What do the Brackets After `func` in Go Methods Indicate?

Understanding Brackets After func in Go Methods

In Go, you may encounter brackets following a func keyword. These signify a method, not a function. Let's understand this feature with a specific example:

func (v Version) MarshalJSON() ([]byte, error) {
  return json.Marshal(v.String())
}

Here, we have a method named MarshalJSON attached to the Version struct type. The syntax:

• (v Version): This part represents the method receiver. For methods, the first parameter is always the receiver value. Here, v represents an instance of the Version struct.
• func: Indicates that this is a method.
• MarshalJSON(): The method name, followed by its signature.

So, in this example, the MarshalJSON method of the Version struct converts its string representation to JSON.

The above is the detailed content of What do the Brackets After `func` in Go Methods Indicate?. For more information, please follow other related articles on the PHP Chinese website!