exercism

commit 539fc995fd701436ab3db3f385b56cb25fe082c0
parent bfe7491f4c5326bc6bba9380e0b424b2584284c0
Author: dwrz <dwrz@dwrz.net>
Date:   Thu, 11 Jul 2019 12:32:50 +0000

Refactor go/twelve-days

Diffstat:
M
go/twelve-days/twelve-days.go
 | 
7
+++++++

1 file changed, 7 insertions(+), 0 deletions(-)
diff --git a/go/twelve-days/twelve-days.go b/go/twelve-days/twelve-days.go
@@ -56,7 +56,12 @@ func giftsForDay(day int) string {
 	}
 }
 
+// Verse returns the matching verse for the inputted day.
+// Day must be an integer between 1 and 12.
 func Verse(day int) string {
+	if day < 0 || day > 12 {
+		return ""
+	}
 	return fmt.Sprintf(
 		"On the %s day of Christmas my true love gave to me: %s.",
 		ordinals[day],
@@ -64,6 +69,8 @@ func Verse(day int) string {
 	)
 }
 
+// Song returns the text of the song "Twelve Days of Christmas".
+// Its verses are separated by newlines.
 func Song() (song string) {
 	for day := 1; day <= 12; day++ {
 		song += fmt.Sprintf("%s\n", Verse(day))