Ramonda

Examples

Each one is a real component, running on this page. The source under it is printed from the same file that renders above it, so what you read is what you are looking at.

State and a handler

@compute — derived values, cached

  • apples — 3
  • bread — 2
  • coffee — 9

total: 14total computed 1× · visible computed 1× — typing in the filter recomputes only one of them

@created, @mounted, @destroyed — in order

    @Host — the element a component is

    I am a <section>
    I have the default host.

    Inspect the elements: the first is a real <section>, the second is <ramonda-host>.

    Refs — reaching the element

    0 characters

    @onWindow — a global listener

    window is 0px wideresize the browser

    @onDocument — a keyboard shortcut

    last key: pressed 0 times — type anywhere on the page

    @timeout — cancelled on unmount

    waiting 1.5 seconds…

    Timeout — started by a click, cleared by teardown

    nothing started

    @interval — and the two-pass pattern

    updates every second

    Cleanup — what a subscription returns

      @watchProp — reacting to a prop

      showing adano change yet — @watchProp does not fire on mount

      Context — a value without threading

      a component two levels down:light / pink

      @memoized — stable handler identity

      • apples
      • bread
      • coffee

      createSubscriptionDecorator — external stores

      0

      store listeners: 0 — unmounting the component removes its subscription, with nothing in the component to remember it

      ErrorBoundary — containing a failure

      this row is outside the boundary

      Fragile is fine.

      @persist — a value from the server

      prerendered at 2026-08-21 20:18:04 UTCclient @created ran 0 time(s) — the value above came from the server

      list() — lists without keys

      click a few counters, then reverse — each count moves with its task

      • write the docs
      • fix the diff
      • ship it

      list() — a filtered, conditional list

      star a row, then filter — a row that stays keeps its own star, and no row inherits one from a person the filter removed

      • Ada compilers
      • Grace runtimes
      • Edsger semantics
      • Barbara genomics
      • Katherine trajectories

      focusOn — what an immutable edit copies

      last: nothing yet

        Only what is ON the path gets a new object. `state.users` and `state.posts[0]` come out of every edit as the very same objects, so a shallow compare rejects those branches without looking inside them — which is what makes the diff cheap. Write a value that is already there and nothing is copied at all, not even the root.

        Navigator — the live route of this site

        pathname/examples

        searchParams(none)

        → State→ Lists→ back here, with a query

        Reads are per key: a component reading only pathname is not re-rendered when the query changes.

        Query — one request per key, cached

        Ada Lovelace1843 followers

        requests made: 1 — switch back to someone you already viewed and it stays put

        Mutation — optimistic, with rollback

        • write the docs

        try adding "write the docs" twice to see the rollback

        Inheritance — the unit of reuse

        three classes, one render() between them — the third is a <mark>

        AsyncLoad — a component in its own chunk

        open the network tab — the chunk is preloaded from <head> and fetched once

        Loaded at 8:18:04 PM.fetched on demand

        Form — fields, validation and array rows

        Tags

        valid false · dirty false · submits 0