import { VERSION } from './_setup.js';

// If Underscore is called as a function, it returns a wrapped object that can
// be used OO-style. This wrapper holds altered versions of all functions added
// through `_.mixin`. Wrapped objects may be chained.
export default function _(obj) {
  if (obj instanceof _) return obj;
  if (!(this instanceof _)) return new _(obj);
  this._wrapped = obj;
}

_.VERSION = VERSION;

// Extracts the result from a wrapped and chained object.
_.prototype.value = function() {
  return this._wrapped;
};

// Provide unwrapping proxies for some methods used in engine operations
// such as arithmetic and JSON stringification.
_.prototype.valueOf = _.prototype.toJSON = _.prototype.value;

_.prototype.toString = function() {
  return String(this._wrapped);
};