feat: new function - fenToYuan

README.md

@@ -119,6 +119,7 @@ pnpm add @utopia-utils/dom
 * base64ToFile: base64 转 File, 如图片裁剪时，我们获取到的是 base64，但上传接口一般需要 formData 上传。[source](https://github.com/GreatAuk/utopia-utils/blob/main/packages/core/src/base64ToFile.ts)
 * toBase64: 将 File | Blob | imgUrl 转 base64。[source](https://github.com/GreatAuk/utopia-utils/blob/main/packages/core/src/toBase64.ts)
 * yuanToFen: 人民币：元转分。[source](https://github.com/GreatAuk/utopia-utils/blob/main/packages/core/src/yuanToFen.ts)
+* fenToYuan: 人民币：分转元。[source](https://github.com/GreatAuk/utopia-utils/blob/main/packages/core/src/fenToYuan.ts)
 ### 类型判断
 
 ```bash

packages/core/src/fenToYuan.test.ts

@@ -0,0 +1,37 @@
+import { afterEach, describe, expect, it, vi } from 'vitest'
+
+import { fenToYuan } from './fenToYuan'
+
+describe('fenToYuan', () => {
+  afterEach(() => {
+    vi.resetAllMocks()
+  })
+  it('should return undefined when input is not number', () => {
+    expect(fenToYuan(null as any)).toBe(undefined)
+    expect(fenToYuan(undefined as any)).toBe(undefined)
+    expect(fenToYuan('' as any)).toBe(undefined)
+    expect(fenToYuan('abc' as any)).toBe(undefined)
+    expect(fenToYuan({} as any)).toBe(undefined)
+    expect(fenToYuan([] as any)).toBe(undefined)
+    expect(fenToYuan(true as any)).toBe(undefined)
+    expect(fenToYuan(false as any)).toBe(undefined)
+    expect(fenToYuan(NaN as any)).toBe(undefined)
+  })
+  it('happy path', () => {
+    expect(fenToYuan(0)).toBe(0)
+    expect(fenToYuan(1)).toBe(0.01)
+    expect(fenToYuan(100)).toBe(1)
+    expect(fenToYuan(1000)).toBe(10)
+    expect(fenToYuan(99)).toBe(0.99)
+    expect(fenToYuan(10000)).toBe(100)
+    expect(fenToYuan(100000)).toBe(1000)
+    expect(fenToYuan(1000000000000000000)).toBe(10000000000000000)
+    expect(fenToYuan(10000000000000000000)).toBe(100000000000000000)
+  })
+  it('should return null if throw error', () => {
+    vi.spyOn(Number, 'isNaN').mockImplementation(() => {
+      throw new Error('mock error')
+    })
+    expect(fenToYuan(100)).toBe(undefined)
+  })
+})

packages/core/src/fenToYuan.ts

@@ -0,0 +1,19 @@
+import { divide } from 'number-precision'
+import { isNumber } from '@utopia-utils/share'
+
+/**
+ * 金额￥ 分转元
+ * @param fen 分
+ * @returns 元, 如果输入不是数字，则返回 undefined
+ * */
+export function fenToYuan(fen: number | undefined): number | undefined {
+  try {
+    if (!isNumber(fen) || Number.isNaN(fen))
+      return undefined
+    return divide(fen, 100)
+  }
+  catch (err) {
+    console.error(err)
+    return undefined
+  }
+}