKDUsICIuIikpOw==",
"es2018-spread": "Y29uc3QgYmFzZSA9IHsgYTogMSwgYjogMiB9Owpjb25zdCBuZXh0ID0geyAuLi5iYXNlLCBjOiAzIH07ICAgICAgIC8vIG9iamVjdCBzcHJlYWQKY29uc3QgeyBhLCAuLi5vdGhlcnMgfSA9IG5leHQ7ICAgICAgICAvLyBvYmplY3QgcmVzdAoKY29uc29sZS5sb2coIm1lcmdlZDoiLCBuZXh0KTsKY29uc29sZS5sb2coInBsdWNrZWQgYToiLCBhLCAifCByZXN0OiIsIG90aGVycyk7",
"es2018-regex": "Y29uc3QgcmUgPSAvKD88eWVhcj5cZHs0fSktKD88bW9udGg+XGR7Mn0pLzsgICAvLyBuYW1lZCBjYXB0dXJlIGdyb3Vwcwpjb25zdCBtID0gIjIwMjYtMDYiLm1hdGNoKHJlKTsKCmNvbnNvbGUubG9nKCJ5ZWFyOiIsIG0uZ3JvdXBzLnllYXIpOwpjb25zb2xlLmxvZygibW9udGg6IiwgbS5ncm91cHMubW9udGgpOw==",
"es2018-finally": "Y29uc3Qgd2FpdCA9IChtcywgdikgPT4gbmV3IFByb21pc2UociA9PiBzZXRUaW1lb3V0KCgpID0+IHIodiksIG1zKSk7Cgpjb25zdCBkYXRhID0gYXdhaXQgd2FpdCgxMCwgInBheWxvYWQiKQogIC5maW5hbGx5KCgpID0+IGNvbnNvbGUubG9nKCJjbGVhbnVwIHJ1bnMgbm8gbWF0dGVyIHdoYXQiKSk7Cgpjb25zb2xlLmxvZygiZ290OiIsIGRhdGEpOw==",
"es2019-flat": "Y29uc3QgbmVzdGVkID0gWzEsIFsyLCBbMywgWzRdXV1dOwpjb25zb2xlLmxvZygiZmxhdChJbmZpbml0eSk6IiwgbmVzdGVkLmZsYXQoSW5maW5pdHkpKTsKCmNvbnNvbGUubG9nKCJmbGF0TWFwOiIsIFsxLCAyLCAzXS5mbGF0TWFwKG4gPT4gW24sIG4gKiAxMF0pKTs=",
"es2019-entries": "Y29uc3QgcGFpcnMgPSBbWyJhIiwgMV0sIFsiYiIsIDJdLCBbImMiLCAzXV07CmNvbnNvbGUubG9nKCJmcm9tRW50cmllczoiLCBPYmplY3QuZnJvbUVudHJpZXMocGFpcnMpKTsKCi8vIHJvdW5kLXRyaXA6IG9iamVjdCAtPiBlbnRyaWVzIC0+IHRyYW5zZm9ybSAtPiBvYmplY3QKY29uc3QgcHJpY2VzID0geyBwZW46IDIsIGJvb2s6IDggfTsKY29uc3Qgd2l0aFRheCA9IE9iamVjdC5mcm9tRW50cmllcygKICBPYmplY3QuZW50cmllcyhwcmljZXMpLm1hcCgoW2ssIHZdKSA9PiBbaywgdiAqIDEuMV0pCik7CmNvbnNvbGUubG9nKCJ3aXRoIHRheDoiLCB3aXRoVGF4KTs=",
"es2019-trim": "Y29uc3QgcGFkZGVkID0gIiAgIHRyaW0gbWUgICAiOwpjb25zb2xlLmxvZygiWyIgKyBwYWRkZWQudHJpbVN0YXJ0KCkgKyAiXSIpOwpjb25zb2xlLmxvZygiWyIgKyBwYWRkZWQudHJpbUVuZCgpICsgIl0iKTs=",
"es2020-chain": "Y29uc3QgZGF0YSA9IHsgcHJvZmlsZTogeyBjb250YWN0OiBudWxsIH0gfTsKCmNvbnNvbGUubG9nKGRhdGE/LnByb2ZpbGU/LmNvbnRhY3Q/LmVtYWlsID8/ICJubyBlbWFpbCBvbiBmaWxlIik7CmNvbnNvbGUubG9nKGRhdGE/Lm1pc3Npbmc/LmRlZXBseT8ubmVzdGVkKTsgICAgIC8vIHVuZGVmaW5lZCwgbm8gZXJyb3IKCmNvbnN0IGNvdW50ID0gMDsKY29uc29sZS5sb2coIj8/IGtlZXBzIDA6IiwgY291bnQgPz8gImZhbGxiYWNrIik7ICAvLyAwCmNvbnNvbGUubG9nKCJ8fCBkcm9wcyAwOiIsIGNvdW50IHx8ICJmYWxsYmFjayIpOyAgLy8gImZhbGxiYWNrIg==",
"es2020-bigint": "Y29uc3QgaHVnZSA9IDkwMDcxOTkyNTQ3NDA5OTFuOyAgICAgLy8gQmlnSW50IGxpdGVyYWwKY29uc29sZS5sb2coImJleW9uZCBzYWZlIGludDoiLCBodWdlICsgMm4pOwoKY29uc29sZS5sb2coImdsb2JhbFRoaXMgd29ya3MgZXZlcnl3aGVyZToiLCB0eXBlb2YgZ2xvYmFsVGhpcyk7Cgpjb25zdCB0ZXh0ID0gImExYjJjMyI7CmNvbnNvbGUubG9nKCJtYXRjaEFsbDoiLCBbLi4udGV4dC5tYXRjaEFsbCgvKFxkKS9nKV0ubWFwKHggPT4geFsxXSkpOw==",
