package main

import "fmt"

/*
working with slice s:

capacity: 5
array: [ | | | | ]
size: 2
s[0] = 0, s[1] = 1
array: [0|1| | | ]

s = append(s, 10)
size: 3
array: [0|1|10| | ]

s = append(s, 20)
capacity: 10
size: 4
array: [0|1|10|20| | | | | ..]

*/

func main() {
	s1 := make([]int, 10)

	s1[0] = 10
	s1[1] = 20
	s1[2] = 30

	fmt.Printf("s1: %+v, len(s1): %d, cap(s1): %d\n", s1, len(s1), cap(s1))

	s1 = append(s1, 10)

	fmt.Printf("s1: %+v, len(s1): %d, cap(s1): %d\n", s1, len(s1), cap(s1))

	for index, value := range s1 {
		fmt.Printf("s1[%d]: %d,", index, value)
	}
	fmt.Println()

	s2 := make([]int, 0, 10)

	s2 = append(s2, 10)

	fmt.Printf("s2: %+v, len(s2): %d, cap(s2): %d\n", s2, len(s2), cap(s2))

	// expanding slice with append in action
	s := make([]int, 10, 10)

	fmt.Println("before appending a new variable into s")
	fmt.Printf("address of s is %p\n", &s)
	fmt.Printf("address of s[0] is %p\n", &s[0])

	s = append(s, 15)

	fmt.Println("after appending a new variable into s")
	fmt.Printf("address of s is %p\n", &s)
	fmt.Printf("address of s[0] is %p\n", &s[0])
}