`Intl` is available in modern React Native and is the right tool for formatting currency, numbers and dates correctly per locale, rather than hand-rolling string concatenation.
function formatUsd(amount: number, locale = "en-US") {
return new Intl.NumberFormat(locale, { style: "currency", currency: "USD" }).format(amount);
}
formatUsd(1234.5); // "$1,234.50"Token amounts often need custom formatting beyond `Intl` (e.g. showing 18-decimal precision truncated sensibly), so a dedicated `formatTokenAmount` helper alongside `Intl` is common.