"es2021-assign": "Y29uc3QgY29uZmlnID0geyByZXRyaWVzOiBudWxsLCBtb2RlOiAiIiwgY2FjaGU6IDUgfTsKCmNvbmZpZy5yZXRyaWVzID8/PSAzOyAgICAvLyBhc3NpZ24gb25seSBpZiBudWxsL3VuZGVmaW5lZApjb25maWcubW9kZSAgICB8fD0gImRlZmF1bHQiOyAgLy8gYXNzaWduIGlmIGZhbHN5CmNvbmZpZy5jYWNoZSAgICYmPSAxMDsgICAvLyBhc3NpZ24gb25seSBpZiB0cnV0aHkKCmNvbnNvbGUubG9nKGNvbmZpZyk7",
"es2021-misc": "Y29uc3QgYmlnID0gMV8wMDBfMDAwOyAgICAgICAgICAvLyBudW1lcmljIHNlcGFyYXRvcnMgKGp1c3QgdmlzdWFsKQpjb25zb2xlLmxvZygicmVhZGFibGUgbnVtYmVyOiIsIGJpZyk7Cgpjb25zb2xlLmxvZygicmVwbGFjZUFsbDoiLCAiYS1iLWMtZCIucmVwbGFjZUFsbCgiLSIsICIvIikpOwoKY29uc3Qgd2FpdCA9IChtcywgdikgPT4gbmV3IFByb21pc2UociA9PiBzZXRUaW1lb3V0KCgpID0+IHIodiksIG1zKSk7CmNvbnN0IGZhc3Rlc3QgPSBhd2FpdCBQcm9taXNlLmFueShbd2FpdCgyMCwgInNsb3ciKSwgd2FpdCg1LCAiZmFzdCIpXSk7CmNvbnNvbGUubG9nKCJmaXJzdCB0byByZXNvbHZlOiIsIGZhc3Rlc3QpOw==",
"es2022-class": "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",
"es2022-misc": "Y29uc3QgYXJyID0gWzEwLCAyMCwgMzAsIDQwXTsKY29uc29sZS5sb2coImF0KC0xKToiLCBhcnIuYXQoLTEpKTsgICAgLy8gbGFzdCBpdGVtLCBubyBsZW5ndGggbWF0aApjb25zb2xlLmxvZygiYXQoLTIpOiIsIGFyci5hdCgtMikpOwoKY29uc29sZS5sb2coImhhc093bjoiLCBPYmplY3QuaGFzT3duKHsgeDogMSB9LCAieCIpKTsKY29uc29sZS5sb2coImhhc093biAobWlzc2luZyk6IiwgT2JqZWN0Lmhhc093bih7IHg6IDEgfSwgInkiKSk7Cgpjb25zdCB3cmFwcGVkID0gbmV3IEVycm9yKCJoaWdoIGxldmVsIiwgeyBjYXVzZTogImxvdyBsZXZlbCBkZXRhaWwiIH0pOwpjb25zb2xlLmxvZygiZXJyb3IgY2F1c2U6Iiwgd3JhcHBlZC5jYXVzZSk7",
"es2023-copy": "Y29uc3QgbnVtcyA9IFszLCAxLCAyXTsKCmNvbnN0IHNvcnRlZCA9IG51bXMudG9Tb3J0ZWQoKTsgICAvLyByZXR1cm5zIGEgTkVXIGFycmF5CmNvbnNvbGUubG9nKCJzb3J0ZWQ6Iiwgc29ydGVkKTsKY29uc29sZS5sb2coIm9yaWdpbmFsIHVudG91Y2hlZDoiLCBudW1zKTsKCmNvbnNvbGUubG9nKCJ0b1JldmVyc2VkOiIsIG51bXMudG9SZXZlcnNlZCgpKTsKY29uc29sZS5sb2coIndpdGgoMCwgOTkpOiIsIG51bXMud2l0aCgwLCA5OSkpOw==",
"es2023-findlast": "Y29uc3QgZGF0YSA9IFt7IHY6IDEgfSwgeyB2OiA5IH0sIHsgdjogNCB9LCB7IHY6IDcgfV07Cgpjb25zb2xlLmxvZygiZmluZExhc3QgdiA+IDM6IiwgZGF0YS5maW5kTGFzdChvID0+IG8udiA+IDMpKTsKY29uc29sZS5sb2coImZpbmRMYXN0SW5kZXggdiA+IDM6IiwgZGF0YS5maW5kTGFzdEluZGV4KG8gPT4gby52ID4gMykpOw==",
"es2024-group": "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",
"es2024-resolvers": "Ly8gUHJvbWlzZS53aXRoUmVzb2x2ZXJzIGhhbmRzIHlvdSB0aGUgcmVzb2x2ZS9yZWplY3QgZnVuY3Rpb25zIHVwIGZyb250CmNvbnN0IHsgcHJvbWlzZSwgcmVzb2x2ZSB9ID0gUHJvbWlzZS53aXRoUmVzb2x2ZXJzKCk7CgpzZXRUaW1lb3V0KCgpID0+IHJlc29sdmUoInNldHRsZWQgZnJvbSB0aGUgb3V0c2lkZSIpLCAxMCk7Cgpjb25zb2xlLmxvZygid2FpdGluZy4uLiIpOwpjb25zb2xlLmxvZyhhd2FpdCBwcm9taXNlKTs=",
