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Creating strings

Learn to create Strings with single and double quotes.

Creating strings

In Dart text is held in the String type. You write a String with single quotes ('hello') or double quotes ("hello"). Both give the same result; the choice is yours.

To assign a String to a variable you use the String type or the var keyword: String name = "Alex"; or var name = "Alex";. To print the value to the screen a print(name); call is enough.

Single and double quotes

In Dart single and double quotes are equivalent; which one you choose depends on which quote type appears inside the string. For example "Alex's" is more readable than 'Alex\'s'.

Many Dart programmers prefer double quotes because single quotes (apostrophes) appear more often inside text. What matters is consistency: avoid mixing the two in the same file.

Practice Print the String variable

Declare a String variable name with the value "Alex". Then print it to the screen with print(name);. The output on a single line must be Alex.

Starter code

main.dart
// Declare the String variable and print it

Sample solution

main.dart
String name = "Alex";
print(name);

Expected output

Alex

Questions and answers

Review the lesson questions together with their answers. To test yourself, solve the lesson interactively.

1 Which one is a valid String literal?

main.dart
?
  • "hello" Correct answer
  • <hello>
  • [hello]
  • {hello}

Explanation: Text in double quotes is a String.

2 Complete the String declaration

Question 
String name = ____;
print(name);
Answer 
String name = "Alex";
print(name);

Explanation: "Alex" is a double-quoted String literal.

3 Match the quote type to the example

Term Meaning
"hello" Double-quoted
'hello' Single-quoted
"Alex's" Contains single quote
'"Yes"' Contains double quote

All lessons in Beginner

1 Dart basics

  1. What is Dart?
  2. Your first program
  3. dart run
  4. Comments
  5. String interpolation
  6. Summary - Dart basics

2 Variables

  1. var and type
  2. final
  3. const
  4. late
  5. Null safety
  6. Summary - Variables

3 Data types

  1. Integer types
  2. Floating-point types
  3. bool and String
  4. Type inference
  5. dynamic
  6. Summary - Data types

4 Project: Calculator

  1. Project design
  2. Add and subtract
  3. Multiply and divide
  4. Error handling
  5. Putting it together

5 Operators

  1. Arithmetic operators
  2. Assignment operators
  3. Comparison operators
  4. Logical operators
  5. Null-aware operators
  6. Summary - Operators

6 Strings

  1. Creating strings
  2. String interpolation
  3. length and methods
  4. substring
  5. contains and indexOf
  6. Summary - Strings

7 Conditionals

  1. The if statement
  2. else and else if
  3. switch
  4. Pattern matching
  5. Ternary
  6. Summary - Conditionals

8 Loops

  1. The for loop
  2. The while loop
  3. The do-while loop
  4. for-in
  5. break and continue
  6. Summary - Loops

9 Project: Shopping cart

  1. Cart design
  2. Adding items
  3. Calculating totals
  4. Listing the cart
  5. Putting it together

10 Lists

  1. Creating lists
  2. List access
  3. add and remove
  4. length and contains
  5. List methods
  6. Summary - Lists

11 Sets and Maps

  1. Set
  2. Set operations
  3. Map
  4. Map operations
  5. Map iteration
  6. Summary - Sets and Maps

12 Functions

  1. Defining functions
  2. Return values
  3. Arrow functions
  4. Optional parameters
  5. First-class functions
  6. Summary - Functions

13 Null safety in depth

  1. Nullable types
  2. Null-aware operators
  3. The ! operator
  4. late
  5. Null check
  6. Summary - Null safety

14 Class basics

  1. class
  2. Constructor
  3. Instance variables
  4. Methods
  5. this
  6. Summary - Class basics

15 Project: To-do CLI

  1. Task model
  2. Adding tasks
  3. Listing tasks
  4. Completing tasks
  5. Putting it together

16 Advanced string operations

  1. split and join
  2. replace
  3. trim and pad
  4. RegExp
  5. StringBuffer
  6. Summary - Advanced strings

17 Enums

  1. Defining enums
  2. Enum values
  3. Enhanced enums
  4. switch with enum
  5. Enum and patterns
  6. Summary - Enums

18 Exceptions

  1. try/catch
  2. throw
  3. finally
  4. The Exception class
  5. on clause
  6. Summary - Exceptions

19 Async basics

  1. Future
  2. async/await
  3. then
  4. Future.error
  5. Future.wait
  6. Summary - Async basics

20 Beginner final

  1. Project design
  2. Classes
  3. Collections
  4. Error handling
  5. Putting it together