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var baseToString = require('../internal/baseToString');
/** Used to generate unique IDs. */
var idCounter = 0;
/**
* Generates a unique ID. If `prefix` is provided the ID is appended to it.
*
* @static
* @memberOf _
* @category Utility
* @param {string} [prefix] The value to prefix the ID with.
* @returns {string} Returns the unique ID.
* @example
*
* _.uniqueId('contact_');
* // => 'contact_104'
*
* _.uniqueId();
* // => '105'
*/
function uniqueId(prefix) {
var id = ++idCounter;
return baseToString(prefix) + id;
}
module.exports = uniqueId;
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