"es2025-iter": "ZnVuY3Rpb24qIG5hdHVyYWxzKCkgeyBsZXQgbiA9IDE7IHdoaWxlICh0cnVlKSB5aWVsZCBuKys7IH0KCi8vIGxhenkgaXRlcmF0b3IgaGVscGVycyDigJQgbm90aGluZyBjb21wdXRlcyB1bnRpbCAudG9BcnJheSgpCmNvbnN0IHJlc3VsdCA9IG5hdHVyYWxzKCkKICAubWFwKG4gPT4gbiAqIG4pCiAgLmZpbHRlcihuID0+IG4gJSAyID09PSAxKQogIC50YWtlKDUpCiAgLnRvQXJyYXkoKTsKCmNvbnNvbGUubG9nKCJmaXJzdCA1IG9kZCBzcXVhcmVzOiIsIHJlc3VsdCk7",
"es2025-set": "Y29uc3QgYSA9IG5ldyBTZXQoWzEsIDIsIDMsIDRdKTsKY29uc3QgYiA9IG5ldyBTZXQoWzMsIDQsIDUsIDZdKTsKCmNvbnNvbGUubG9nKCJ1bmlvbjoiLCBbLi4uYS51bmlvbihiKV0pOwpjb25zb2xlLmxvZygiaW50ZXJzZWN0aW9uOiIsIFsuLi5hLmludGVyc2VjdGlvbihiKV0pOwpjb25zb2xlLmxvZygiZGlmZmVyZW5jZToiLCBbLi4uYS5kaWZmZXJlbmNlKGIpXSk7CmNvbnNvbGUubG9nKCJkaXNqb2ludCBmcm9tIHs5fT8iLCBhLmlzRGlzam9pbnRGcm9tKG5ldyBTZXQoWzldKSkpOw==",
"es2025-try": "ZnVuY3Rpb24gcmlza3koeCkgewogIGlmICh4IDwgMCkgdGhyb3cgbmV3IEVycm9yKCJuZWdhdGl2ZSBpbnB1dCIpOwogIHJldHVybiB4ICogMjsKfQoKLy8gUHJvbWlzZS50cnkgcnVucyBzeW5jIGNvZGUgYnV0IGFsd2F5cyBnaXZlcyB5b3UgYSBQcm9taXNlICsgdW5pZmllZCBlcnJvcnMKY29uc29sZS5sb2coIm9rOiIsIGF3YWl0IFByb21pc2UudHJ5KCgpID0+IHJpc2t5KDUpKSk7Cgphd2FpdCBQcm9taXNlLnRyeSgoKSA9PiByaXNreSgtMSkpLmNhdGNoKGUgPT4gY29uc29sZS5sb2coImNhdWdodDoiLCBlLm1lc3NhZ2UpKTs=",
"es2025-escape": "Y29uc3QgdXNlcklucHV0ID0gImErYiAoYyk/IjsKCmlmICh0eXBlb2YgUmVnRXhwLmVzY2FwZSA9PT0gImZ1bmN0aW9uIikgewogIGNvbnN0IHNhZmUgPSBSZWdFeHAuZXNjYXBlKHVzZXJJbnB1dCk7CiAgY29uc29sZS5sb2coImVzY2FwZWQ6Iiwgc2FmZSk7CiAgY29uc29sZS5sb2coImxpdGVyYWwgbWF0Y2ggd29ya3M6IiwgbmV3IFJlZ0V4cChzYWZlKS50ZXN0KCJhK2IgKGMpPyIpKTsKfSBlbHNlIHsKICBjb25zb2xlLmxvZygiUmVnRXhwLmVzY2FwZSBub3QgaW4gdGhpcyBydW50aW1lIHlldCAoRVMyMDI1KS4iKTsKfQ==",
"es2026-temporal": "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",
"es2026-using": "Ly8gRVMyMDI2OiBkZXRlcm1pbmlzdGljLCBhdXRvbWF0aWMgY2xlYW51cCB3aXRoIGB1c2luZ2AKZnVuY3Rpb24gb3BlbkZpbGUobmFtZSkgewogIHJldHVybiB7CiAgICBuYW1lLAogICAgW1N5bWJvbC5kaXNwb3NlXSgpIHsgY29uc29sZS5sb2coYGNsb3NpbmcgJHtuYW1lfWApOyB9CiAgfTsKfQoKewogIHVzaW5nIGZpbGUgPSBvcGVuRmlsZSgiZGF0YS50eHQiKTsKICBjb25zb2xlLmxvZyhgcmVhZGluZyAke2ZpbGUubmFtZX1gKTsKfSAgIC8vIGZpbGVbU3ltYm9sLmRpc3Bvc2VdKCkgcnVucyBhdXRvbWF0aWNhbGx5IGFzIHRoZSBibG9jayBleGl0cw==",
"es2026-dispose": "Ly8gVGhlIHNhbWUgbGlmZWN5Y2xlIHRoYXQgYHVzaW5nYCBhdXRvbWF0ZXMsIHdyaXR0ZW4gYnkgaGFuZCB0b2RheToKY29uc3QgcmVzb3VyY2UgPSB7CiAgW1N5bWJvbC5kaXNwb3NlXTogKCkgPT4gY29uc29sZS5sb2coImNsb3NpbmcgZGF0YS50eHQiKQp9OwoKdHJ5IHsKICBjb25zb2xlLmxvZygicmVhZGluZyBkYXRhLnR4dCIpOwogIC8vIC4uLndvcmsgdGhhdCBtaWdodCB0aHJvdy4uLgp9IGZpbmFsbHkgewogIHJlc291cmNlW1N5bWJvbC5kaXNwb3NlXSgpOyAgIC8vIGd1YXJhbnRlZWQgY2xlYW51cCDigJQgdGhpcyBpcyB3aGF0IGB1c2luZ2AgZ2l2ZXMgeW91Cn0=",
