Which part of a Golang function annotation is used to represent the receiver of a function?

In Go function annotations, the receiver represents the type or value that the function operates on or modifies, usually starting with an asterisk character (*), followed by the name of the type. Receivers are used to: 1. Modify the value of the receiver type; 2. Access private fields or methods of the receiver type; 3. Perform operations on behalf of the receiver type.

The receiver representation in Go function comments

In the comments of Go function, the receiver part is used to represent the type that the function will operate or modify. or value. It usually starts with an asterisk character (*), followed by the name of the type.

Format:

func (r *receiverType) functionName(parameters) returnType

Where:

• r is the name of the recipient, which can be any identifier, but ## is usually used #this, receiver, or the lowercase form of the type name.
• *receiverType Indicates the type of receiver. The asterisk indicates that the receiver will be passed as a pointer.
• functionName is the name of the function.
• parameters is the parameter list of the function.
• returnType is the return type of the function (optional).

Practical case

Consider the following function:

// Change the value of a string using a pointer receiver.
func (s *string) ChangeValue(newValue string) {
    *s = newValue
}

In this function, the receiver type is a pointer to a string (

*string). This means that when the function is called, it receives a pointer to a string, and it can modify the value of that string.

When to use a receiver

Use a receiver in the following situations:

When a function needs to modify the value of the receiver type.
• When the function needs to access private fields or methods of the receiver type.
• When a function needs to perform some operation on behalf of the receiver type.

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