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'),
7 safeGet = require('./_safeGet');
10 * The base implementation of `_.merge` without support for multiple sources.
13 * @param {Object} object The destination object.
14 * @param {Object} source The source object.
15 * @param {number} srcIndex The index of `source`.
16 * @param {Function} [customizer] The function to customize merged values.
17 * @param {Object} [stack] Tracks traversed source values and their merged
20 function baseMerge(object, source, srcIndex, customizer, stack) {
21 if (object === source) {
24 baseFor(source, function(srcValue, key) {
25 stack || (stack = new Stack);
26 if (isObject(srcValue)) {
27 baseMergeDeep(object, source, key, srcIndex, baseMerge, customizer, stack);
30 var newValue = customizer
31 ? customizer(safeGet(object, key), srcValue, (key + ''), object, source, stack)
34 if (newValue === undefined) {
37 assignMergeValue(object, key, newValue);
42 module.exports = baseMerge;