| var baseToString = require('./_baseToString'), |
| castSlice = require('./_castSlice'), |
| charsStartIndex = require('./_charsStartIndex'), |
| stringToArray = require('./_stringToArray'), |
| toString = require('./toString'); |
| |
| /** Used to match leading and trailing 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; |