"es2026-sum": "aWYgKHR5cGVvZiBNYXRoLnN1bVByZWNpc2UgPT09ICJmdW5jdGlvbiIpIHsKICBjb25zb2xlLmxvZygiTWF0aC5zdW1QcmVjaXNlOiIsIE1hdGguc3VtUHJlY2lzZShbMC4xLCAwLjJdKSk7ICAvLyBleGFjdGx5IDAuMwp9IGVsc2UgewogIGNvbnNvbGUubG9nKCJNYXRoLnN1bVByZWNpc2Ugbm90IGluIHRoaXMgcnVudGltZSB5ZXQgKEVTMjAyNikuIik7Cn0KY29uc29sZS5sb2coIm5haXZlIDAuMSArIDAuMiA9IiwgMC4xICsgMC4yKTsgICAvLyB0aGUgY2xhc3NpYyBmbG9hdGluZy1wb2ludCBzdGluZw==",
"es2026-iserror": "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",
"es2026-base64": "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"
};
function decode(b64){
const bin = atob(b64);
const bytes = Uint8Array.from(bin, c => c.charCodeAt(0));
return new TextDecoder().decode(bytes);
}
let EVAL_OK = true;
try { new Function("return 1")(); } catch (e) { EVAL_OK = false; }
/* ============================================================
SYNTAX HIGHLIGHTER (lightweight tokenizer)
============================================================ */
const KEYWORDS = new Set(("await break case catch class const continue default delete do else export "+
"extends finally for function get if import in instanceof let new of return set static super switch "+
"this throw try typeof using var void while yield async from as").split(" "));
const LITERALS = new Set("true false null undefined NaN Infinity".split(" "));
function esc(s){return s.replace(/&/g,"&").replace(/</g,"<").replace(/>/g,">");}
function highlight(code){
let out="", i=0; const n=code.length;
const reNum=/0[xX][0-9a-fA-F_]+n?|0[bB][01_]+n?|0[oO][0-7_]+n?|\d[\d_]*\.?[\d_]*(?:[eE][+-]?\d+)?n?|\.\d[\d_]*/y;
const reId=/[A-Za-z_$][A-Za-z0-9_$]*/y;
const span=(c,s)=>`<span class="t-${c}">${esc(s)}</span>`;
while(i<n){
const c=code[i], c2=code[i+1];
if(c==="/"&&c2==="/"){let j=i;while(j<n&&code[j]!=="\n")j++;out+=span("com",code.slice(i,j));i=j;continue;}
if(c==="/"&&c2==="*"){let j=i+2;while(j<n&&!(code[j]==="*"&&code[j+1]==="/"))j++;j=Math.min(n,j+2);out+=span("com",code.slice(i,j));i=j;continue;}
if(c==='"'||c==="'"){let j=i+1;while(j<n&&code[j]!==c){if(code[j]==="\\")j++;j++;}j=Math.min(n,j+1);out+=span("str",code.slice(i,j));i=j;continue;}
if(c==="`"){let j=i+1;while(j<n&&code[j]!=="`"){if(code[j]==="\\")j++;j++;}j=Math.min(n,j+1);out+=span("str",code.slice(i,j));i=j;continue;}
