lodash/object/create.js

var baseCopy = require('../internal/baseCopy'),
    baseCreate = require('../internal/baseCreate'),
    isIterateeCall = require('../internal/isIterateeCall'),
    keys = require('./keys');

/**
 * Creates an object that inherits from the given `prototype` object. If a
 * `properties` object is provided its own enumerable properties are assigned
 * to the created object.
 *
 * @static
 * @memberOf _
 * @category Object
 * @param {Object} prototype The object to inherit from.
 * @param {Object} [properties] The properties to assign to the object.
 * @param- {Object} [guard] Enables use as a callback for functions like `_.map`.
 * @returns {Object} Returns the new object.
 * @example
 *
 * function Shape() {
 *   this.x = 0;
 *   this.y = 0;
 * }
 *
 * function Circle() {
 *   Shape.call(this);
 * }
 *
 * Circle.prototype = _.create(Shape.prototype, { 'constructor': Circle });
 *
 * var circle = new Circle;
 * circle instanceof Circle;
 * // => true
 *
 * circle instanceof Shape;
 * // => true
 */
function create(prototype, properties, guard) {
  var result = baseCreate(prototype);
  if (guard && isIterateeCall(prototype, properties, guard)) {
    properties = null;
  }
  return properties ? baseCopy(properties, result, keys(properties)) : result;
}

module.exports = create;