HORIZON PROJECT

var baseMerge = require('./_baseMerge'),

    createAssigner = require('./_createAssigner');

/**

 * This method is like `_.merge` except that it accepts `customizer` which

 * is invoked to produce the merged values of the destination and source

 * properties. If `customizer` returns `undefined`, merging is handled by the

 * method instead. The `customizer` is invoked with six arguments:

 * (objValue, srcValue, key, object, source, stack).

 *

 * **Note:** This method mutates `object`.

 *

 * @static

 * @memberOf _

 * @since 4.0.0

 * @category Object

 * @param {Object} object The destination object.

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

 * @param {Function} customizer The function to customize assigned values.

 * @returns {Object} Returns `object`.

 * @example

 *

 * function customizer(objValue, srcValue) {

 *   if (_.isArray(objValue)) {

 *     return objValue.concat(srcValue);

 *   }

 * }

 *

 * var object = { 'a': [1], 'b': [2] };

 * var other = { 'a': [3], 'b': [4] };

 *

 * _.mergeWith(object, other, customizer);

 * // => { 'a': [1, 3], 'b': [2, 4] }

 */

var mergeWith = createAssigner(function(object, source, srcIndex, customizer) {

  baseMerge(object, source, srcIndex, customizer);

});

module.exports = mergeWith;