if(/[0-9]/.test(c)||(c==="."&&/[0-9]/.test(c2||""))){reNum.lastIndex=i;const mm=reNum.exec(code);if(mm&&mm.index===i){out+=span("num",mm[0]);i+=mm[0].length;continue;}}
if(/[A-Za-z_$]/.test(c)){reId.lastIndex=i;const mm=reId.exec(code);const w=mm[0];let k="pun";
if(KEYWORDS.has(w))k="key";
else if(LITERALS.has(w))k="lit";
else{let j=i+w.length;while(j<n&&/\s/.test(code[j]))j++;
if(code[j]==="(")k="fn";
else if(/^[A-Z]/.test(w))k="type";
else k=null;}
out+= k? span(k,w): esc(w);
i+=w.length;continue;}
out+=esc(c);i++;
}
return out;
}
/* ============================================================
CONSOLE-OUTPUT FORMATTER (mimics console.log)
============================================================ */
function quote(s){return '"'+s.replace(/\\/g,"\\\\").replace(/"/g,'\\"')+'"';}
function inner(v,seen,d){
const t=typeof v;
if(v===null)return"null";
if(t==="undefined")return"undefined";
if(t==="string")return quote(v);
if(t==="bigint")return v+"n";
if(t==="symbol")return v.toString();
if(t==="function")return"[Function: "+(v.name||"anonymous")+"]";
if(t==="number"||t==="boolean")return String(v);
return objFmt(v,seen,d);
}
function objFmt(v,seen,d){
if(seen.has(v))return"[Circular]";
if(d>4)return"…";
seen.add(v);let r;
try{
if(Array.isArray(v)){
r=v.length? "[ "+v.map(x=>inner(x,seen,d+1)).join(", ")+" ]":"[]";
}else if(v instanceof Map){
const p=[];v.forEach((val,k)=>p.push(inner(k,seen,d+1)+" => "+inner(val,seen,d+1)));
r=`Map(${v.size}) {`+(p.length?" "+p.join(", ")+" ":"")+"}";
}else if(v instanceof Set){
const p=[];v.forEach(val=>p.push(inner(val,seen,d+1)));
r=`Set(${v.size}) {`+(p.length?" "+p.join(", ")+" ":"")+"}";
}else if(v instanceof Date){ r=v.toISOString(); }
else if(v instanceof RegExp){ r=v.toString(); }
else if(v instanceof Error){ r=v.name+": "+v.message; }
else{
const keys=Object.keys(v);
const p=keys.map(k=>(/^[A-Za-z_$][\w$]*$/.test(k)?k:quote(k))+": "+inner(v[k],seen,d+1));
const cn=v.constructor&&v.constructor.name&&v.constructor.name!=="Object"?v.constructor.name+" ":"";
r=cn+"{"+(p.length?" "+p.join(", ")+" ":"")+"}";
}
}catch(e){ r="[Unprintable]"; }
seen.delete(v);return r;
}
function fmt(v){ return typeof v==="string"? v : inner(v,new Set(),0); }
/* ============================================================
EXECUTOR — captures console output, supports await
============================================================ */
async function execute(source){
