feat: add range

src/index.ts

@@ -49,6 +49,7 @@ export { default as parseCssValue } from './parseCssValue'
 export { default as pick } from './pick'
 export { default as preventEventDefault } from './preventEventDefault'
 export { default as randomString } from './randomString'
+export { default as range } from './range'
 export { default as reduce } from './reduce'
 export { default as repeat } from './repeat'
 export { default as request } from './request'

src/range.ts

@@ -0,0 +1,27 @@
+/**
+ * 创建一个包含从 start 到 end，但不包含 end 本身范围数字的数组。
+ *
+ * @param start 开始数字
+ * @param [end] 结束数字
+ * @param [step] 步进值
+ * @returns 开始到结束范围内数字组成的数组
+ */
+export default function range(start: number, end?: number, step?: number): number[] {
+  if (arguments.length === 1) {
+    if (start > 0) {
+      end = start
+      start = 0
+    } else {
+      end = 0
+    }
+    step = 1
+  } else {
+    step = step == null ? 1 : step
+  }
+  const result: number[] = []
+  while (start < end) {
+    result.push(start)
+    start += step
+  }
+  return result
+}

test/index.test.ts

@@ -1271,3 +1271,12 @@ describe('set', () => {
     })
   })
 })
+
+describe('range', () => {
+  test('ok', () => {
+    expect(vtils.range(2)).toEqual([0, 1])
+    expect(vtils.range(2, 5)).toEqual([2, 3, 4])
+    expect(vtils.range(5, 10, 2)).toEqual([5, 7, 9])
+    expect(vtils.range(-3)).toEqual([-3, -2, -1])
+  })
+})