import baseToString from './_baseToString.js'; import castSlice from './_castSlice.js'; import charsStartIndex from './_charsStartIndex.js'; import stringToArray from './_stringToArray.js'; import toString from './toString.js'; /** 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(''); } export default trimStart;