if(!EVAL_OK){ return [{type:"warn",text:"Live execution is blocked in this embedded preview. Open this file in a new browser tab (or download it) to run and edit \u2014 every snippet here is real, runnable code."}]; }
const logs=[];
const mk=type=>(...a)=>logs.push({type,text:a.map(fmt).join(" ")});
const sandbox={log:mk("log"),info:mk("log"),debug:mk("log"),warn:mk("warn"),error:mk("error"),
table:(d)=>logs.push({type:"log",text:fmt(d)})};
try{
const fn=new Function("console","return (async()=>{\n"+source+"\n})()");
const timeout=new Promise((_,rej)=>setTimeout(()=>rej(new Error("(execution timed out)")),3000));
await Promise.race([fn(sandbox),timeout]);
}catch(e){
logs.push({type:"error",text:(e&&e.name?e.name+": "+e.message:String(e))});
}
return logs;
}
function renderOutput(el,logs){
el.classList.add("show");
if(!logs.length){ el.innerHTML='<div class="out-row empty"><span class="gut">›</span>(no console output)</div>'; return; }
el.innerHTML=logs.map(l=>`<div class="out-row ${l.type}"><span class="gut">›</span>${esc(l.text)}</div>`).join("");
}
/* ============================================================
EDITOR (textarea over highlighted <pre>)
============================================================ */
function makeEditor(code){
const wrap=document.createElement("div");wrap.className="editor";
const pre=document.createElement("pre");pre.setAttribute("aria-hidden","true");
const codeEl=document.createElement("code");pre.appendChild(codeEl);
const ta=document.createElement("textarea");
ta.spellcheck=false;ta.setAttribute("autocomplete","off");ta.setAttribute("autocapitalize","off");ta.setAttribute("wrap","off");
ta.value=code;
const paint=()=>{ codeEl.innerHTML=highlight(ta.value)+(ta.value.endsWith("\n")?" ":""); };
const sync=()=>{ pre.scrollTop=ta.scrollTop;pre.scrollLeft=ta.scrollLeft; };
ta.addEventListener("input",paint);
ta.addEventListener("scroll",sync);
ta.addEventListener("keydown",e=>{
if(e.key==="Tab"){e.preventDefault();const s=ta.selectionStart,en=ta.selectionEnd;
ta.value=ta.value.slice(0,s)+" "+ta.value.slice(en);ta.selectionStart=ta.selectionEnd=s+2;paint();}
});
paint();
wrap.appendChild(pre);wrap.appendChild(ta);
return {wrap,ta};
}
/* ============================================================
RENDER
============================================================ */
const railEl=document.getElementById("rail");
const navEl=document.getElementById("nav");
const mainEl=document.getElementById("main");
let activeId=null;
