Exercise: The Built-in `NgClass` Directive

An NgClass with a string expression

Now, let’s get ready for a quick task.

Objectives

In this task, we’ll improve a button component from the previous lesson.

There are four classes that can be applied to a button:

• The app-button class can be used for default styles of any button.
• The warn-button class styles buttons in red.
• The primary-button class styles buttons to use primary design colors.
• The secondary-button class styles buttons to use secondary design colors.

The button itself has two input properties:

• The color input can take one of

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