add: slices - first part

16-slices/02-slices-vs-arrays/main.go

@@ -0,0 +1,38 @@
+// 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 array [2]int
+
+	// zero value of an array is zero-valued elements
+	fmt.Printf("array       : %#v\n", array)
+
+	// nope: arrays are fixed length
+	// array[2] = 0
+
+	var slice []int
+
+	// zero value of a slice is nil
+	fmt.Println("slice == nil?", slice == nil)
+
+	// nope: they don't exist:
+	// _ = slice[0]
+	// _ = slice[1]
+
+	// len function still works though
+	fmt.Println("len(slice)  :", len(slice))
+
+	// array's length is part of its type
+	fmt.Printf("array's type: %T\n", array)
+
+	// whereas, slice's length isn't part of its type
+	fmt.Printf("slice's type: %T\n", slice)
+}