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Go言語のHello Worldを3分で試す

Last updated at Posted at 2016-04-22

golang-project.png

Go言語でHello Worldしてみたくなったので挑戦してみる。

環境

  • MacBook Air (11-inch, Early 2015)
  • Mac OS X El Capitan バージョン 10.11.4

インストール

brewに期待。

$ brew install go
==> Downloading https://homebrew.bintray.com/bottles/go-1.6.el_capitan.bottle.2.
######################################################################## 100.0%
==> Pouring go-1.6.el_capitan.bottle.2.tar.gz
==> Caveats
As of go 1.2, a valid GOPATH is required to use the `go get` command:
  https://golang.org/doc/code.html#GOPATH

You may wish to add the GOROOT-based install location to your PATH:
  export PATH=$PATH:/usr/local/opt/go/libexec/bin
==> Summary
🍺  /usr/local/Cellar/go/1.6: 5,771 files, 324.9M

インストール完了。ほんとにこれでいいのかな?というレベル。

$ which go
/usr/local/bin/go

コマンドも実行できそうだ。

Hello Worldの準備

とりあえず、hello.goを書いてみる。

hello.go
package main

import "fmt"

func main() {
  fmt.Printf("Hello World\n")
}

実行

実行してみる。

$ go run hello.go
Hello World

もうできた!

バイナリを作って実行もできるらしい。

$ go build hello.go
$ ls
hello*		hello.go

おお、バイナリができておる。早速、できたてのバイナリを実行してみる。

$ ./hello
Hello World

あっという間にできた!

参考

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