slice.go

package main

import "fmt"

func main() {
	// create slice from array
	var months = [...]string{
		"Januari",
		"Februari",
		"Maret",
		"April",
		"Mei",
		"Juni",
		"Juli",
		"Agustus",
		"September",
		"Oktober",
		"November",
		"Desember",
	}

	// get slice from array months index 4 to 7 (5th to 7th element)
	var slice1 = months[4:7]
	fmt.Println(slice1)      // Mei, Juni, Juli
	fmt.Println(len(slice1)) // length of slice
	fmt.Println(cap(slice1)) // capacity of slice

	//* modifying slice will also modify the underlying array
	//months[5] = "Diubah"
	//fmt.Println(slice1)

	//slice1[0] = "Mei Lagi"
	//fmt.Println(months)

	// create slice from index 11 to the end
	var slice2 = months[11:]
	fmt.Println(slice2)

	// append new value to the slice (will create a new array collection)
	var slice3 = append(slice2, "Luthfi")
	fmt.Println(slice3)
	slice3[1] = "Bukan_Desember"
	fmt.Println(slice3)

	// will not affect the original array because the capacity is exceeded
	fmt.Println(slice2)
	fmt.Println(months)

	// make function to create slice
	// make([]Type, length, capacity)
	newSlice := make([]string, 2, 5)

	newSlice[0] = "Muhammad"
	newSlice[1] = "Luthfi"

	fmt.Println(newSlice)
	fmt.Println(len(newSlice))
	fmt.Println(cap(newSlice))

	// copy slice
	copySlice := make([]string, len(newSlice), cap(newSlice))
	copy(copySlice, newSlice)
	fmt.Println(copySlice)

	// becareful when creating array and slice
	// don't be confused between array and slice
	// commonly developer golang use slice more than array because it's more flexible
	// array has a fixed length, while slice can grow dynamically
	iniArray := [5]int{1, 2, 3, 4, 5}
	iniSlice := []int{1, 2, 3, 4, 5}

	fmt.Println(iniArray)
	fmt.Println(iniSlice)
}