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Converting Numbers to String

Part of the Fundamentals section of Coddy's Dart journey — lesson 85 of 94.

The toString() method converts numbers to strings. This is useful when you need to display numbers as text or combine them with other strings.

Convert an integer to a string:

int age = 25;
String ageText = age.toString();
print(ageText);

After executing the above code, the output will be:

Convert a double to a string:

double price = 19.99;
String priceText = price.toString();
print(priceText);

After executing the above code, the output will be:

19.99

Challenge

Beginner

In this challenge, you'll practice converting numbers to strings using the toString() method in Dart. This method converts a numeric value into its string representation.

Complete the code to convert the score variable to a string and store it in the scoreAsString variable.

Expected output:

Original score (number): 85
Converted score (string): 85
Type of converted score: String

Cheat sheet

The toString() method converts numbers to strings:

Convert an integer to a string:

int age = 25;
String ageText = age.toString();

Convert a double to a string:

double price = 19.99;
String priceText = price.toString();

Try it yourself

void main() {
  // This number is already defined for you
  int score = 85;
  
  // TODO: Convert the score to a string using toString()
  // and store it in the scoreAsString variable
  String scoreAsString = "";
  
  // This will display the results
  print('Original score (number): $score');
  print('Converted score (string): $scoreAsString');
  print('Type of converted score: ${scoreAsString is String ? "String" : "Not a String"}');
}

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 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 doubleConverting Numbers to StringHandling 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