Here are a few title options, keeping in mind the question-and-answer format: * What Do the Brackets After `func` Mean in Go? (Simple and direct) * Go Methods: Understanding Brackets After `func` (Hi

Method Syntax in Go: Unraveling the Meaning of Brackets After func

In Go, beginners may encounter code snippets like the following, where brackets are immediately appended to func:

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

This syntax might leave you wondering: "What exactly do those brackets signify?"

To clarify, we're not dealing with a regular function here but a method. Specifically, this code defines a method named MarshalJSON for the Version struct type.

Let's deconstruct the syntax:

• v is the receiver value. Analogous to Java's "this" or Python's "self," it represents the instance on which the method is invoked.
• Version specifies the receiver type. It indicates the struct type for which we're adding the method.

For further elaboration and examples, refer to the Go by Example website. More technical details can be found in the Go Language Specification.

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