throw

signature: throw(error: any, scheduler: Scheduler): Observable
Emit error on subscription.
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Examples
Example 1: Throw error on subscription
( StackBlitz | jsBin | jsFiddle )
// RxJS v6+
import { throwError } from 'rxjs';
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//emits an error with specified value on subscription
const source = throwError('This is an error!');
//output: 'Error: This is an error!'
const subscribe = source.subscribe({
  next: val => console.log(val),
  complete: () => console.log('Complete!'),
  error: val => console.log(`Error: ${val}`)
});
Related Examples
​Throwing after 3 retries​
Additional Resources
​throw 📰 - Official docs
​Creation operators: empty, never, and throw​
🎥 💵 - André Staltz
📁 Source Code: https://github.com/ReactiveX/rxjs/blob/master/src/internal/observable/throwError.ts​

range

timer

Last modified 3yr ago