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1 | /*!
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2 | * repeat-string <https://github.com/jonschlinkert/repeat-string>
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3 | *
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4 | * Copyright (c) 2014-2015, Jon Schlinkert.
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5 | * Licensed under the MIT License.
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6 | */
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7 |
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8 | 'use strict';
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9 |
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10 | /**
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11 | * Results cache
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12 | */
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13 |
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14 | var res = '';
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15 | var cache;
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16 |
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17 | /**
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18 | * Expose `repeat`
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19 | */
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20 |
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21 | module.exports = repeat;
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22 |
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23 | /**
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24 | * Repeat the given `string` the specified `number`
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25 | * of times.
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26 | *
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27 | * **Example:**
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28 | *
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29 | * ```js
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30 | * var repeat = require('repeat-string');
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31 | * repeat('A', 5);
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32 | * //=> AAAAA
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33 | * ```
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34 | *
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35 | * @param {String} `string` The string to repeat
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36 | * @param {Number} `number` The number of times to repeat the string
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37 | * @return {String} Repeated string
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38 | * @api public
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39 | */
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40 |
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41 | function repeat(str, num) {
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42 | if (typeof str !== 'string') {
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43 | throw new TypeError('expected a string');
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44 | }
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45 |
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46 | // cover common, quick use cases
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47 | if (num === 1) return str;
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48 | if (num === 2) return str + str;
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49 |
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50 | var max = str.length * num;
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51 | if (cache !== str || typeof cache === 'undefined') {
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52 | cache = str;
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53 | res = '';
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54 | } else if (res.length >= max) {
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55 | return res.substr(0, max);
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56 | }
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57 |
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58 | while (max > res.length && num > 1) {
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59 | if (num & 1) {
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60 | res += str;
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61 | }
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62 |
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63 | num >>= 1;
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64 | str += str;
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65 | }
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66 |
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67 | res += str;
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68 | res = res.substr(0, max);
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69 | return res;
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70 | }
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