44 lines
1.2 KiB
JavaScript
44 lines
1.2 KiB
JavaScript
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;
|