From a9779a3f8cb5298548fbb54e6d288d54a2aa1bc1 Mon Sep 17 00:00:00 2001
From: Jeff Carr <jcarr@wit.com>
Date: Sun, 13 Nov 2022 14:55:38 -0600
Subject: [PATCH] more examples

---
 example-go-channel/Makefile       |  5 +++
 example-go-channel/main.go        |  1 +
 example-go-channel/return-vals.go | 52 +++++++++++++++++++++++++++++++
 3 files changed, 58 insertions(+)
 create mode 100644 example-go-channel/return-vals.go

diff --git a/example-go-channel/Makefile b/example-go-channel/Makefile
index eea6cea..c35c838 100644
--- a/example-go-channel/Makefile
+++ b/example-go-channel/Makefile
@@ -4,3 +4,8 @@ build:
 
 simple:
 	GO111MODULE="off" go build -v -x -o ~/go/bin/simple-worker simple-worker.go
+	simple-worker
+
+return-vals:
+	GO111MODULE="off" go build -v -x -o ~/go/bin/return-vals return-vals.go
+	return-vals
diff --git a/example-go-channel/main.go b/example-go-channel/main.go
index a986987..cdb25a3 100644
--- a/example-go-channel/main.go
+++ b/example-go-channel/main.go
@@ -14,6 +14,7 @@ func generateNumbers(total int, ch chan<- int, wg *sync.WaitGroup) {
 	for idx := 1; idx <= total; idx++ {
 		fmt.Printf("START sending %d to channel\n", idx)
 		ch <- idx
+		// res, err := (<-r)()
 		fmt.Printf("END sending %d to channel\n", idx)
 	}
 	wg.Wait()
diff --git a/example-go-channel/return-vals.go b/example-go-channel/return-vals.go
new file mode 100644
index 0000000..307d2ef
--- /dev/null
+++ b/example-go-channel/return-vals.go
@@ -0,0 +1,52 @@
+package main
+
+import (
+	"log"
+)
+
+var res int
+var err error
+
+type FuncResult func() (int, error)
+/*
+
+func funcWithError(f chan FuncResult) {
+	f <- (func() (int, error) { return 123, nil })
+}
+
+func main() {
+	r := make(chan FuncResult)
+	//...
+}
+*/
+
+
+func funcWithError(f chan FuncResult) {
+	f <- (func() (int, error) { return 123, nil })
+}
+
+func blah() (int, error) {
+	log.Println("Ran blah()")
+	return 21, nil
+}
+
+func main() {
+	// r := make(chan func() (int, error))
+	r := make(chan FuncResult)
+	go funcWithError(r)
+	res, err = (<-r)()
+	if err == nil {
+		log.Printf("My result is %d again!", res)
+	} else {
+		log.Printf("The func returned an error: %s", err)
+	}
+
+	/*
+	r <= blah
+	if err == nil {
+		log.Printf("My result is %d again!", res)
+	} else {
+		log.Printf("The func returned an error: %s", err)
+	}
+	*/
+}