HORIZON PROJECT

var assignValue = require('./_assignValue'),

    copyObject = require('./_copyObject'),

    createAssigner = require('./_createAssigner'),

    isArrayLike = require('./isArrayLike'),

    isPrototype = require('./_isPrototype'),

    keys = require('./keys');

/** Used for built-in method references. */

var objectProto = Object.prototype;

/** Used to check objects for own properties. */

var hasOwnProperty = objectProto.hasOwnProperty;

/**

 * Assigns own enumerable string keyed properties of source objects to the

 * destination object. Source objects are applied from left to right.

 * Subsequent sources overwrite property assignments of previous sources.

 *

 * **Note:** This method mutates `object` and is loosely based on

 * [`Object.assign`](https://mdn.io/Object/assign).

 *

 * @static

 * @memberOf _

 * @since 0.10.0

 * @category Object

 * @param {Object} object The destination object.

 * @param {...Object} [sources] The source objects.

 * @returns {Object} Returns `object`.

 * @see _.assignIn

 * @example

 *

 * function Foo() {

 *   this.a = 1;

 * }

 *

 * function Bar() {

 *   this.c = 3;

 * }

 *

 * Foo.prototype.b = 2;

 * Bar.prototype.d = 4;

 *

 * _.assign({ 'a': 0 }, new Foo, new Bar);

 * // => { 'a': 1, 'c': 3 }

 */

var assign = createAssigner(function(object, source) {

  if (isPrototype(source) || isArrayLike(source)) {

    copyObject(source, keys(source), object);

    return;

  }

  for (var key in source) {

    if (hasOwnProperty.call(source, key)) {

      assignValue(object, key, source[key]);

    }

  }

});

module.exports = assign;