lodash/_isPrototype.js

define(['./isFunction'], function(isFunction) {

  /** Used for built-in method references. */
  var objectProto = Object.prototype;

  /**
   * Checks if `value` is likely a prototype object.
   *
   * @private
   * @param {*} value The value to check.
   * @returns {boolean} Returns `true` if `value` is a prototype, else `false`.
   */
  function isPrototype(value) {
    var Ctor = value && value.constructor,
        proto = (isFunction(Ctor) && Ctor.prototype) || objectProto;

    return value === proto;
  }

  return isPrototype;
});