从单独的程序包/文件夹导入代码[重复]

Question

This question already has an answer here:

• Imported struct from other package is undefined 1 answer

I have this directory layout:

/baba
   biz.go         # package baba
/hello
   foo.go         # package main

biz.go looks like this:

package baba

func Foodd(z int) int {
    return z + 5
}

and foo.go looks like this:

package main

import (
    "fmt"
    "log"
)

func main() {
    log.Fatal(Foodd(3))
}

currently this doesn't compile because Foodd is not recognized. How do I import the baba package in foo.go?

I assume if I compile like so, that it will pull in the right files:

go build foo.go

Or do I need to include the files in the baba package in the go build command? (I would hope not).

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Answer 1

You need to import the baba package in order to use it from your main package. That will look something like:

package main

import (
    "fmt"
    "log"

    "github.com/the1mills/myproject/baba"
)

func main() {
    log.Fatal(baba.Foodd(3))
}

Imported packages are referred to by their package name, which is usually, but not always, the last element of the import path.

Usually, people let goimports handle finding the correct import path and automatically adding it. Your editor of choice probably has goimports integration.

Also see this answer for some other references and how to set up your directory structure.