Java programmer tried to touch Go language (for the time being)
My name is keita69sawada.
Since it seems that I will make a command line tool, I investigated the development language from the following viewpoints.
- The source code cannot be seen by the user (provided in binary)
- Any user's environment (cross-compilation)
- Low learning cost
Go language (golang) looks good! !!
Then, "Would you like to try something in Go language for the time being!" This article was uni-uni.
Target audience
- People who want to touch the Go language a little
Prerequisites
- You are using a Windows terminal
procedure
1. Prepare the development environment
1-1. Install chocolately (Windows package manager)
See here https://qiita.com/keita69sawada/items/5b7af117a313aae02399
1-2. Install GO language and editor (Visual Studio Code)
Copy and paste the following on the command line to install it.
command
choco install -y golang
choco install -y VisualStudioCode
2. Let's create Hello World in Go language
2-1. Creating a project (working directory)
Copy and paste to the command line.
command
mkdir c:\tmp\project\bin
mkdir c:\tmp\project\src\main
mkdir c:\tmp\project\pkg
The Go language project (directory) structure is as follows.
project(directory)Constitution
C:\tmp\project
├─bin
├─pkg
└─src
└─main
2-2. Setting the environment variable GOPATH
Set the starting path GOPATH.
set GOPATH=C:\tmp\project
2-3. Implementation (copy and paste)
In the editor (Visual Studio Code), go to % GOPATH% \ src \ main \ hello.go
Copy the sauce.
- From Official HP
src
package main
import "fmt"
func main() {
fmt.Println("Hello,world")
}
2-4. Compile and create an .exe file
command
go build -o %GOPATH%\bin\hello.exe %GOPATH%\src\main\hello.go
The exe file is created.
result
C:\tmp\project
├─bin
│ hello.exe
├─pkg
│ └─windows_amd64
│ hello.a
└─src
└─main
hello.go
2-5. Try running hello.exe
command
%GOPATH%\bin\hello.exe
I think it will move quickly.
Summary
This time, it's "touch it for the time being", so it ends with the experience of "The .exe file was created after building! Oh, it worked!". Next, I plan to find time to try out the functions of external command calls and API calls.
Reference URL
- Go language official website https://golang.org/
- First Go-Simple language specifications, type system, concurrency http://gihyo.jp/dev/feature/01/go_4beginners
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