const runners=[]; // {run} for "run all"
ERAS.forEach(era=>{
const tick=document.createElement("button");
tick.className="tick";tick.dataset.id=era.id;
tick.innerHTML=`<span class="yr">${era.yr}</span><span class="ed">${era.ed.split(" ")[0]}</span>`;
tick.onclick=()=>select(era.id,true);
railEl.appendChild(tick);
const ni=document.createElement("button");
ni.className="nav-item";ni.dataset.id=era.id;
ni.innerHTML=`<span class="nyr">${era.yr} · ${era.ed}</span>${era.name}`;
ni.onclick=()=>select(era.id,true);
navEl.appendChild(ni);
});
function select(id,scroll){
if(id===activeId)return;
activeId=id;
const era=ERAS.find(e=>e.id===id);
document.querySelectorAll(".tick").forEach(t=>t.classList.toggle("active",t.dataset.id===id));
document.querySelectorAll(".nav-item").forEach(t=>t.classList.toggle("active",t.dataset.id===id));
const active=document.querySelector(".tick.active");
if(active&&scroll)active.scrollIntoView({inline:"center",block:"nearest",behavior:"smooth"});
history.replaceState(null,"","#"+id);
renderEra(era);
}
function renderEra(era){
runners.length=0;
mainEl.innerHTML="";
const head=document.createElement("div");
head.className="era-head fade";
head.innerHTML=`
<div class="meta">
<span class="big-yr">${era.yr}</span>
<span class="edition">${era.ed}</span>
</div>
<div class="name">${era.name}</div>
<p class="blurb">${era.blurb}</p>
<div class="era-actions"></div>`;
mainEl.appendChild(head);
era.features.forEach(f=>{
try{
const raw=CODE[f.code]; if(!raw) return; const code=decode(raw).trim();
const card=document.createElement("div");card.className="card";
const previewPill=f.illustrative?`<span class="pill preview">syntax preview</span>`:"";
card.innerHTML=`
<div class="card-head">
<div class="ft"><code>${esc(f.ft)}</code>${previewPill}</div>
<div class="desc">${f.desc}</div>
</div>`;
if(f.note)card.insertAdjacentHTML("beforeend",`<div class="note">${f.note}</div>`);
const {wrap,ta}=makeEditor(code);
card.appendChild(wrap);
const bar=document.createElement("div");bar.className="editor-bar";
bar.innerHTML=`<span class="tag">${f.code}.js</span><div class="btns"></div>`;
const btns=bar.querySelector(".btns");
const out=document.createElement("div");out.className="out";
if(f.illustrative){
bar.querySelector(".tag").textContent="not runnable here — read it";
}else{
const reset=document.createElement("button");reset.className="btn";reset.textContent="Reset";
reset.onclick=()=>{ta.value=code;ta.dispatchEvent(new Event("input"));out.classList.remove("show");};
