dir01 · May 14, 2019 09:33
diff --git a/flatten.spec.ts b/flatten.spec.ts
 const flatten = <T>(arr: T[][]): T[] => ([] as T[]).concat(...arr);

 test("flatten", () => {
  expect(flatten([[1], [2], [3, 4]])).toEqual([1, 2, 3, 4]);
 });
	const flatten = <T>(arr: T[][]): T[] => ([] as T[]).concat(...arr);

	test("flatten", () => {
	expect(flatten([[1], [2], [3, 4]])).toEqual([1, 2, 3, 4]);
	});