Built-in pipes (date, currency, uppercase) in Angular - Practice Problems & Coding Challenges

Challenge - 5 Problems

❓ component_behavior

intermediate

What is the rendered output of this Angular template?

Given the component property today = new Date('2024-06-15T12:00:00Z'), what will be displayed by this template?

<p>{{ today | date:'fullDate' }}</p>

Angular

<p>{{ today | date:'fullDate' }}</p>

A Saturday, June 15, 2024

B Jun 15, 2024

C 15/06/2024

D 2024-06-15

💡 Hint

The 'fullDate' format shows the day of the week, month name, day, and year.

The Angular date pipe with 'fullDate' format outputs the full weekday name, full month name, day, and year in the local format. For the given date, it renders as 'Saturday, June 15, 2024'.

📝 Syntax

intermediate

Which option correctly formats a number as US dollars with 2 decimals using Angular currency pipe?

You want to display the number 1234.5 as $1,234.50 in your template. Which pipe usage is correct?

Angular

<p>{{ amount | currency:??? }}</p>

A currency:'USD':'symbol':'1.0-0'

B currency:'USD':'code':'1.0-0'

C currency:'USD':'symbol':'2.0-2'

D currency:'USD':'symbol':'1.2-2'

💡 Hint

The format string '1.2-2' means minimum 1 digit before decimal, minimum 2 decimals, maximum 2 decimals.

Option D uses the correct format string '1.2-2' to show exactly two decimals, and 'symbol' to show the dollar sign. This produces '$1,234.50'. Other options either show no decimals or wrong decimal counts.

❓ component_behavior

advanced

What is the output of this Angular template using uppercase pipe?

Given the component property name = 'Angular', what will this template render?

<h1>{{ name | uppercase }}</h1>

Angular

<h1>{{ name | uppercase }}</h1>

A ANGULAR

B angular

C Angular

D AnGuLaR

💡 Hint

The uppercase pipe converts all letters to capital letters.

The uppercase pipe transforms all characters in the string to uppercase, so 'Angular' becomes 'ANGULAR'.

🔧 Debug

advanced

What happens in this Angular template with null input?

Consider this template snippet:

{{ price | currency:'USD':'symbol':'1.2-2' }}

Given price = null in the component, what occurs and why?

Angular

{{ price | currency:'USD':'symbol':'1.2-2' }}

A Syntax error due to wrong pipe usage

B No error; renders an empty string because the pipe returns null for null input

C Runtime error: Cannot read property 'toString' of null

D Displays 'null' as string without formatting

💡 Hint

Angular currency pipe returns null for null or undefined inputs, which renders as empty string in the template.

There is no error. The Angular currency pipe returns null when the input is null or undefined, so the template displays an empty string.

🧠 Conceptual

expert

How does Angular's date pipe handle timezone differences in output?

Given date = new Date('2024-06-15T12:00:00Z') and template {{ date | date:'short' }}, which statement is true about the displayed time?

Angular

{{ date | date:'short' }}

A The time is always shown in UTC

B The time is shown in the server's timezone

C The time is shown in the browser's local timezone

D The time is shown in GMT regardless of user location

💡 Hint

Angular date pipe formats dates according to the client environment.

Angular's date pipe formats dates using the browser's local timezone by default, so the time shown depends on the user's location.