const run=document.createElement("button");run.className="btn run";run.innerHTML="▶ Run";
const doRun=async()=>{run.disabled=true;const logs=await execute(ta.value);renderOutput(out,logs);run.disabled=false;};
run.onclick=doRun;
runners.push(doRun);
ta.addEventListener("keydown",e=>{
if((e.metaKey||e.ctrlKey)&&e.key==="Enter"){e.preventDefault();doRun();}
});
btns.appendChild(reset);btns.appendChild(run);
}
card.appendChild(bar);card.appendChild(out);
mainEl.appendChild(card);
}catch(err){ console.warn("card render failed:",f.code,err); }
});
if(runners.length>1){
const all=document.createElement("button");all.className="btn run";all.innerHTML=`▶ Run all ${runners.length} examples`;
all.onclick=async()=>{all.disabled=true;for(const r of runners)await r();all.disabled=false;};
head.querySelector(".era-actions").appendChild(all);
}
}
if(!EVAL_OK){
const b=document.createElement("div");
b.style.cssText="max-width:1320px;margin:0 auto;padding:12px clamp(16px,4vw,48px);font-family:var(--mono);font-size:12.5px;color:var(--warn);border-bottom:1px solid var(--line);background:rgba(255,203,107,.06)";
b.innerHTML="\u26a0 Live \u201cRun\u201d is disabled in this embedded preview (the sandbox blocks code execution). Use the \u2197 open-in-new-tab / download option to run and edit every snippet for real. All code below is genuine and renders fully.";
document.querySelector(".rail-wrap").after(b);
}
/* theme toggle */
(function(){
var root=document.documentElement, btn=document.getElementById("themeToggle");
var SUN='<svg viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><circle cx="12" cy="12" r="4"/><path d="M12 2v2M12 20v2M4.9 4.9l1.4 1.4M17.7 17.7l1.4 1.4M2 12h2M20 12h2M4.9 19.1l1.4-1.4M17.7 6.3l1.4-1.4"/></svg>';
var MOON='<svg viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><path d="M21 12.8A9 9 0 1 1 11.2 3 7 7 0 0 0 21 12.8z"/></svg>';
function apply(t){ root.setAttribute("data-theme",t); btn.innerHTML = (t==="light"? MOON+"<span>Dark</span>" : SUN+"<span>Light</span>"); }
var theme = root.getAttribute("data-theme")==="light" ? "light":"dark";
apply(theme);
btn.addEventListener("click", function(){ theme = theme==="light"?"dark":"light"; apply(theme); });
})();
// init from hash or default to ES6 (the renaissance — best first impression)
const startId=(location.hash||"").replace("#","");
select(ERAS.some(e=>e.id===startId)?startId:"es2015");
</script>
</body>
</html>