What are Variables?

Part of the Fundamentals section of Coddy's Dart journey — lesson 5 of 94.

Variables store data in your program. Create them by specifying type, name, and value:

void main() {
  String name = 'Dart Programmer';
  print(name);
}

Variables can be referenced and modified throughout your code:

void main() {
  String language = 'Dart';
  print('I am learning ' + language);
  
  language = 'Dart programming';
  print('I am learning ' + language);
}

Cheat sheet

Variables store data in your program. Create them by specifying type, name, and value:

String name = 'Dart Programmer';

Variables can be referenced and modified throughout your code:

String language = 'Dart';
print('I am learning ' + language);

language = 'Dart programming';
print('I am learning ' + language);

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.

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

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

Creating an Operation

Performing Calculation

Displaying Result