add yd_math_max 函数

ForeverGuo · Aug 12, 2024 · a2534d3 · a2534d3
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diff --git a/lib/math/max.js b/lib/math/max.js
@@ -0,0 +1,20 @@
+/**
+ * @description 返回array中最大值，如果为空或假值，则返回undefined
+ * @author grantguo <https://github.com/ForeverGuo>
+ * @category math
+ * @alias yd_math_max
+ * @param { Array } array
+ * @return 返回array中最大值
+ * @summary 返回array中最大值
+ * @example
+ * yd_math_max([1, 2, 3, 4]);
+ * // => 4
+ * yd_math_max([]);
+ * // => undefined
+ *
+ */
+
+export default (array) => {
+    if (array.length === 0) return undefined;
+    return Math.max(...array);
+};
diff --git a/lib/math/max.test.js b/lib/math/max.test.js
@@ -0,0 +1,12 @@
+import { describe, it, expect } from 'vitest';
+import yd_math_max from './max.js';
+
+describe('yd_math_max', () => {
+    it('it shoule return a number', () => {
+        const arr = [1, 2, 3, 4];
+        const number_1 = yd_math_max(arr);
+        expect(number_1).toEqual(4);
+        const number_2 = yd_math_max([]);
+        expect(number_2).toEqual(undefined);
+    });
+});