add: slice internals exercises

16-slices/exercises/20-observe-the-cap-growth/solution/main.go

@@ -0,0 +1,29 @@
+// 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() {
+	var (
+		nums   []int
+		oldCap float64
+	)
+
+	for len(nums) < 10e6 {
+		c := float64(cap(nums))
+
+		if c == 0 || c != oldCap {
+			fmt.Printf("len:%-15d cap:%-15g growth:%-15.2f\n",
+				len(nums), c, c/oldCap)
+		}
+		oldCap = c
+
+		nums = append(nums, 1)
+	}
+}