Function Select$

Selects an observable using the given path selector, and runs it through the given transformer function. A transformer function takes the store observable as an input and returns a derived observable from it. That derived observable is run through distinctUntilChanges with the given optional comparator and attached to the store property.

Think of a Transformer as a FunctionSelector that operates on observables instead of values.

import { select$ } from '@angular-redux2/store';

export const debounceAndTriple = obs$ => obs$
 .debounce(300)
 .map(x => 3 * x);

class Foo {
     @Select$(['foo', 'bar'], debounceAndTriple)
     readonly debouncedFooBar$: Observable<number>;
}