1 var Stack = require('./_Stack'),
2 assignMergeValue = require('./_assignMergeValue'),
3 baseFor = require('./_baseFor'),
4 baseMergeDeep = require('./_baseMergeDeep'),
5 isObject = require('./isObject'),
6 keysIn = require('./keysIn');
9 * The base implementation of `_.merge` without support for multiple sources.
12 * @param {Object} object The destination object.
13 * @param {Object} source The source object.
14 * @param {number} srcIndex The index of `source`.
15 * @param {Function} [customizer] The function to customize merged values.
16 * @param {Object} [stack] Tracks traversed source values and their merged
19 function baseMerge(object, source, srcIndex, customizer, stack) {
20 if (object === source) {
23 baseFor(source, function(srcValue, key) {
24 if (isObject(srcValue)) {
25 stack || (stack = new Stack);
26 baseMergeDeep(object, source, key, srcIndex, baseMerge, customizer, stack);
29 var newValue = customizer
30 ? customizer(object[key], srcValue, (key + ''), object, source, stack)
33 if (newValue === undefined) {
36 assignMergeValue(object, key, newValue);
41 module.exports = baseMerge;