Function nullMap

shared/src/utility.ts:33–38

(t: T | null, f: (_: T) => R)

}

export function nullMap<T, R>(t: T | null, f: (_: T) => R): R | null {
	if (t === null) {
		return t as null
	}
	return f(t)
}

// https://stackoverflow.com/a/65666402
// If you update this function, also update `./utility.workerd.ts`!