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var 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) {
return string;
}
if (guard || chars === undefined) {
return string.replace(reTrim, '');
}
chars = (chars + '');
if (!chars) {
return string;
}
var strSymbols = stringToArray(string),
chrSymbols = stringToArray(chars);
return strSymbols
.slice(charsStartIndex(strSymbols, chrSymbols), charsEndIndex(strSymbols, chrSymbols) + 1)
.join('');
}
module.exports = trim;
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