[Solved] Identify the error in the following code snippet that uses the pipe method:import { of } from 'rxjs'; import { map, filter } from 'rxjs/operators'; const obs$ = of(1, 2, 3); obs$.... | Angular

Angular - RxJS Operators

Identify the error in the following code snippet that uses the pipe method:

import { of } from 'rxjs';
import { map, filter } from 'rxjs/operators';

const obs$ = of(1, 2, 3);
obs$.pipe(
  map(x => x * 2),
  filter(x => x > 3)
).subscribe(console.log());

ACalling subscribe with parentheses executes immediately

BIncorrect import of operators

CMissing semicolon after pipe method

DUsing arrow functions inside pipe is invalid

Step-by-Step Solution

Solution:

Step 1: Check subscribe usage
The code calls subscribe(console.log()) which immediately executes console.log and passes its result (undefined) to subscribe.
Step 2: Correct subscribe usage
It should be subscribe(console.log) without parentheses to pass the function reference.
Final Answer:
Calling subscribe with parentheses executes immediately -> Option A
Quick Check:
subscribe needs function reference, not call = A [OK]

Quick Trick: Pass function to subscribe, don't call it [OK]

Common Mistakes:

MISTAKES

Calling subscribe with parentheses
Confusing operator imports
Thinking semicolon affects pipe chaining

Master "RxJS Operators" in Angular

9 interactive learning modes - each teaches the same concept differently

Learn Why Deep Visual Try Challenge Project Recall Perf

More Angular Quizzes

Identify the error in the following code snippet that uses the pipe method:

Step 1: Check subscribe usage

Step 2: Correct subscribe usage

Final Answer:

Quick Check:

Want More Practice?