Merge pull request #6508 from pokgopun/pwc013

pwc013 - refactor task#1 to use go package

1 files changed, 28 insertions, 33 deletions

diff --git a/challenge-013/pokgopun/go/ch-1.go b/challenge-013/pokgopun/go/ch-1.go
index d7e704436e..f11935cf4f 100644
--- a/challenge-013/pokgopun/go/ch-1.go
+++ b/challenge-013/pokgopun/go/ch-1.go
@@ -1,42 +1,37 @@
+/* https://theweeklychallenge.org/blog/perl-weekly-challenge-013/
+
+Challenge #1
+
+     Write a script to print the date of last Friday of every month of a
+     given year. For example, if the given year is 2019 then it should
+     print the following:
+
+2019/01/25
+2019/02/22
+2019/03/29
+2019/04/26
+2019/05/31
+2019/06/28
+2019/07/26
+2019/08/30
+2019/09/27
+2019/10/25
+2019/11/29
+2019/12/27
+*/
 package main
 
 import (
 	"fmt"
+	"os"
+	"strings"
 	"time"
+
+	"github.com/pokgopun/go/lastweekday"
 )
 
 func main() {
-	fmt.Println(newLastWeekdayOfMonth(time.Friday, 2019))
-}
-func monthdayCount(y int) (r [12]int) {
-	r = [12]int{31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31}
-	if y%4 == 0 {
-		r[time.February]++
-	}
-	return r
-}
-
-type lastWeekdayOfMonth [12]time.Time
-
-func (lwdom lastWeekdayOfMonth) String() (r string) {
-	for _, t := range lwdom {
-		r += fmt.Sprintln(t.Format("2006/01/02"))
-	}
-	return r
-}
-func newLastWeekdayOfMonth(wd time.Weekday, y int) (lwdom lastWeekdayOfMonth) {
-	for i, v := range monthdayCount(y) {
-		// Find offset between the last day of the month and the specified weekday
-		t := time.Date(y, time.Month(i+1), v, 0, 0, 0, 0, time.UTC)
-		o := int(wd - t.Weekday())
-		// The offset is the number of day we need to go back to the latest specified weekday in certain month
-		if o != 0 {
-			// plus sign indicate the offset between specified weekday and the current weekday of the previous week
-			if o > 0 {
-				o -= 7
-			}
-		}
-		lwdom[i] = t.AddDate(0, 0, o)
-	}
-	return lwdom
+	var year uint = 2019
+	fmt.Sscanf(strings.Join(os.Args[1:], ""), "%d", &year)
+	fmt.Println(lastweekday.New(time.Friday, year, "2006/01/02"))
 }