Last change
on this file since fa375fe was 6a3a178, checked in by Ema <ema_spirova@…>, 3 years ago |
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[6a3a178] | 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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