How to use YAML comments in Golang

YAML is a format for serializing data implemented based on Indentation Level. It is widely used in configuration files in various fields, such as Kubernetes, Docker, etc. When writing YAML configuration files, comments are one of the effective means to improve readability and maintainability. This article will introduce how to use YAML comments in Golang.

1. Basic syntax

To use YAML configuration files in Golang, you first need to import the yaml package and use the Unmarshal function to parse the contents of the YAML file into the specified data structure type.

Next, we can use data types such as hash or array in the YAML file. An example is as follows:

# This is a YAML Comment
database:
  host: "localhost"
  port: "3306"
  username: "user"
  password: "password"

As can be seen from the above example, the # symbol is used for comments, and comments can be added at the end of the line or within the line. However, if the comment needs to span multiple lines, or if the comment is used within an array or nested structure, the # symbol is not sufficient. At this time, we need to use more powerful YAML annotation techniques.

2. Normal comments

Normal comments are inline comments, that is, adding comments anywhere on a line, similar to // comments in C. Different from # comments, normal comments must A space is followed by at least one character. For example:

app:   # this is a normal comment
  version: "1.0" # this is also a normal comment

3. Block comments

Block comments can add comments in multiple lines. In YAML files, block comments begin with a ! comment, followed by a space and a vertical bar. We can then add a comment between the vertical bar and where the comment ends.

Example:

config:
  server: "localhost"
  port: "3306"
  
  ! This is a block comment
  !  which can extend over multiple lines.
  username: "user"
  password: "password"

4. End comment

The end comment is to add a comment at the end of the array or nested structure. Used to distinguish differences between structure properties.

Example:

data:
  - name: "John"        # First name
    family: "Doe"      # Last name
    age: 40             # Age (in years)
    
  - name: "Anne"
    family: "Doe"
    age: 30
    
  - name: "Bob"
    family: "Doe"
    age: 15             # Last item

The above introduces YAML annotation techniques in Golang. Using annotation techniques can help us write easy-to-read and maintain YAML configuration files.

Summary

YAML comments are one of the effective means to improve the readability and maintainability of configuration files. This article introduces how to use YAML comments in Golang, including normal comments, block comments and end comments. Adding appropriate comments can make the program easier to understand and maintain.

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