Angular Interview Practice

Which of the following is NOT a built-in Angular pipe?

1. Slice

2. Reversed

3. Currency

4. Lowercase

The correct answer is: Reversed

The reason B, "Reversed," is identified as not being a built-in Angular pipe is that it is not included in the standard set of pipes that Angular provides out of the box. Angular comes with several built-in pipes that help transform data in templates, including the Slice pipe, which allows you to create a new array or string by slicing a portion of the original data. The Currency pipe formats a number as currency, automatically adding the appropriate currency symbol and formatting. The Lowercase pipe is used to transform a string to all lowercase characters. These three are standard features in Angular, serving specific data transformation purposes within templates. In contrast, "Reversed" is not part of this standard set and would require you to create a custom pipe if you want to implement functionality that reverses the order of an array or string. This is why it stands out as the option that does not belong to the built-in collection of pipes in Angular.