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Preprocessor directives like #define and #ifdef are commonly used to make source code easy to update and compile in a variety of execution environments. The preprocessor is instructed to take specific actions by directives in the source file.

  • NgClass — adds and removes CSS classes in a set.
  • NgStyle —adds and removes a set of HTML styles.
  • NgModel —additionally binds two-way data to an HTML form element.

Attribute directives, structural directives, and components are the three types of directives in Angular.

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