Question
Answer and Explanation
TypeScript, like JavaScript, supports two primary types of comments:
1. Single-Line Comments:
- Single-line comments are used to add a comment on a single line. They start with two forward slashes //. Anything after // on that line is ignored by the TypeScript compiler.
- Example:
// This is a single-line comment in TypeScript
let x: number = 10; // This is also a single-line comment
2. Multi-Line Comments (Block Comments):
- Multi-line comments, also known as block comments, are used to add comments that span multiple lines. They start with / and end with /. Everything between these delimiters is ignored by the TypeScript compiler.
- Example:
/
This is a multi-line comment in TypeScript.
It can span multiple lines.
/
function add(a: number, b: number): number {
return a + b;
}
Usage and Best Practices:
- Single-line comments are typically used for short explanations or notes within a line of code.
- Multi-line comments are used for longer explanations, documenting code blocks, or temporarily disabling sections of code during development.
- It's good practice to use comments to explain complex logic, clarify the purpose of functions or variables, and provide context for future developers (including yourself).
- Comments should be clear, concise, and up-to-date with the code they describe.
- Avoid over-commenting; code should be self-explanatory where possible. Focus on explaining the "why" rather than the "what".
In summary, TypeScript supports both single-line (//) and multi-line (/ ... /) comments, which are essential for code documentation and maintainability.