_baseSet.js
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_baseSet.js
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			var assignValue = require('./_assignValue'),
			castPath = require('./_castPath'),
			isIndex = require('./_isIndex'),
			isObject = require('./isObject'),
			toKey = require('./_toKey');

			/**
			* The base implementation of `_.set`.
			*
			* @private
			* @param {Object} object The object to modify.
			* @param {Array\|string} path The path of the property to set.
			* @param {*} value The value to set.
			* @param {Function} [customizer] The function to customize path creation.
			* @returns {Object} Returns `object`.
			*/
			function baseSet(object, path, value, customizer) {
			if (!isObject(object)) {
			return object;
			}
			path = castPath(path, object);

			var index = -1,
			length = path.length,
			lastIndex = length - 1,
			nested = object;

			while (nested != null && ++index < length) {
			var key = toKey(path[index]),
			newValue = value;

			if (key === '__proto__' \|\| key === 'constructor' \|\| key === 'prototype') {
			return object;
			}

			if (index != lastIndex) {
			var objValue = nested[key];
			newValue = customizer ? customizer(objValue, key, nested) : undefined;
			if (newValue === undefined) {
			newValue = isObject(objValue)
			? objValue
			: (isIndex(path[index + 1]) ? [] : {});
			}
			}
			assignValue(nested, key, newValue);
			nested = nested[key];
			}
			return object;
			}

			module.exports = baseSet;