reheat/lib/support/extend.js

A red hot Node.js ORM for RethinkDB.

module.exports = function (utils) {
  return function extend(protoProps, staticProps) {
    var parent = this;
    var child = function () {
      return parent.apply(this, arguments);
    };

    // Add static properties to the constructor function, if supplied.
    utils.deepMixIn(child, parent, staticProps);

    // Set the prototype chain to inherit from `parent`, without calling
    // `parent`'s constructor function.
    var Surrogate = function () {
      this.constructor = child;
    };
    Surrogate.prototype = parent.prototype;
    child.prototype = new Surrogate();

    // Add prototype properties (instance properties) to the subclass,
    // if supplied.
    if (protoProps) {
      utils.deepMixIn(child.prototype, protoProps);
    }

    // Set a convenience property in case the parent's prototype is needed
    // later.
    child.__super__ = parent.prototype;
    child.__reheat_super__ = parent;

    return child;
  };
};