Flash cards
Review the key moves
What is the main idea behind Go Comments?
Lesson checks
Practice each idea before moving on
Short Mimo-style checks built from this lesson's code, terms, and sequence.
Which statement best captures the main point of this lesson?
Complete the missing token from the example code.
// ___ is a comment package main import ("fmt") func main() { // This is a comment fmt.Println("Hello World!")Put the learning moves in the order that makes the concept easiest to apply.
A comment is a text that is ignored upon execution.
Comments can be used to explain the code, and to make it more readable.
Comments can also be used to prevent code execution when testing an alternative code.
Go supports single-line or multi-line comments.
Go Single-line Comments
Single-line comments start with two forward slashes ( // ).
Any text between // and the end of the line is ignored by the compiler (will not be executed).
Example
// This is a comment package main import ("fmt") func main() { // This is a comment fmt.Println("Hello World!")
}The following example uses a single-line comment at the end of a code line:
Example
package main
import ("fmt")
func main() {
fmt.Println("Hello World!")
// This is a comment
}Go Multi-line Comments
Multi-line comments start with /* and ends with */ .
Any text between /* and */ will be ignored by the compiler:
Example
package main
import ("fmt")
func main() {
/* The code below will print Hello World
to the screen, and it is amazing */
fmt.Println("Hello World!")
}Tip
It is up to you which you want to use. Normally, we use // for short comments, and /* */ for longer comments.
Comment to Prevent Code Execution
You can also use comments to prevent the code from being executed.
The commented code can be saved for later reference and troubleshooting.
Example
package main
import ("fmt")
func main() {
fmt.Println("Hello World!")
// fmt.Println("This line does not execute")
}