Mtandao wa WPM0
WP Engine0
Usahihi100%
Waliozaliwa0s
Muda wa muda—
Majina ya wahusika0
Kutokuwa sahihi0
Makosa ya0
Maendeleo ya Maendeleo0%
Caps Lock juu ya
Mwongozo wa haraka
- Lugha ya programu
- TypeScript
- Ugumu wa ugumu
- Wastani wa kati
Return the first element while preserving its type.
function firstItem<T>(items: T[]): T | undefined {
return items[0];
}
const firstNumber = firstItem([4, 8, 15]);
const firstName = firstItem(["Ada", "Lin"]);