# generate

#### signature: `generate(initialStateOrOptions: GenerateOptions, condition?: ConditionFunc, iterate?: IterateFunc, resultSelectorOrObservable?: (ResultFunc) | SchedulerLike, scheduler?: SchedulerLike): Observable`

## Generates an observable sequence by running a state-driven loop producing the sequence's elements, using the specified scheduler to send out observer messages.

### Examples

**Example 1: Generate**

( [StackBlitz](https://stackblitz.com/edit/rxjs-generate?file=index.ts\&devtoolsheight=100) )

```js
// RxJS v6+
import { generate } from 'rxjs';

generate(
  2,
  x => x <= 8,
  x => x + 3
).subscribe(console.log);

/*
OUTPUT:
2
5
8
*/
```

**Example 2: Generate with result selector**

( [StackBlitz](https://stackblitz.com/edit/rxjs-generate-result-selector?file=index.ts\&devtoolsheight=100) )

```js
// RxJS v6+
import { generate } from 'rxjs';

generate(
  2,
  x => x <= 38,
  x => x + 3,
  x => '.'.repeat(x)
).subscribe(console.log);

/*
OUTPUT:
..
.....
........
...........
..............
.................
....................
.......................
..........................
.............................
................................
...................................
......................................
*/
```

### Related Recipes

* [Breakout Game](https://www.learnrxjs.io/learn-rxjs/recipes/breakout-game)
* [Memory Game](https://www.learnrxjs.io/learn-rxjs/recipes/memory-game)

### Additional Resources

* [generate](https://rxjs.dev/api/index/function/generate) 📰 - Official docs

***

> 📁 Source Code: <https://github.com/ReactiveX/rxjs/blob/master/src/internal/observable/generate.ts>