Aleksandr magrega

Format JavaScript Array of Strings to Oxford Comma

const toOxfordComma = (array) =>
  array.length === 2
    ? array.join(' and ')
    : array.length > 2
    ? array
        .slice(0, array.length - 1)
 .concat(`and ${array.slice(-1)}`)

	// Types for the result object with discriminated union
	type Success<T> = {
	data: T;
	error: null;
	};

	type Failure<E> = {
	data: null;
	error: E;
	};