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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;