# useSelectors

The big brother of [useSelect](https://co-it.gitbook.io/ngrx-ducks/ngrx-ducks-core/architecture/usepick) is`bindSelectors.`. It works similar, but `useSelectors` allows you to bind a group of selectors that become transformed to Observables at runtime.

{% hint style="info" %}
If you add more and more selectors and they are bound to the facade already, the selectors automatically are available in you component without touching the facade again (see `component.ts`).
{% endhint %}

{% tabs %}
{% tab title="chunk.ts" %}

```typescript
import { useSelectors, StoreChunk } from '@ngrx-ducks/core';

import * as selectors from './selectors';

@StoreChunk()
export class Chunk {
  select = useSelectors(selectors);
}
```

{% endtab %}

{% tab title="component.ts" %}

```typescript
import { Component, OnInit } from '@angular/core';
import { Chunk } from './chunk';
import { greetings } from './selector';

@Component({ /* ... */})
export class SomeComponent implements OnInit {
  greetings: Observable<string[]>;
  greetingsRocket: Observable<string[]>;
  
  constructor(private chunk: Chunk) {}
  
  ngOnInit() {
    this.greetings = this.facade.select.greetings;
    this.greetingsRocket = this.facade.select.greetingsAnnotated('🚀');
  }
}
```

{% endtab %}

{% tab title="selector.ts" %}

```typescript
import { createFeatureSelector, createSelector } from '@ngrx/store';

const feature = createFeatureSelector<State>('some');

// Selector
export const greetings = createSelector(
  feature,
  state => state.greetings
);

// Selector taking parameters
export const greetingsAnnotated = (annotation: string) => createSelector(
  feature,
  state => state.greetings.map(g => `${annotation} ${g}.`)
);

```

{% endtab %}
{% endtabs %}


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