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Foundations · easy

4. Props and composition

Passing data down and composing small components.

1 min read3 questionsup to 50 XPtopic 4/50

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Components receive data through `props`, exactly like React on the web. Typing them with TypeScript catches mistakes before runtime — critical when a prop is a wallet address or a token amount.

type BalanceProps = { symbol: string; amount: number };

function Balance({ symbol, amount }: BalanceProps) {
  return <Text>{amount.toFixed(4)} {symbol}</Text>;
}

function Portfolio() {
  return (
    <View>
      <Balance symbol="ETH" amount={1.2345} />
      <Balance symbol="USDC" amount={500} />
    </View>
  );
}

Favor small, focused components (a `TokenRow`, a `WalletHeader`) over one giant screen component — it makes testing and reuse far easier.

How to study this topic

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  2. 2. Re-read the code snippets and say out loud what each line does.
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Check your understanding

  1. 1. How is data passed from a parent to a child component?

  2. 2. Why type props with TypeScript?

  3. 3. What is a benefit of small, focused components?

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