Do the first letters of Go language interfaces have to be capitalized?

Yes, in Go language, the first letter of the interface is usually capitalized. This is done to: follow conventions; improve readability and stand out in the code; and distinguish between types and instances. Exceptions to the rule include embedded interfaces and test interfaces, whose first letter can be lowercase.

Does the first letter of Go language interface have to be capitalized?

In the Go language, an interface is a type that defines a set of methods. Normally, the first letter of an interface is uppercase. There are several reasons for doing this:

• Convention: The Go language community agrees to capitalize the first letter of the interface.
• Improve readability: Capitalizing the first letter makes the interface more visible in the code and easier to identify.
• Distinguish between types and instances: If the first letter of an interface is lowercase, it is easy to be confused with other types.

Exceptions to the rule:

In some cases, the first letter of an interface does not have to be capitalized:

• Embed Type interface: If a type embeds an interface, the first letter of the embedded interface can be lowercase.
• Test interface: In test code, the first letter of the interface can be lowercase to indicate that it is for testing purposes.

Practical case:

The following example shows how to define an interface and the use of capitalizing its first letter:

// 定义一个名为 Shape 的接口
type Shape interface {
    Area() float64
}

// 定义一个实现 Shape 接口的 Circle 类型
type Circle struct {
    Radius float64
}

// 实现 Circle 类型的方法 Area()
func (c Circle) Area() float64 {
    return math.Pi * c.Radius * c.Radius
}

// 使用 Shape 接口声明一个变量
var s Shape = Circle{10}

// 调用 s 的 Area() 方法
fmt.Println(s.Area()) // 输出：314.1592653589793

In this example , the first letter of the Shape interface is capitalized, indicating that it is an interface type. The Circle type implements the Shape interface, so it has an Area() method. The variable s is declared of type Shape and assigned a Circle instance. We can call the Area() method on s because the Circle type implements this interface.

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