Similarities and differences of golang method functions

Similarities and differences between functions and methods in Go language: Similarities: Same declaration method (func keyword) Same structure (name, parameter list, return type) Can return multiple values ​​Differences: Attribution: Method belongs Structure type, function global calling method: the method is called through the structure instance and the dot operator, the function directly calls the receiver: the method has the receiver of the structure instance implicitly passed

Similarities and differences between functions and methods in Go language

In Go language, functions and methods have similarities and differences. This article will explore their similarities and differences in detail.

Similarities

• Declaration method: Functions and methods are declared using the func keyword.
• Structure: Both have a name, optional parameter list, and a return type.
• Return value: Both functions and methods can return multiple values.

The difference

• Attribution: Function is global, while method belongs to structure type.
• Calling method: Functions are called using their names, while methods are called using the structure instance name and the dot operator.
• Receiver: The method has a special parameter called the receiver, which implicitly passes the structure instance to the method.
• Modifiers: methods can have the following modifiers: func (default), method, and func method. The first two modifiers are equivalent, while the third is redundant.

Practical case

Consider a structure representing a point:

type Point struct {
    x, y int
}

We can define a Move method To modify the position of the point:

func (p *Point) Move(dx, dy int) {
    p.x += dx
    p.y += dy
}

Here, the Point structure will implicitly serve as the receiver of the Move method.

To use the Move method, we create a Point instance and call the method on it:

p := Point{1, 2}
p.Move(3, 4)

Summary

Functions and methods in the Go language are powerful constructs used to implement various functions. Functions are global and can be called independently of any type, whereas methods are associated with a specific structure type. Understanding the similarities and differences between them is crucial to getting the most out of the Go language.

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