UNPKG

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