1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
var castPath = require('./_castPath'),    isArguments = require('./isArguments'),    isArray = require('./isArray'),    isIndex = require('./_isIndex'),    isLength = require('./isLength'),    toKey = require('./_toKey');
/** * Checks if `path` exists on `object`. * * @private * @param {Object} object The object to query. * @param {Array|string} path The path to check. * @param {Function} hasFunc The function to check properties. * @returns {boolean} Returns `true` if `path` exists, else `false`. */function hasPath(object, path, hasFunc) {  path = castPath(path, object);
  var index = -1,      length = path.length,      result = false;
  while (++index < length) {    var key = toKey(path[index]);    if (!(result = object != null && hasFunc(object, key))) {      break;    }    object = object[key];  }  if (result || ++index != length) {    return result;  }  length = object == null ? 0 : object.length;  return !!length && isLength(length) && isIndex(key, length) &&    (isArray(object) || isArguments(object));}
module.exports = hasPath;