It Lastor

// Get the last element or fallback value
numbers := it.Slice([]int{5, 2, 8, 1, 9})
last := it.LastOr(numbers, 42)
// last: 9

// With empty collection
empty := it.Slice([]int{})
last := it.LastOr(empty, 42)
// last: 42 (fallback value)

// With strings
words := it.Slice([]string{"hello", "world", "go"})
last := it.LastOr(words, "fallback")
// last: "go"

emptyWords := it.Slice([]string{})
last := it.LastOr(emptyWords, "fallback")
// last: "fallback"

// With structs
type Person struct {
    Name string
    Age  int
}
people := it.Slice([]Person{
    {Name: "Alice", Age: 30},
    {Name: "Bob", Age: 25},
})
last := it.LastOr(people, Person{Name: "Default", Age: 0})
// last: {Name: "Bob", Age: 25}

emptyPeople := it.Slice([]Person{})
last := it.LastOr(emptyPeople, Person{Name: "Default", Age: 0})
// last: {Name: "Default", Age: 0} (fallback value)

// With single element
single := it.Slice([]int{42})
last := it.LastOr(single, 99)
// last: 42

// Using with nil pointer fallback
values := it.Slice([]*string{ptr("hello"), ptr("world")})
last := it.LastOr(values, nil)
// last: pointer to "world"

emptyValues := it.Slice([]*string{})
last := it.LastOr(emptyValues, nil)
// last: nil (fallback value)