mirror of https://github.com/lukechilds/node.git
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
42 lines
1.1 KiB
42 lines
1.1 KiB
var 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 _
|
|
* @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 functions 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) {
|
|
return string;
|
|
}
|
|
if (guard || chars === undefined) {
|
|
return string.replace(reTrimStart, '');
|
|
}
|
|
chars = (chars + '');
|
|
if (!chars) {
|
|
return string;
|
|
}
|
|
var strSymbols = stringToArray(string);
|
|
return strSymbols.slice(charsStartIndex(strSymbols, stringToArray(chars))).join('');
|
|
}
|
|
|
|
module.exports = trimStart;
|
|
|