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 )
// 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 )
// 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​
​Memory Game​
Additional Resources
​generate 📰 - Official docs
📁 Source Code: https://github.com/ReactiveX/rxjs/blob/master/src/internal/observable/generate.ts​
fromEvent
interval
Last updated 2 years ago