lean into examples

examples/range/range.go

@@ -0,0 +1,21 @@
+package main
+
+import "fmt"
+
+func main() {
+    var x [5]float64
+    x[0] = 98
+    x[1] = 93
+    x[2] = 77
+    x[3] = 82
+    x[4] = 83
+
+    var total float64 = 0
+    for _, value := range x {
+        total += value
+    }
+    fmt.Println(total / float64(len(x)))
+}
+
+// todo: comment on maps
+// todo: comment on channels