| /*! |
| * repeat-string <https://github.com/jonschlinkert/repeat-string> |
| * |
| * Copyright (c) 2014-2015, Jon Schlinkert. |
| * Licensed under the MIT License. |
| */ |
| |
| 'use strict'; |
| |
| /** |
| * Results cache |
| */ |
| |
| var res = ''; |
| var cache; |
| |
| /** |
| * Expose `repeat` |
| */ |
| |
| module.exports = repeat; |
| |
| /** |
| * Repeat the given `string` the specified `number` |
| * of times. |
| * |
| * **Example:** |
| * |
| * ```js |
| * var repeat = require('repeat-string'); |
| * repeat('A', 5); |
| * //=> AAAAA |
| * ``` |
| * |
| * @param {String} `string` The string to repeat |
| * @param {Number} `number` The number of times to repeat the string |
| * @return {String} Repeated string |
| * @api public |
| */ |
| |
| function repeat(str, num) { |
| if (typeof str !== 'string') { |
| throw new TypeError('expected a string'); |
| } |
| |
| // cover common, quick use cases |
| if (num === 1) return str; |
| if (num === 2) return str + str; |
| |
| var max = str.length * num; |
| if (cache !== str || typeof cache === 'undefined') { |
| cache = str; |
| res = ''; |
| } else if (res.length >= max) { |
| return res.substr(0, max); |
| } |
| |
| while (max > res.length && num > 1) { |
| if (num & 1) { |
| res += str; |
| } |
| |
| num >>= 1; |
| str += str; |
| } |
| |
| res += str; |
| res = res.substr(0, max); |
| return res; |
| } |