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### `Rx.Observable.prototype.pluck(property)`
[Ⓢ](https://github.com/Reactive-Extensions/RxJS/blob/master/src/core/linq/observable/pluck.js#L10 "View in source")
Returns an Observable containing the value of a specified nested property from
all elements in the Observable sequence. If a property can't be resolved, it
will return `undefined` for that value.
#### Arguments
1. `property` *(`String`)*: The property or properties to pluck. `pluck`
accepts an unlimited number of nested property parameters.
#### Returns
*(`Observable`)*: Returns a new Observable sequence of property values.
#### Example
```js
var source = Rx.Observable
.from([
{ value: 0 },
{ value: 1 },
{ value: 2 }
])
.pluck('value');
var subscription = source.subscribe(
function (x) {
console.log('Next: ' + x);
},
function (err) {
console.log('Error: ' + err);
},
function () {
console.log('Completed');
});
// => Next: 0
// => Next: 1
// => Next: 2
// => Completed
// Using nested properties:
var source = Rx.Observable
.from([
{ valueA: { valueB: { valueC: 0 }}},
{ valueA: { valueB: { valueC: 1 }}},
{ valueA: { valueB: 2 }},
])
.pluck('valueA', 'valueB', 'valueC');
var subscription = source.subscribe(
function (x) {
console.log('Next: ' + x);
},
function (err) {
console.log('Error: ' + err);
},
function () {
console.log('Completed');
});
// => Next: 0
// => Next: 1
// => Next: undefined
// => Completed
```
### Location
File:
- [`/src/core/linq/observable/pluck.js`](https://github.com/Reactive-Extensions/RxJS/blob/master/src/core/linq/observable/pluck.js)
Dist:
- [`rx.all.js`](https://github.com/Reactive-Extensions/RxJS/blob/master/dist/rx.all.js)
- [`rx.all.compat.js`](https://github.com/Reactive-Extensions/RxJS/blob/master/dist/rx.all.compat.js)
- [`rx.js`](https://github.com/Reactive-Extensions/RxJS/blob/master/dist/rx.js)
- [`rx.compat.js`](https://github.com/Reactive-Extensions/RxJS/blob/master/dist/rx.compat.js)
- [`rx.lite.js`](https://github.com/Reactive-Extensions/RxJS/blob/master/dist/rx.lite.js)
- [`rx.lite.compat.js`](https://github.com/Reactive-Extensions/RxJS/blob/master/dist/rx.lite.compat.js)
Prerequisites:
- None
NPM Packages:
- [`rx`](https://www.npmjs.org/package/rx)
NuGet Packages:
- [`RxJS-All`](http://www.nuget.org/packages/RxJS-All/)
- [`RxJS-Main`](http://www.nuget.org/packages/RxJS-Main/)
- [`RxJS-Lite`](http://www.nuget.org/packages/RxJS-Lite/)
Unit Tests:
- [`/tests/observable/pluck.js`](https://github.com/Reactive-Extensions/RxJS/blob/master/tests/observable/pluck.js)
|
