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