concurrency/generator: refactor generator pattern

concurrency/generator.go

@@ -0,0 +1,24 @@
+package generator
+
+func Range(start int, end int, step int) chan int {
+	c := make(chan int)
+
+	go func() {
+		result := start
+		for result < end {
+			c <- result
+			result = result + step
+		}
+
+		close(c)
+	}()
+
+	return c
+}
+
+func main() {
+	// print the numbers from 3 through 47 with a step size of 2
+	for i := range Range(3, 47, 2) {
+		println(i)
+	}
+}