debounceTime for input throttling in Angular - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to import the debounceTime operator from RxJS.

Angular

import { [1] } from 'rxjs/operators';

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

Amap

BdebounceTime

Cfilter

DswitchMap

Attempts:

3 left

💡 Hint

Common Mistakes

Importing the wrong operator like map or filter.

Forgetting to import debounceTime at all.

The debounceTime operator is imported from rxjs/operators to delay input events.

2fill in blank

medium

Complete the code to apply debounceTime of 300 milliseconds to the input observable.

Angular

this.inputControl.valueChanges.pipe([1](300)).subscribe(value => { /* handle value */ });

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

AdebounceTime

Bfilter

Cmap

DswitchMap

Attempts:

3 left

💡 Hint

Common Mistakes

Using map instead of debounceTime.

Not passing the delay time as argument.

The debounceTime(300) delays the input events by 300 milliseconds to throttle rapid changes.

3fill in blank

hard

Fix the error in the pipe to correctly throttle input changes with debounceTime.

Angular

this.searchInput.valueChanges.pipe(debounceTime[1]).subscribe(result => { /* process result */ });

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

A300

B[300]

C{300}

D(300)

Attempts:

3 left

💡 Hint

Common Mistakes

Using square brackets or curly braces instead of parentheses.

Omitting parentheses entirely.

The debounceTime operator requires parentheses with the delay time as a number argument, like (300).

4fill in blank

hard

Fill both blanks to create a reactive form control that throttles input with debounceTime and filters out empty strings.

Angular

this.control.valueChanges.pipe([1](400), [2](value => value.trim() !== '')).subscribe(val => { /* use val */ });

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

AdebounceTime

Bfilter

Cmap

Dtap

Attempts:

3 left

💡 Hint

Common Mistakes

Reversing the order of operators.

Using map instead of filter for condition.

Use debounceTime(400) to delay input and filter to skip empty strings.

5fill in blank

hard

Fill all three blanks to create a reactive input that throttles with debounceTime, filters empty values, and maps to lowercase.

Angular

this.search.valueChanges.pipe([1](500), [2](val => val.length > 0), [3](val => val.toLowerCase())).subscribe(filteredVal => { /* use filteredVal */ });

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

AdebounceTime

Bfilter

Cmap

Dtap

Attempts:

3 left

💡 Hint

Common Mistakes

Mixing the order of operators.

Using tap instead of map for transformation.

The input is throttled with debounceTime, empty values removed with filter, and converted to lowercase with map.