package learning

import "fmt"

func SlicesLearning() {
	primes := [6]int{2, 3, 5, 7, 11, 13}
	var s []int = primes[1:4]
	var ss []int = primes[:]
	fmt.Println(s)
	fmt.Println(ss)
}

func SliceEnhanced() {
	s := []int{2, 3, 5, 7, 11, 13}
	printSlice(s)

	// Slice the slice to give it zero length.
	s = s[:0]
	printSlice(s)

	// Extend its length.
	s = s[:4]
	printSlice(s)

	// Drop its first two values.
	s = s[2:]
	printSlice(s)
}

func printSlice(s []int) {
	fmt.Printf("len=%d cap=%d %v\n", len(s), cap(s), s)
}

func SlicesMake() {
	a := make([]int, 5)
	printSliceMake("a", a)

	b := make([]int, 0, 5)
	printSliceMake("b", b)

	c := b[:2]
	printSliceMake("c", c)

	d := c[2:5]
	printSliceMake("d", d)
}

func printSliceMake(s string, x []int) {
	fmt.Printf("%s len=%d cap=%d %v\n",
		s, len(x), cap(x), x)
}