_baseMerge.js
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_baseMerge.js
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			var Stack = require('./_Stack'),
			assignMergeValue = require('./_assignMergeValue'),
			baseFor = require('./_baseFor'),
			baseMergeDeep = require('./_baseMergeDeep'),
			isObject = require('./isObject'),
			keysIn = require('./keysIn'),
			safeGet = require('./_safeGet');

			/**
			* The base implementation of `_.merge` without support for multiple sources.
			*
			* @private
			* @param {Object} object The destination object.
			* @param {Object} source The source object.
			* @param {number} srcIndex The index of `source`.
			* @param {Function} [customizer] The function to customize merged values.
			* @param {Object} [stack] Tracks traversed source values and their merged
			* counterparts.
			*/
			function baseMerge(object, source, srcIndex, customizer, stack) {
			if (object === source) {
			return;
			}
			baseFor(source, function(srcValue, key) {
			stack \|\| (stack = new Stack);
			if (isObject(srcValue)) {
			baseMergeDeep(object, source, key, srcIndex, baseMerge, customizer, stack);
			}
			else {
			var newValue = customizer
			? customizer(safeGet(object, key), srcValue, (key + ''), object, source, stack)
			: undefined;

			if (newValue === undefined) {
			newValue = srcValue;
			}
			assignMergeValue(object, key, newValue);
			}
			}, keysIn);
			}

			module.exports = baseMerge;