commit 4a3f455d061c343b1c65bca7fccf4d22ba252ee9
Author: GO <go@go.jdg>
Date:   Thu Sep 2 19:08:57 2021 +0000

    first commit

diff --git a/createAGoModule/greetings/go.mod b/createAGoModule/greetings/go.mod
new file mode 100644
index 0000000..efd7fb4
--- /dev/null
+++ b/createAGoModule/greetings/go.mod
@@ -0,0 +1,3 @@
+module example.com/greetings
+
+go 1.17
diff --git a/createAGoModule/greetings/greetings.go b/createAGoModule/greetings/greetings.go
new file mode 100644
index 0000000..1b1736c
--- /dev/null
+++ b/createAGoModule/greetings/greetings.go
@@ -0,0 +1,59 @@
+package greetings
+
+import (
+	"errors"
+	"fmt"
+    "math/rand"
+    "time"
+)
+
+// Hello returns a greeting for the named person.
+func Hello(name string) (string, error) {
+    // If no name was given, return an error with a message.
+    if name == "" {
+        return name, errors.New("empty name")
+    }
+    // Create a message using a random format.
+    message := fmt.Sprintf(randomFormat(), name)
+//    message := fmt.Sprintf(randomFormat())
+    return message, nil
+}
+
+// Hellos returns a map that associates each of the named people
+// with a greeting message.
+func Hellos(names []string) (map[string]string, error) {
+    // A map to associate names with messages.
+    messages := make(map[string]string)
+    // Loop through the received slice of names, calling
+    // the Hello function to get a message for each name.
+    for _, name := range names {
+        message, err := Hello(name)
+        if err != nil {
+            return nil, err
+        }
+        // In the map, associate the retrieved message with
+        // the name.
+        messages[name] = message
+    }
+    return messages, nil
+}
+
+// init sets initial values for variables used in the function.
+func init() {
+    rand.Seed(time.Now().UnixNano())
+}
+
+// randomFormat returns one of a set of greeting messages. The returned
+// message is selected at random.
+func randomFormat() string {
+    // A slice of message formats.
+    formats := []string{
+        "Hi, %v. Welcome!",
+        "Great to see you, %v!",
+        "Hail, %v! Well met!",
+    }
+
+    // Return a randomly selected message format by specifying
+    // a random index for the slice of formats.
+    return formats[rand.Intn(len(formats))]
+}
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diff --git a/createAGoModule/greetings/greetings_test.go b/createAGoModule/greetings/greetings_test.go
new file mode 100644
index 0000000..8754141
--- /dev/null
+++ b/createAGoModule/greetings/greetings_test.go
@@ -0,0 +1,26 @@
+package greetings
+
+import (
+    "testing"
+    "regexp"
+)
+
+// TestHelloName calls greetings.Hello with a name, checking
+// for a valid return value.
+func TestHelloName(t *testing.T) {
+    name := "Gladys"
+    want := regexp.MustCompile(`\b`+name+`\b`)
+    msg, err := Hello("Gladys")
+    if !want.MatchString(msg) || err != nil {
+        t.Fatalf(`Hello("Gladys") = %q, %v, want match for %#q, nil`, msg, err, want)
+    }
+}
+
+// TestHelloEmpty calls greetings.Hello with an empty string,
+// checking for an error.
+func TestHelloEmpty(t *testing.T) {
+    msg, err := Hello("")
+    if msg != "" || err == nil {
+        t.Fatalf(`Hello("") = %q, %v, want "", error`, msg, err)
+    }
+}
\ No newline at end of file
diff --git a/createAGoModule/hello/go.mod b/createAGoModule/hello/go.mod
new file mode 100644
index 0000000..ca52192
--- /dev/null
+++ b/createAGoModule/hello/go.mod
@@ -0,0 +1,7 @@
+module example.com/hello
+
+go 1.17
+
+replace example.com/greetings => ../greetings
+
+require example.com/greetings v0.0.0-00010101000000-000000000000
diff --git a/createAGoModule/hello/hello b/createAGoModule/hello/hello
new file mode 100755
index 0000000..c077c79
Binary files /dev/null and b/createAGoModule/hello/hello differ
diff --git a/createAGoModule/hello/hello.go b/createAGoModule/hello/hello.go
new file mode 100644
index 0000000..58d5527
--- /dev/null
+++ b/createAGoModule/hello/hello.go
@@ -0,0 +1,34 @@
+package main
+
+import (
+    "fmt"
+	"log"
+
+    "example.com/greetings"
+)
+
+func main() {
+    // Set properties of the predefined Logger, including
+    // the log entry prefix and a flag to disable printing
+    // the time, source file, and line number.
+    log.SetPrefix("greetings: ")
+    log.SetFlags(0)
+
+
+    // Request a greeting message.
+    // message, err := greetings.Hello("Gladys")
+	
+    // A slice of names.
+    names := []string{"Gladys", "Samantha", "Darrin"}
+	message, err := greetings.Hellos(names)
+
+    // If an error was returned, print it to the console and
+    // exit the program.
+    if err != nil {
+        log.Fatal(err)
+    }
+
+    // If no error was returned, print the returned message
+    // to the console.
+    fmt.Println(message)
+}
\ No newline at end of file