add: 最大数和最小数

test/array/maximum-and-minimum.test.js

@@ -0,0 +1,11 @@
+import { maxAndMin } from '../../src/array/maximum-and-minimum'
+
+test('最大数和最小数', () => {
+  expect(maxAndMin([
+    [1, 2, 3],
+    [4, 3, 2],
+    [6, 4, 4]
+  ])).toEqual([6, 1])
+
+  expect(maxAndMin([])).toEqual([])
+})