add: slice internals backing array and slice header

16-slices/08-slice-internals-1-backing-array/1-theory/main.go

@@ -0,0 +1,44 @@
+// 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 s "github.com/inancgumus/prettyslice"
+
+func main() {
+	// ages, first and last2 have the same backing arrays
+	ages := []int{35, 15, 25}
+	first := ages[0:1]
+	last2 := ages[1:3]
+
+	ages[0] = 55
+	ages[1] = 10
+	ages[2] = 20
+
+	// grades and ages have separate backing arrays
+	grades := []int{70, 99}
+	grades[0] = 50
+
+	s.Show("ages", ages)
+	s.Show("ages[0:1]", first)
+	s.Show("ages[1:3]", last2)
+	s.Show("grades", grades)
+
+	// let's create a new scope
+	// 'cause i'm going to use variables with the same name
+	{
+		// ages and agesArray have the same backing arrays
+		agesArray := [3]int{35, 15, 25}
+		ages := agesArray[0:3]
+
+		ages[0] = 100
+		ages[2] = 50
+
+		s.Show("agesArray", agesArray[:])
+		s.Show("agesArray's ages", ages)
+	}
+}