add: slice internals last lectures

16-slices/11-slice-internals-4-append/4-example-growth/main.go

@@ -0,0 +1,27 @@
+// For more tutorials: https://blog.learngoprogramming.com
+//
+// Copyright © 2018 Inanc Gumus
+// Learn Go Programming Course
+// License: https://creativecommons.org/licenses/by-nc-sa/4.0/
+//
+
+package main
+
+import (
+	"fmt"
+)
+
+func main() {
+	ages, oldCap := []int{1}, 1.
+
+	for len(ages) < 5e5 {
+		ages = append(ages, 1)
+
+		c := float64(cap(ages))
+		if c != oldCap {
+			fmt.Printf("len:%-10d cap:%-10g growth:%.2f\n",
+				len(ages), c, c/oldCap)
+		}
+		oldCap = c
+	}
+}