package main

import (
	"fmt"
	"sort"
	"strings"
)

func arraysAndSorting() {

	Divider("arrays")

	// Arrays in GOLang start at 0!!!

	// Three ways to initialize arrays
	// you can either define the length in the [x]type part
	// or let it determine the amount based on the number of entries given
	var ages [3]int = [3]int{16, 17, 18}
	var moreAges = [3]int{21, 22, 23}
	names := [4]string{"mario", "luigi", "peach", "yoshi"}

	fmt.Println(ages, len(moreAges), names) // len() function gets the length or size of array

	// slices (use arrays under the hood)
	var scores = []int{100, 50, 60}
	scores[2] = 25
	scores = append(scores, 85)

	fmt.Println(scores, len(scores))

	// slice ranges
	rangeOne := names[1:3]

	fmt.Println(rangeOne)

	Divider("standard library")

	// strings package

	greeting := "hello there"
	fmt.Println(strings.Contains(greeting, "hello")) // strings.Contains returns a boolean value depending on if the passed value contains the second string
	fmt.Println(strings.Contains(greeting, "Hello")) // This function IS case-sensitive

	fmt.Println(strings.ReplaceAll(greeting, "hello", "hi")) // Replaces all instances of the passed string
	fmt.Println("Original string value is", greeting)        // the original value is unchanged
	fmt.Println(strings.ToUpper(greeting))                   // returns the passed string all uppercase

	fmt.Println(strings.Index(greeting, "ll")) // returns the first found position of the passed string

	fmt.Println(strings.Split(greeting, " ")) // splits first passed string into an array at each of the second passed variables instances

	// sort package

	otherAges := []int{45, 20, 35, 30, 75, 60, 50, 25}

	sort.Ints(otherAges) // sorts given values AND stores it in the same variable
	fmt.Println(otherAges)

	index := sort.SearchInts(otherAges, 30) // gets the index of the passed value from the array first passed
	secondIndex := sort.SearchInts(otherAges, 90) // if the value passed is not found in the array, it will return what position it WOULD be in
	thirdIndex := sort.SearchInts(otherAges, 55)
	fmt.Println(index)
	fmt.Println(secondIndex)
	fmt.Println(thirdIndex)

	otherNames := []string{"mario", "luigi", "yoshi", "peach", "bowser"}

	sort.Strings(otherNames)
	fmt.Println(otherNames)

	fmt.Println(sort.SearchStrings(otherNames, "bowser")) // gives the position of the passed string in the array if found
	fmt.Println(sort.SearchStrings(otherNames, "waluigi")) // otherwise will return where it WOULD be

}