You cannot select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
37 lines
974 B
JavaScript
37 lines
974 B
JavaScript
var baseToString = require('../internal/baseToString');
|
|
|
|
/* Native method references for those with the same name as other `lodash` methods. */
|
|
var nativeMin = Math.min;
|
|
|
|
/**
|
|
* Checks if `string` starts with the given target string.
|
|
*
|
|
* @static
|
|
* @memberOf _
|
|
* @category String
|
|
* @param {string} [string=''] The string to search.
|
|
* @param {string} [target] The string to search for.
|
|
* @param {number} [position=0] The position to search from.
|
|
* @returns {boolean} Returns `true` if `string` starts with `target`, else `false`.
|
|
* @example
|
|
*
|
|
* _.startsWith('abc', 'a');
|
|
* // => true
|
|
*
|
|
* _.startsWith('abc', 'b');
|
|
* // => false
|
|
*
|
|
* _.startsWith('abc', 'b', 1);
|
|
* // => true
|
|
*/
|
|
function startsWith(string, target, position) {
|
|
string = baseToString(string);
|
|
position = position == null
|
|
? 0
|
|
: nativeMin(position < 0 ? 0 : (+position || 0), string.length);
|
|
|
|
return string.lastIndexOf(target, position) == position;
|
|
}
|
|
|
|
module.exports = startsWith;
|