/*
Slices: https://www.youtube.com/watch?v=CF9S4QZuV30&t=1139s#
Syntax: 0:3 - a slice capturing the first index up to then 3rd index
*/

package main

import "fmt"

func main() {
	/*
		A slice is like an array but when you define them
		you leave out the size
	*/

	//define an array without a static size of type 'int' and assign values
	numSlice := []int{5, 4, 3, 2, 1}

	/*
		define a variable containing the pre-created array and
		start at the 3rd index going through the 5th
		(Indexes start at 0 here as well)
	*/
	numSlice2 := numSlice[3:5]

	fmt.Println("numSlice2[0] =", numSlice2[0])
	fmt.Println("numSlice2[1] =", numSlice2[1])

	/*
		If you do not supply the first number before the colon
		the first number will default to index (0)
		the result is everyting before index 2
	*/
	fmt.Println("numSlice[:2] =", numSlice[:2])

	/*
		The opposite is true if you do not supply the second number
		the result is everything after index 2
	*/
	fmt.Println("numSlice[2:] =", numSlice[2:])

	/*
		To create a slice without set values, you need to use 'make'
		If you want index 0 to start at index 5 and set a max
		length of 10:
	*/

	numSlice3 := make([]int, 5, 10)

	/*
		numSlice3 at this point is empty since no values were assigned
		but we can copy the values of numSlice with 'copy'
	*/
	copy(numSlice3, numSlice)

	/*
		Since numSlice3 begins at index 5, index 0 will output the
		5th index of 'numSlice' which was copied into numSlice3
	*/
	fmt.Println("numSlice3[0] =", numSlice3[0])
	fmt.Println("numSlice3[1] =", numSlice3[1])

	/*
		Since we gave numSlice3 a maximum of 10 possible indexes
		we can append more values than the original 'numSlice' variable
		which was only 5 indexes originally
	*/

	//append the values '0', and '-1' to the next available indexes ( 5 and 6)
	numSlice3 = append(numSlice3, 0, -1)

	fmt.Println("numSlice3[5] =", numSlice3[5])
	fmt.Println("numSlice3[6] =", numSlice3[6])
}