# Dart: Types of Comments




# Types of comment

## Single line Comments

Single line comments are very useful to describe quick snippets of code. Type // and type your comment above the code.

	```dart
	// Comments out this line!
	print(hello);
	```

## Block Comments

But, what if we we want to comment multiple lines at once? That's where _block comments_ come in; 

	```dart
	/* var cat = "cat";
	var dog = "dog";
	print(cat == dog); */
	
	notIgnored = "Dragon";
	```

> ❗ Block comments are designed for commenting out code. If you're writing instructions, use single-line comments!  

## Doc Comments


In larger projects with more people, it's helpful to extract the comments you've written into documentation that can be read somewhere besides the code, like a website. Doing this manually would be annoying! So, Dart gives us a particular type of comment that will be recognized by a special comment extractor later. We can create these comments with three slashes `///`


```dart
///This variable contains the greeting the program will give the user
String greeting = "Hello Programmer! I'm your trusty computer";
```

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