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58 lines
1.5 KiB
JavaScript
58 lines
1.5 KiB
JavaScript
/**
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* lodash 3.0.0 (Custom Build) <https://lodash.com/>
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* Build: `lodash modern modularize exports="npm" -o ./`
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* Copyright 2012-2015 The Dojo Foundation <http://dojofoundation.org/>
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* Based on Underscore.js 1.7.0 <http://underscorejs.org/LICENSE>
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* Copyright 2009-2015 Jeremy Ashkenas, DocumentCloud and Investigative Reporters & Editors
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* Available under MIT license <https://lodash.com/license>
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*/
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var baseToString = require('lodash._basetostring');
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/** Native method references. */
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var floor = Math.floor;
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/* Native method references for those with the same name as other `lodash` methods. */
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var nativeIsFinite = global.isFinite;
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/**
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* Repeats the given string `n` times.
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*
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* @static
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* @memberOf _
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* @category String
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* @param {string} [string=''] The string to repeat.
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* @param {number} [n=0] The number of times to repeat the string.
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* @returns {string} Returns the repeated string.
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* @example
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*
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* _.repeat('*', 3);
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* // => '***'
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*
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* _.repeat('abc', 2);
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* // => 'abcabc'
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*
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* _.repeat('abc', 0);
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* // => ''
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*/
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function repeat(string, n) {
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var result = '';
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string = baseToString(string);
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n = +n;
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if (n < 1 || !string || !nativeIsFinite(n)) {
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return result;
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}
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// Leverage the exponentiation by squaring algorithm for a faster repeat.
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// See https://en.wikipedia.org/wiki/Exponentiation_by_squaring for more details.
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do {
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if (n % 2) {
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result += string;
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}
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n = floor(n / 2);
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string += string;
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} while (n);
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return result;
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}
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module.exports = repeat;
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