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var baseToString = require('./_baseToString'),    castSlice = require('./_castSlice'),    charsEndIndex = require('./_charsEndIndex'),    charsStartIndex = require('./_charsStartIndex'),    stringToArray = require('./_stringToArray'),    toString = require('./toString');
/** Used to match leading and trailing whitespace. */var reTrim = /^\s+|\s+$/g;
/** * Removes leading and trailing whitespace or specified characters from `string`. * * @static * @memberOf _ * @since 3.0.0 * @category String * @param {string} [string=''] The string to trim. * @param {string} [chars=whitespace] The characters to trim. * @param- {Object} [guard] Enables use as an iteratee for methods like `_.map`. * @returns {string} Returns the trimmed string. * @example * * _.trim('  abc  '); * // => 'abc' * * _.trim('-_-abc-_-', '_-'); * // => 'abc' * * _.map(['  foo  ', '  bar  '], _.trim); * // => ['foo', 'bar'] */function trim(string, chars, guard) {  string = toString(string);  if (string && (guard || chars === undefined)) {    return string.replace(reTrim, '');  }  if (!string || !(chars = baseToString(chars))) {    return string;  }  var strSymbols = stringToArray(string),      chrSymbols = stringToArray(chars),      start = charsStartIndex(strSymbols, chrSymbols),      end = charsEndIndex(strSymbols, chrSymbols) + 1;
  return castSlice(strSymbols, start, end).join('');}
module.exports = trim;