Rx.helpers.pluck(property)
Plucks a property from the object.
Arguments
property(String): The property name to pluck from the object.
Returns
(Boolean): true if equal; else false.
Example
var pluck = Rx.helpers.pluck;
var source = Rx.Observable.interval(1000)
  .timeInterval()
  .map(pluck('value'))
  .take(3);
source.subscribe(console.log.bind(console));
// => 0
// => 1
// => 2