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Using 'break' in Loops

Part of the Fundamentals section of Coddy's Dart journey — lesson 45 of 94.

The break statement allows you to exit a loop immediately, regardless of the loop condition.

Create a for loop that stops when it reaches 3:

void main() {
  for (int i = 1; i <= 5; i++) {
    if (i == 3) {
      break;
    }
    print(i);
  }
}

After executing the above code, the output will be:

1
2

Use break to exit a while loop when a condition is met:

void main() {
  int count = 1;
  
  while (count <= 10) {
    print(count);
    if (count == 4) {
      break;
    }
    count++;
  }
}

After executing the above code, the output will be:

Challenge

Beginner

In this challenge, you'll practice using the break statement in a loop. The break statement allows you to exit a loop early when a certain condition is met.

Complete the code to find the first number in the list that is divisible by 5. Once you find it, use break to exit the loop and print the result.

Expected output:

Checking number: 7
Checking number: 12
Checking number: 15
Found it! 15 is divisible by 5

Cheat sheet

The break statement allows you to exit a loop immediately, regardless of the loop condition.

Using break in a for loop:

for (int i = 1; i <= 5; i++) {
  if (i == 3) {
    break;
  }
  print(i);
}

Using break in a while loop:

int count = 1;

while (count <= 10) {
  print(count);
  if (count == 4) {
    break;
  }
  count++;
}

Try it yourself

void main() {
  // List of numbers to check
  List<int> numbers = [7, 12, 15, 20, 25];
  
  // Variable to store the first number divisible by 5
  int result = 0;
  
  for (int number in numbers) {
    print('Checking number: $number');
    
    // TODO: Check if the number is divisible by 5
    // If it is, store it in the result variable and use break to exit the loop
    
  }
  
  // Print the result
  if (result > 0) {
    print('Found it! $result is divisible by 5');
  } else {
    print('No number divisible by 5 was found');
  }
}

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' LoopUsing 'break' in LoopsUsing 'continue' in Loops Recap - Repeating Code

11Functions Basics

What are Functions?Defining a Basic Function Calling 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