HORIZON PROJECT

var toString = require('./toString');

/** Used to generate unique IDs. */

var idCounter = 0;

/**

 * Generates a unique ID. If `prefix` is given, the ID is appended to it.

 *

 * @static

 * @since 0.1.0

 * @memberOf _

 * @category Util

 * @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 toString(prefix) + id;

}

module.exports = uniqueId;