1var assignValue = require('./_assignValue'),
2    castPath = require('./_castPath'),
3    isIndex = require('./_isIndex'),
4    isObject = require('./isObject'),
5    toKey = require('./_toKey');
6
7/**
8 * The base implementation of `_.set`.
9 *
10 * @private
11 * @param {Object} object The object to modify.
12 * @param {Array|string} path The path of the property to set.
13 * @param {*} value The value to set.
14 * @param {Function} [customizer] The function to customize path creation.
15 * @returns {Object} Returns `object`.
16 */
17function baseSet(object, path, value, customizer) {
18  if (!isObject(object)) {
19    return object;
20  }
21  path = castPath(path, object);
22
23  var index = -1,
24      length = path.length,
25      lastIndex = length - 1,
26      nested = object;
27
28  while (nested != null && ++index < length) {
29    var key = toKey(path[index]),
30        newValue = value;
31
32    if (key === '__proto__' || key === 'constructor' || key === 'prototype') {
33      return object;
34    }
35
36    if (index != lastIndex) {
37      var objValue = nested[key];
38      newValue = customizer ? customizer(objValue, key, nested) : undefined;
39      if (newValue === undefined) {
40        newValue = isObject(objValue)
41          ? objValue
42          : (isIndex(path[index + 1]) ? [] : {});
43      }
44    }
45    assignValue(nested, key, newValue);
46    nested = nested[key];
47  }
48  return object;
49}
50
51module.exports = baseSet;
52