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- var baseToString = require('./_baseToString'),
- castSlice = require('./_castSlice'),
- charsStartIndex = require('./_charsStartIndex'),
- stringToArray = require('./_stringToArray'),
- toString = require('./toString');
- /** Used to match leading whitespace. */
- var reTrimStart = /^\s+/;
- /**
- * Removes leading whitespace or specified characters from `string`.
- *
- * @static
- * @memberOf _
- * @since 4.0.0
- * @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
- *
- * _.trimStart(' abc ');
- * // => 'abc '
- *
- * _.trimStart('-_-abc-_-', '_-');
- * // => 'abc-_-'
- */
- function trimStart(string, chars, guard) {
- string = toString(string);
- if (string && (guard || chars === undefined)) {
- return string.replace(reTrimStart, '');
- }
- if (!string || !(chars = baseToString(chars))) {
- return string;
- }
- var strSymbols = stringToArray(string),
- start = charsStartIndex(strSymbols, stringToArray(chars));
- return castSlice(strSymbols, start).join('');
- }
- module.exports = trimStart;
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