How do you comment code in Dart?

In Dart, commenting code allows you to add explanations within your code without affecting program execution. This helps developers understand the purpose and functionality of the code, and facilitates communication during team collaboration. Dart supports three types of comments:

1. Single-line Comments
2. Multi-line Comments
3. Documentation Comments

Single-line Comments

Single-line comments start with // and apply only to the content following them until the end of the line. For example:

dart
// This is a single-line comment
int a = 5; // This is also a single-line comment, placed after the code

Multi-line Comments

Multi-line comments begin with /* and end with */, spanning multiple lines. They are ideal for commenting out large code sections or providing detailed explanations. For example:

dart
/* This is an example of a multi-line comment
   You can add multiple lines of text
   to describe complex code logic or other information */
int b = 10;

Documentation Comments

Documentation comments generate code documentation and start with /// or /** ... */. They are typically used to describe the purpose and behavior of classes, functions, or variables. For example:

dart
/// Use the `addNumbers` function to calculate the sum of two numbers
/// This function takes two integers and returns their sum
int addNumbers(int num1, int num2) {
  return num1 + num2;
}

Or using a multi-line documentation comment:

dart
/**
 * Check if a number is negative
 * Returns true if the number is less than 0, otherwise false
 */
bool isNegative(int number) {
  return number < 0;
}

By using these methods, you can effectively add comments in Dart to improve code readability and maintainability. Using appropriate comments helps other developers quickly understand your code intent, especially in team collaboration and large projects.