[WIP] 第11回Go勉強会の課題@luccafort

channel/task/basic/main.go

@@ -1,6 +1,22 @@
 package main
 
+import (
+	"fmt"
+	"time"
+)
+
 // channel/basicのInt版
 // Goroutine内で好きなIntをchannelを経由でMain Goroutineに渡し標準出力にPrintしてみる。
 func main() {
+	ch := make(chan int, 0)
+	go func(n int) {
+		// いる？
+		time.Sleep(1 * time.Second)
+		// channelへの値の送信(`ch <-`の形式)
+		ch <- n
+	}(13)
+
+	recieved := <-ch
+	fmt.Println("recieved")
+	fmt.Println(recieved)
 }

channel/task/sleep_sort/main.go

@@ -1,4 +1,45 @@
 package main
 
+import (
+	"fmt"
+	"sync"
+	"time"
+)
+
+// 受信専用channel, for range, close←を使ってSleepSortを実装する
 func main() {
+	nums := []int{1, 3, 2, 5, 4}
+	sortedNums := []int{}
+
+	for v := range receivedChan(nums) {
+		fmt.Println(v)
+		sortedNums = append(sortedNums, v)
+	}
+	fmt.Println(sortedNums)
+}
+
+func receivedChan(nums []int) <-chan int {
+	count := len(nums)
+	ch := make(chan int, count)
+	go func(nums []int) {
+		defer close(ch)
+		sleepSortCh(ch, nums)
+	}(nums)
+
+	return ch
+}
+
+func sleepSortCh(ch chan int, nums []int) chan int {
+	var wg sync.WaitGroup
+	for _, num := range nums {
+		wg.Add(1)
+		go func(num int) {
+			defer wg.Done()
+			time.Sleep(time.Duration(num) * time.Second)
+			ch <- num
+		}(num)
+	}
+	wg.Wait()
+
+	return ch
 }