1
|
var castPath = require('./_castPath'),
|
2
|
isFunction = require('./isFunction'),
|
3
|
toKey = require('./_toKey');
|
4
|
|
5
|
/**
|
6
|
* This method is like `_.get` except that if the resolved value is a
|
7
|
* function it's invoked with the `this` binding of its parent object and
|
8
|
* its result is returned.
|
9
|
*
|
10
|
* @static
|
11
|
* @since 0.1.0
|
12
|
* @memberOf _
|
13
|
* @category Object
|
14
|
* @param {Object} object The object to query.
|
15
|
* @param {Array|string} path The path of the property to resolve.
|
16
|
* @param {*} [defaultValue] The value returned for `undefined` resolved values.
|
17
|
* @returns {*} Returns the resolved value.
|
18
|
* @example
|
19
|
*
|
20
|
* var object = { 'a': [{ 'b': { 'c1': 3, 'c2': _.constant(4) } }] };
|
21
|
*
|
22
|
* _.result(object, 'a[0].b.c1');
|
23
|
* // => 3
|
24
|
*
|
25
|
* _.result(object, 'a[0].b.c2');
|
26
|
* // => 4
|
27
|
*
|
28
|
* _.result(object, 'a[0].b.c3', 'default');
|
29
|
* // => 'default'
|
30
|
*
|
31
|
* _.result(object, 'a[0].b.c3', _.constant('default'));
|
32
|
* // => 'default'
|
33
|
*/
|
34
|
function result(object, path, defaultValue) {
|
35
|
path = castPath(path, object);
|
36
|
|
37
|
var index = -1,
|
38
|
length = path.length;
|
39
|
|
40
|
// Ensure the loop is entered when path is empty.
|
41
|
if (!length) {
|
42
|
length = 1;
|
43
|
object = undefined;
|
44
|
}
|
45
|
while (++index < length) {
|
46
|
var value = object == null ? undefined : object[toKey(path[index])];
|
47
|
if (value === undefined) {
|
48
|
index = length;
|
49
|
value = defaultValue;
|
50
|
}
|
51
|
object = isFunction(value) ? value.call(object) : value;
|
52
|
}
|
53
|
return object;
|
54
|
}
|
55
|
|
56
|
module.exports = result;
|