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