Исходники и презентации

lessons/channels/operations_with_channel/main.go

@@ -0,0 +1,91 @@
+package main
+
+import (
+	"fmt"
+)
+
+func writeToNilChannel() {
+	var ch chan int
+	ch <- 1
+}
+
+func writeToClosedChannel() {
+	ch := make(chan int, 2)
+	close(ch)
+	ch <- 20
+}
+
+// Descibe read after close
+
+func readFromChannel() {
+	ch := make(chan int, 2)
+	ch <- 10
+	ch <- 20
+
+	val, ok := <-ch
+	fmt.Println(val, ok)
+
+	close(ch)
+	val, ok = <-ch
+	fmt.Println(val, ok)
+
+	val, ok = <-ch
+	fmt.Println(val, ok)
+}
+
+func readAnyChannels() {
+	ch1 := make(chan int)
+	ch2 := make(chan int)
+
+	go func() {
+		ch1 <- 100
+	}()
+
+	go func() {
+		ch2 <- 200
+	}()
+
+	select {
+	case val1 := <-ch1:
+		fmt.Println(val1)
+	case val2 := <-ch2:
+		fmt.Println(val2)
+	}
+}
+
+func readFromNilChannel() {
+	var ch chan int
+	<-ch
+}
+
+func rangeNilChannel() {
+	var ch chan int
+	for range ch {
+
+	}
+}
+
+func closeNilChannel() {
+	var ch chan int
+	close(ch)
+}
+
+func closeChannelAnyTimes() {
+	ch := make(chan int)
+	close(ch)
+	close(ch)
+}
+
+func compareChannels() {
+	ch1 := make(chan int)
+	ch2 := make(chan int)
+
+	equal1 := ch1 == ch2
+	equal2 := ch1 == ch1
+
+	fmt.Println(equal1)
+	fmt.Println(equal2)
+}
+
+func main() {
+}