first hello module

hello/go.mod

@@ -0,0 +1,3 @@
+module hello
+
+go 1.22.1

hello/hello.go

@@ -0,0 +1,11 @@
+package main
+
+import "fmt"
+
+func Hello() string {
+  return "Hello, world!"
+}
+
+func main () {
+  fmt.Println(Hello())
+}

hello/hello_test.go

@@ -0,0 +1,12 @@
+package main
+
+import "testing"
+
+func TestHello(t *testing.T) {
+  given := Hello()
+  expected := "Hello, world!"
+
+  if given != expected {
+    t.Errorf("given: %v, expected: %v", given, expected)
+  }
+}

src/01-hello.go

@@ -1,7 +0,0 @@
-package main
-
-import "fmt"
-
-func main() {
-  fmt.Println("Hello World")
-}

src/02-values.go

@@ -1,10 +0,0 @@
-package main
-
-import "fmt"
-
-func main() {
-  fmt.Println("concat" + " " + "strings")
-  fmt.Println("1 + 1 =", 1 + 1)
-  fmt.Println("7.0 / 3.0 =", 7.0 / 3.0)
-  fmt.Println(true && false)
-}

src/03-variables.go

@@ -1,26 +0,0 @@
-package main
-
-import "fmt"
-
-func main() {
-  var a = "initial"
-  fmt.Println(a)
-
-  a = "changed"
-  fmt.Println(a)
-
-  var b, c int = 1, 2
-  fmt.Println("b=", b, ", c=", c)
-
-  var d = true
-  fmt.Println(d)
-
-  var e int
-  fmt.Println(e)
-
-  f := "short"
-  fmt.Println(f)
-
-  f = "changed short"
-  fmt.Println(f)
-}

src/04-constants.go

@@ -1,19 +0,0 @@
-package main
-
-import (
-  "fmt"
-  "math"
-)
-
-const s string = "this is a constant"
-
-func main() {
-  fmt.Println(s)
-
-  const n = 500000000
-  const d = 3e20 / n
-
-  fmt.Println(d)
-  fmt.Println(int64(d))
-  fmt.Println(math.Sin(n))
-}

src/05-for.go

@@ -1,28 +0,0 @@
-package main
-
-import "fmt"
-
-func main() {
-  i := 1
-  for i <= 3 {
-    fmt.Println("number i =", i)
-    i = i + 1
-  }
-
-  for j := 0; j < 3; j++ {
-    fmt.Println("number j =", j)
-  }
-
-  for {
-    fmt.Println("loop with no condition")
-    break
-  }
-
-  for n := range 6 {
-    if n%2 == 0 {
-      fmt.Println("even number n = ", n)
-      continue
-    }
-    fmt.Println("odd number n = ", n)
-  }
-}