How to use lowercase-named functions in different files within the same package?

Lowercase function names are used in different files in the same package in Go language

The Go language package management mechanism determines the visibility in the package. In the same Go package, all files can directly access functions and variables declared in the package without considering their name case.

This article takes a project named gin_demo as an example, and its structure is as follows:

 <code>gin_demo ├── app │ └── blog │ ├── handler.go │ └── router.go ├── go.mod ├── go.sum ├── main.go └── routers └── routers.go</code>

The main.go file has introduced gin_demo/app/blog package and uses the functions exported in router.go . Now, we need to use ahandler and bhandler functions in handler.go in app/blog/router.go .

handler.go :

 package blog

import "github.com/gin-gonic/gin"

func ahandler(c *gin.Context) {
    // Processing logic}

func bhandler(c *gin.Context) {
    // Processing logic}

router.go :

 package blog

import (
    "github.com/gin-gonic/gin"
)

func routers(e *gin.Engine) {
    e.GET("/a", ahandler)
    e.GET("/b", bhandler)
}

Since router.go and handler.go belong to the same blog package, router.go can call ahandler and bhandler directly without import or changing the function name to capitalization. Visibility within the Go language package allows for such direct calls. Therefore, the code in router.go needs no modification, you can use ahandler and bhandler directly.

Summary: In the same Go package, files can directly access functions and variables declared in the package, regardless of whether their names start with capital letters. No explicit import or export is required.

It should be noted that although visible inside the package, a good code style still recommends that the exposed functions start with capital letters to clearly indicate that they are the public interface of the package. The functions used internally start with lowercase letters, which can improve the readability and maintainability of the code.

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