feat: add repeat, base64

src/base64Decode.ts

@@ -0,0 +1,15 @@
+/**
+ * 返回 base64 解码后的字符串。
+ *
+ * @param str 要解码的字符串
+ * @returns 解码后的字符串
+ * @see https://developer.mozilla.org/en-US/docs/Web/API/WindowBase64/Base64_encoding_and_decoding#The_Unicode_Problem#Solution_1_%E2%80%93_escaping_the_string_before_encoding_it
+ */
+export default function base64Decode(str: string): string {
+  return decodeURIComponent(
+    atob(str)
+      .split('')
+      .map(c => '%' + ('00' + c.charCodeAt(0).toString(16)).slice(-2)) // tslint:disable-line
+      .join('')
+  )
+}

src/base64Encode.ts

@@ -0,0 +1,18 @@
+/**
+ * 返回 base64 编码后的字符串。
+ *
+ * @param str 要编码的字符串
+ * @returns 编码后的字符串
+ * @see https://developer.mozilla.org/en-US/docs/Web/API/WindowBase64/Base64_encoding_and_decoding#The_Unicode_Problem#Solution_1_%E2%80%93_escaping_the_string_before_encoding_it
+ */
+export default function base64Encode(str: string | number): string {
+  return btoa(
+    encodeURIComponent(str as string)
+      .replace(
+        /%([0-9A-F]{2})/g,
+        function toSolidBytes(match, p1) {
+          return String.fromCharCode(`0x${p1}` as any)
+        }
+      )
+  )
+}

src/base64UrlDecode.ts

@@ -0,0 +1,17 @@
+import base64Decode from './base64Decode'
+import repeat from './repeat'
+
+/**
+ * 返回 base64url 解码后的字符串。
+ *
+ * @param str 要解码的字符串
+ * @returns 解码后的字符串
+ * @see http://www.ietf.org/rfc/rfc4648.txt
+ */
+export default function base64UrlDecode(str: string): string {
+  const remainder = str.length % 4
+  if (str !== '' && remainder > 0) {
+    str += repeat('=', 4 - remainder)
+  }
+  return base64Decode(str.replace(/-/g, '+').replace(/_/g, '/'))
+}

src/base64UrlEncode.ts

@@ -0,0 +1,15 @@
+import base64Encode from './base64Encode'
+
+/**
+ * 返回 base64url 编码后的字符串。
+ *
+ * @param str 要编码的字符串
+ * @returns 编码后的字符串
+ * @see http://www.ietf.org/rfc/rfc4648.txt
+ */
+export default function base64UrlEncode(str: string | number): string {
+  return base64Encode(str)
+    .replace(/\+/g, '-')
+    .replace(/\//g, '_')
+    .replace(/=+$/, '')
+}

src/index.ts

@@ -1,3 +1,7 @@
+export { default as base64Decode } from './base64Decode'
+export { default as base64Encode } from './base64Encode'
+export { default as base64UrlDecode } from './base64UrlDecode'
+export { default as base64UrlEncode } from './base64UrlEncode'
 export { default as bindEvent } from './bindEvent'
 export { default as castArray } from './castArray'
 export { default as clamp } from './clamp'
@@ -6,3 +10,4 @@ export { default as inBrowser } from './inBrowser'
 export { default as isFunction } from './isFunction'
 export { default as noop } from './noop'
 export { default as reduce } from './reduce'
+export { default as repeat } from './repeat'

src/repeat.ts

@@ -0,0 +1,15 @@
+/**
+ * 重复 N 次给定字符串。
+ *
+ * @param str 要重复的字符串
+ * @param [n=1] 重复的次数
+ * @returns 结果字符串
+ */
+export default function repeat(str: string | number, n: number = 1) {
+  n = Math.round(n <= 0 ? 1 : n)
+  let result = ''
+  while (n--) {
+    result += str
+  }
+  return result
+}

