Go - building storage - Structs - fields, exporting, capital letter, literal

Head First Go
楽天ブックス 紀伊國屋書店

開発環境

• macOS Mojave - Apple (OS)
• Emacs (Text Editor)
• Windows 10 Pro (OS)
• Visual Studio Code (Text Editor)
• Go (プログラミング言語)

Head First Go (Jay McGavren(著)、O'Reilly Media)のChapter 8(building storage - Structs)、Pool Puzzle(252)の解答を求めてみる。

コード

sample4_test.go

package main

import (
 "headfirstgo/geo"
 "testing"
)

func TestPublicStruct(t *testing.T) {
 location := geo.Coordinates{Latitude: 37.42, Longitude: -122.08}
 wants := []float64{37.42, -122.08}
 gots := []float64{location.Latitude, location.Longitude}
 s := []string{"Latitude", "Longitude"}
 for i, got := range gots {
  want := wants[i]
  if got != want {
   t.Errorf("%s = got %f, want %f", s[i], got, want)
  }
 }
}

sample4.go

package main

func main() {}

~~/go/src/headfirstgo/geo/geo.go

package geo

type Coordinates struct {
 Latitude  float64
 Longitude float64
}

入出力結果(Bash、cmd.exe(コマンドプロンプト)、Terminal)

$ go test
PASS
ok   _/.../go/Head_First_Go/ch8/sample4 0.005s
$