1 var Stack = require('./_Stack'),
2 arrayEach = require('./_arrayEach'),
3 assignMergeValue = require('./_assignMergeValue'),
4 baseMergeDeep = require('./_baseMergeDeep'),
5 isArray = require('./isArray'),
6 isObject = require('./isObject'),
7 isTypedArray = require('./isTypedArray'),
8 keysIn = require('./keysIn');
11 * The base implementation of `_.merge` without support for multiple sources.
14 * @param {Object} object The destination object.
15 * @param {Object} source The source object.
16 * @param {number} srcIndex The index of `source`.
17 * @param {Function} [customizer] The function to customize merged values.
18 * @param {Object} [stack] Tracks traversed source values and their merged counterparts.
20 function baseMerge(object, source, srcIndex, customizer, stack) {
21 if (object === source) {
24 var props = (isArray(source) || isTypedArray(source)) ? undefined : keysIn(source);
25 arrayEach(props || source, function(srcValue, key) {
28 srcValue = source[key];
30 if (isObject(srcValue)) {
31 stack || (stack = new Stack);
32 baseMergeDeep(object, source, key, srcIndex, baseMerge, customizer, stack);
35 var newValue = customizer ? customizer(object[key], srcValue, (key + ''), object, source, stack) : undefined;
36 if (newValue === undefined) {
39 assignMergeValue(object, key, newValue);
44 module.exports = baseMerge;