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Introduction to Dart

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Dart 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:

dart

main

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

              
123

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

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

dart

main

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

              
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:

dart

main

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

              
123

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

Multi-line comment:

dart

main

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

              
12345

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

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

void main() {
// print('Dart'); print('Dart');
print('Dart');
print('Dart');
/* print('Dart'); */
}

Select the correct answer

Everything was clear?

How can we improve it?

Thanks for your feedback!

Section 1. Chapter 4
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