import { NotFoundException } from "@/exception/not-found-exception.ts";
import { InvalidResponseException } from "@/exception/invalid-response-exception.ts";

export function single<T>(list: T[]): T {
    if (list.length === 1) {
        return list[0];
    } else if (list.length === 0) {
        throw new NotFoundException("Expected list with exactly one element, but got an empty list.");
    } else {
        throw new InvalidResponseException(
            `Expected list with exactly one element, but got one with ${list.length} elements.`,
        );
    }
}