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Defining a Basic Function

Part of the Fundamentals section of Coddy's Dart journey — lesson 65 of 94.

Defining a Basic Function in Dart allows you to create reusable blocks of code that perform specific tasks.

Create a basic function that prints a message:

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

void main() {
  greet();
}

After executing the above code, the output will be:

Hello, Dart programmer!

The function definition has three parts: return type (void), name (greet), and body (code between curly braces). Call the function by writing its name followed by parentheses.

Challenge

Beginner

In this challenge, you'll practice defining a basic function in Dart. Functions are reusable blocks of code that perform specific tasks.

Complete the code below by defining a function called greet that prints a greeting message. The function should:

Take no parameters
Print the text Hello, Dart! when called

After defining the function, it will be called from the main function.

Expected output:

Hello, Dart!

Cheat sheet

To define a basic function in Dart, use the syntax: return type, function name, and body in curly braces:

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

Call the function by writing its name followed by parentheses:

void main() {
  greet();
}

Try it yourself

// TODO: Define a function called 'greet' that prints 'Hello, Dart!'
// The function should take no parameters and return nothing


void main() {
  // This will call your function
  greet();
}

Test yourself

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

All lessons in Fundamentals

1Introduction to Dart

What is Dart?The main Function Printing Output Code Comments

4Operators Part 2

Comparison Operators Logical AND Logical OR Logical NOT Type Test Operators Recap - Making Comparisons

7Working with Strings

String Concatenation String Interpolation Multi-line Strings String Properties Basic String Methods

10Collections - Maps Basics

What are Maps?Creating a Map Accessing Values by Key Key-Value Pairs Getting Map Size Getting Keys Getting Values Checking if a Key Exists

13Null Safety In Depth

Understanding Null Nullable Types Non-Nullable Types Null Assertion Operator Late Initialization Recap - Handling Null Safely

16Fundamentals Challenges

Challenge: List of calculation Challenge: Sum of numbers Challenge: Find product

2Variables and Basic Data Types

What are Variables?Strings Integers (int)Doubles (double)Booleans (bool)Type Inference with 'var'Final Variables Constant Variables Naming Conventions Basic Null Safety Recap - Declaring Variables

5Operators Part 3

Null-aware Operator Null-aware Access Conditional Operator

8Control Flow - Loops

The 'for' Loop The 'while' Loop The 'do-while' Loop Using 'break' in Loops Using 'continue' in Loops Recap - Repeating Code

11Functions Basics

What are Functions?Defining a Basic FunctionCalling a Function Functions with Parameters Functions Returning Values The 'void' Keyword Arrow Syntax Recap - Simple Functions

14Type Conversion

Converting String to int Converting String to double Converting Numbers to String Handling Conversion Errors

3Operators Part 1

Arithmetic Operators Integer Division Modulo Operator Increment and Decrement Assignment Shortcuts Recap - Simple Calculations

6Control Flow - Decision Making

The 'if' Statement The 'else' Statement The 'else if' Statement Recap - Simple Decisions Nested 'if' Statements The 'switch' Statement

9Collections - Lists Basics

What are Lists?Creating a List Accessing by Index Getting List Length Adding Elements Removing Elements Checking if a List is Empty Iterating Over a List

12Functions Advanced

Optional Positional Parameters Named Parameters Required Named Parameters Default Parameter Values Recap - Function Parameters

15Project: Simple Calculator

Setting Up Declaring Number

Project lesson

Creating an Operation

Project lesson

Performing Calculation

Project lesson

Displaying Result

Project lesson