What are Functions?

Part of the Fundamentals section of Coddy's Dart journey — lesson 64 of 94.

Functions are reusable blocks of code that perform specific tasks. They help organize your code and avoid repetition.

Create a simple function that prints a greeting:

void sayHello() {
  print('Hello, Dart!');
}

void main() {
  sayHello();
}

After executing the above code, the output will be:

Hello, Dart!

Functions can be called multiple times from different places in your code:

void main() {
  sayHello();
  print('Other code...');
  sayHello();
}

void sayHello() {
  print('Hello, Dart!');
}

After executing the above code, the output will be:

Hello, Dart!
Other code...
Hello, Dart!

Cheat sheet

Functions are reusable blocks of code that perform specific tasks. They help organize your code and avoid repetition.

Create a function using the void keyword followed by the function name and parentheses:

void sayHello() {
  print('Hello, Dart!');
}

Call a function by using its name followed by parentheses:

void main() {
  sayHello();
}

Functions can be called multiple times from different places in your code:

void main() {
  sayHello();
  print('Other code...');
  sayHello();
}

Try it yourself

This lesson doesn't include a code challenge.

Test yourself

This lesson includes a short quiz. Start the lesson to answer it and track your progress.

1Introduction to Dart

4Operators Part 2

7Working with Strings

10Collections - Maps Basics

13Null Safety In Depth

16Fundamentals Challenges

3Operators Part 1

6Control Flow - Decision Making

9Collections - Lists Basics

12Functions Advanced

15Project: Simple Calculator