40 lines
1017 B
JavaScript
40 lines
1017 B
JavaScript
|
var baseClamp = require('./_baseClamp'),
|
||
|
|
baseToString = require('./_baseToString'),
|
||
|
|
toInteger = require('./toInteger'),
|
||
|
|
toString = require('./toString');
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Checks if `string` starts with the given target string.
|
||
|
|
*
|
||
|
|
* @static
|
||
|
|
* @memberOf _
|
||
|
|
* @since 3.0.0
|
||
|
|
* @category String
|
||
|
|
* @param {string} [string=''] The string to inspect.
|
||
|
|
* @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 = toString(string);
|
||
|
|
position = position == null
|
||
|
|
? 0
|
||
|
|
: baseClamp(toInteger(position), 0, string.length);
|
||
|
|
|
||
|
|
target = baseToString(target);
|
||
|
|
return string.slice(position, position + target.length) == target;
|
||
|
|
}
|
||
|
|
|
||
|
|
module.exports = startsWith;
|