1var baseToString = require('./_baseToString'), 2 castSlice = require('./_castSlice'), 3 charsEndIndex = require('./_charsEndIndex'), 4 charsStartIndex = require('./_charsStartIndex'), 5 stringToArray = require('./_stringToArray'), 6 toString = require('./toString'); 7 8/** Used to match leading and trailing whitespace. */ 9var reTrim = /^\s+|\s+$/g; 10 11/** 12 * Removes leading and trailing whitespace or specified characters from `string`. 13 * 14 * @static 15 * @memberOf _ 16 * @since 3.0.0 17 * @category String 18 * @param {string} [string=''] The string to trim. 19 * @param {string} [chars=whitespace] The characters to trim. 20 * @param- {Object} [guard] Enables use as an iteratee for methods like `_.map`. 21 * @returns {string} Returns the trimmed string. 22 * @example 23 * 24 * _.trim(' abc '); 25 * // => 'abc' 26 * 27 * _.trim('-_-abc-_-', '_-'); 28 * // => 'abc' 29 * 30 * _.map([' foo ', ' bar '], _.trim); 31 * // => ['foo', 'bar'] 32 */ 33function trim(string, chars, guard) { 34 string = toString(string); 35 if (string && (guard || chars === undefined)) { 36 return string.replace(reTrim, ''); 37 } 38 if (!string || !(chars = baseToString(chars))) { 39 return string; 40 } 41 var strSymbols = stringToArray(string), 42 chrSymbols = stringToArray(chars), 43 start = charsStartIndex(strSymbols, chrSymbols), 44 end = charsEndIndex(strSymbols, chrSymbols) + 1; 45 46 return castSlice(strSymbols, start, end).join(''); 47} 48 49module.exports = trim; 50