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Introduction to Dart

bookDart Comments

Developers often need a tool to make their code easier to understand. It's often helpful for himself and the people he works with on code. A comment is a text that the Dart interpreter ignores, allowing us to explain parts of the code. There are several main uses for comments.

An explanation of what the code does:

main.dart

main.dart

copy

              
123

            
void main() {
  print('Correct'); // Output word "Correct" to console
}

We often comment out code blocks to avoid errors at runtime:

main.dart

main.dart

copy

              
12345

            
void main() {
  print('Hello, World!');
  //; print Hello, World!"'()
  print("Hello, World!");
}

Code Syntax

Dart supports single-line comments // and multi-line comments /* */.

Single-line comment:

main.dart

main.dart

copy

              
123

            
void main() {
  print('info'); // Output 'info' to console  
}

Multi-line comment:

main.dart

main.dart

copy

              
12345

            
void main() {
  /* Multi-line 
    comment */
  print("Very useful topic");
}
question mark

How many times will the word Dart be displayed in the console?

Select the correct answer

Tudo estava claro?

Como podemos melhorá-lo?

Obrigado pelo seu feedback!

Seção 1. Capítulo 4

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Developers often need a tool to make their code easier to understand. It's often helpful for himself and the people he works with on code. A comment is a text that the Dart interpreter ignores, allowing us to explain parts of the code. There are several main uses for comments.

An explanation of what the code does:

main.dart

main.dart

copy

              
123

            
void main() {
  print('Correct'); // Output word "Correct" to console
}

We often comment out code blocks to avoid errors at runtime:

main.dart

main.dart

copy

              
12345

            
void main() {
  print('Hello, World!');
  //; print Hello, World!"'()
  print("Hello, World!");
}

Code Syntax

Dart supports single-line comments // and multi-line comments /* */.

Single-line comment:

main.dart

main.dart

copy

              
123

            
void main() {
  print('info'); // Output 'info' to console  
}

Multi-line comment:

main.dart

main.dart

copy

              
12345

            
void main() {
  /* Multi-line 
    comment */
  print("Very useful topic");
}
question mark

How many times will the word Dart be displayed in the console?

Select the correct answer

Tudo estava claro?

Como podemos melhorá-lo?

Obrigado pelo seu feedback!

Seção 1. Capítulo 4
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