test/index.test.ts

@@ -101,3 +101,63 @@ describe('isFunction', () => {
     expect(vtils.isFunction(null)).toBeFalsy()
   })
 })
+
+describe('repeat', () => {
+  test('空字符串', () => {
+    expect(vtils.repeat('')).toBe('')
+    expect(vtils.repeat('', 20)).toBe('')
+  })
+  test('字符串', () => {
+    expect(vtils.repeat('我们')).toBe('我们')
+    expect(vtils.repeat('我们', 2)).toBe('我们我们')
+  })
+  test('数字', () => {
+    expect(vtils.repeat(1)).toBe('1')
+    expect(vtils.repeat(1, 2)).toBe('11')
+  })
+  test('负数、0、1', () => {
+    expect(vtils.repeat(1, -1)).toBe('1')
+    expect(vtils.repeat('我们', -2)).toBe('我们')
+    expect(vtils.repeat(1, 0)).toBe('1')
+    expect(vtils.repeat('我们', 0)).toBe('我们')
+    expect(vtils.repeat(1, 1)).toBe('1')
+    expect(vtils.repeat('我们', 1)).toBe('我们')
+  })
+})
+
+describe('base64', () => {
+  const data: Array<[string | number, string, string]> = [
+    ['', '', ''],
+    ['v', 'dg==', 'dg'],
+    ['vtils', 'dnRpbHM=', 'dnRpbHM'],
+    ['vtils.base64Encode', 'dnRpbHMuYmFzZTY0RW5jb2Rl', 'dnRpbHMuYmFzZTY0RW5jb2Rl'],
+    ['JavaScript 工具库', 'SmF2YVNjcmlwdCDlt6XlhbflupM=', 'SmF2YVNjcmlwdCDlt6XlhbflupM'],
+    ['JavaScript\n工具库', 'SmF2YVNjcmlwdArlt6XlhbflupM=', 'SmF2YVNjcmlwdArlt6XlhbflupM'],
+    ['\0', 'AA==', 'AA'],
+    [1, 'MQ==', 'MQ'],
+    [-1, 'LTE=', 'LTE'],
+    ['abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789!@#0^&*();:<>,. []{}', 'YWJjZGVmZ2hpamtsbW5vcHFyc3R1dnd4eXpBQkNERUZHSElKS0xNTk9QUVJTVFVWV1hZWjAxMjM0NTY3ODkhQCMwXiYqKCk7Ojw+LC4gW117fQ==', 'YWJjZGVmZ2hpamtsbW5vcHFyc3R1dnd4eXpBQkNERUZHSElKS0xNTk9QUVJTVFVWV1hZWjAxMjM0NTY3ODkhQCMwXiYqKCk7Ojw-LC4gW117fQ'],
+    ['😁😎=-#@`.,?/|{*+😁', '8J+YgfCfmI49LSNAYC4sPy98eyor8J+YgQ==', '8J-YgfCfmI49LSNAYC4sPy98eyor8J-YgQ'],
+    ['❥(ゝω・✿ฺ)※▓●²♠⑲Ⅲ∵molÇùㄡεətsフぽㅚ㉢д╢┉(๑╹◡╹)ﾉ"""', '4p2lKOOCnc+J44O74py/4Li6KeKAu+KWk+KXj8Ky4pmg4pGy4oWi4oi1bW9sw4fDueOEoc61yZl0c+ODleOBveOFmuOJotC04pWi4pSJKOC5keKVueKXoeKVuSnvvokiIiI=', '4p2lKOOCnc-J44O74py_4Li6KeKAu-KWk-KXj8Ky4pmg4pGy4oWi4oi1bW9sw4fDueOEoc61yZl0c-ODleOBveOFmuOJotC04pWi4pSJKOC5keKVueKXoeKVuSnvvokiIiI']
+  ]
+  test('encode', () => {
+    data.forEach(([str, encodedStr]) => {
+      expect(vtils.base64Encode(str)).toBe(encodedStr)
+    })
+  })
+  test('decode', () => {
+    data.forEach(([str, encodedStr]) => {
+      expect(vtils.base64Decode(encodedStr)).toBe(String(str))
+    })
+  })
+  test('url encode', () => {
+    data.forEach(([str, encodedStr, encodedUrlStr]) => {
+      expect(vtils.base64UrlEncode(str)).toBe(encodedUrlStr)
+    })
+  })
+  test('url decode', () => {
+    data.forEach(([str, encodedStr, encodedUrlStr]) => {
+      expect(vtils.base64UrlDecode(encodedUrlStr)).toBe(String(str))
+    })
+  })
+})