LeetCode_AddTwoNumbers/main.go

package main

import (
	"errors"
	"fmt"
	"strconv"
)

type ListNode struct {
	Val  int
	Next *ListNode
}

func (l *ListNode) Add(val int) {
	newNode := &ListNode{Val: val}
	current := l
	for current.Next != nil {
		current = current.Next
	}
	current.Next = newNode
}
func (l *ListNode) Get(index int) (int, error) {
	current := l
	for i := 0; i < index; i++ {
		if current.Next != nil {
			current = current.Next
		} else {
			return 0, errors.New("there is nothing to index at")
		}

	}
	return current.Val, nil
}
func (l *ListNode) GetNr() int {
	res := 0
	multiplier := 1
	current := l
	for current.Next != nil {
		res = res + (current.Val * multiplier)
		multiplier = multiplier * 10
		current = current.Next
	}
	res = res + (current.Val * multiplier)
	return res
}
func (l *ListNode) Length() int {
	count := 0
	if l.Val != 0 {
		count++
	}
	current := l
	for current.Next != nil {
		current = current.Next
		count++
	}
	return count
}

func addTwoNumbers(l1 *ListNode, l2 *ListNode) *ListNode {
	s2 := strconv.Itoa(l1.GetNr() + l2.GetNr())
	a := []rune(s2)
	head := &ListNode{Val: 0}
	res := head

	for _, r := range a {
		nr, err := strconv.Atoi(string(r))
		if err != nil {
			panic("lol")
		}
		res.Next = &ListNode{Val: nr}
		res = res.Next

	}
	return head.Next
}

func main() {
	l1 := ListNode{Val: 2}
	l1.Add(4)
	l1.Add(3)
	l2 := ListNode{Val: 5}
	l2.Add(6)
	l2.Add(4)
	l3 := addTwoNumbers(&l1, &l2)
	fmt.Println(l3.GetNr())
}