Memos adalah computed value yang di-cache — hanya dihitung ulang saat dependency berubah.

createMemo

import { createSignal, createMemo } from "solid-js"

function App() {
  const [count, setCount] = createSignal(0)
  const doubled = createMemo(() => count() * 2)
  const isEven = createMemo(() => count() % 2 === 0)

  return (
    <div>
      <p>{count()} x 2 = {doubled()}</p>
      <p>{isEven() ? "Genap" : "Ganjil"}</p>
    </div>
  )
}

Kapan Pakai Memo?

• Signal — state yang bisa diubah
• Memo — derived/computed value (read-only)
• Effect — side effect (DOM, fetch, logging)