add: slice internals backing array and slice header

16-slices/exercises/16-internals-backing-array-fix/solution/main.go

@@ -0,0 +1,35 @@
+// 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"
+	"math/rand"
+	"time"
+)
+
+func main() {
+	rand.Seed(time.Now().UnixNano())
+	nums := rand.Perm(100)
+
+	// ----------------------------------------
+	// breaks the connection:
+	// mine and nums now have different backing arrays
+
+	// verbose solution:
+	// var mine []int
+	// mine = append(mine, nums[:3]...)
+
+	// better solution (almost the same thing):
+	mine := append([]int(nil), nums[:3]...)
+	// ----------------------------------------
+
+	mine[0], mine[1], mine[2] = -50, -100, -150
+	fmt.Println("Mine         :", mine)
+	fmt.Println("Original nums:", nums[:3])
+}