pipe method for chaining operators in Angular - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to create a signal that doubles its value using the pipe method.

Angular

const doubled = signal(5).[1](map(x => x * 2));

Drag options to blanks, or click blank then click option'

Apipe

Bsubscribe

Cmap

Dfilter

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'subscribe' instead of 'pipe' which is for observables, not signals.

Trying to call 'map' directly on the signal without 'pipe'.

The pipe method is used to chain operators like map on signals in Angular.

2fill in blank

medium

Complete the code to chain two operators: map and filter using the pipe method.

Angular

const result = signal(10).[1](map(x => x + 5), filter(x => x > 10));

Drag options to blanks, or click blank then click option'

AswitchMap

Bpipe

Ctap

Dsubscribe

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'subscribe' which is for consuming observables, not chaining operators.

Trying to call operators without using 'pipe'.

The pipe method chains multiple operators like map and filter on a signal.

3fill in blank

hard

Fix the error in the code by completing the method to chain operators correctly.

Angular

const updated = signal(3).[1](filter(x => x > 1), map(x => x * 10));

Drag options to blanks, or click blank then click option'

Apipe

Bsubscribe

Cmap

Dfilter

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'subscribe' which is for observables, not signals.

Calling 'map' or 'filter' directly without 'pipe'.

The pipe method is required to chain multiple operators like filter and map on a signal.

4fill in blank

hard

Fill both blanks to create a signal that filters values greater than 5 and then maps them to their squares.

Angular

const processed = signal([2, 6, 8]).[1](filter(x => x > 5), [2](x => x * x));

Drag options to blanks, or click blank then click option'

Apipe

Bmap

Cfilter

Dsubscribe

Attempts:

3 left

💡 Hint

Common Mistakes

Putting 'subscribe' instead of 'pipe' for chaining.

Swapping 'filter' and 'map' in the wrong places.

Use pipe to chain operators, first filter then map to transform the signal values.

5fill in blank

hard

Fill all three blanks to chain operators that filter even numbers, map them to strings, and then tap to log each value.

Angular

const final = signal([1, 2, 3, 4]).[1](filter(x => x % 2 === 0), [2](x => x.toString()), [3](x => console.log(x)));

Drag options to blanks, or click blank then click option'

Apipe

Bmap

Ctap

Dsubscribe

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'subscribe' instead of 'pipe' for chaining.

Mixing up 'tap' and 'map' operators.

Use pipe to chain filter, map, and tap operators on the signal.