In Ruby, you can get the first and last elements of an array using the methods first and last, respectively.
Here is an example of how to get the first and last elements of an array:
# Defining an array
my_array = [1, 2, 3, 4, 5]
# Get first and last elements of the array
first_element = my_array.first
last_element = my_array.last
puts "The first element in the array is #{first_element}."
puts "The last element in the array is #{last_element}."
This would output:
The first element in the array is 1.
The last element in the array is 5.
You can also use an index to get the first and last element of an array. The first element has the index 0 while the last one has the index array.length - 1. Here is an example:
# Defining an array
my_array = [1, 2, 3, 4, 5]
# Get first and last elements of the array using the index
first_element = my_array[0]
last_element = my_array[my_array.length - 1]
puts "The first element in the array is #{first_element}."
puts "The last element in the array is #{last_element}."
This would output the same result as the previous example.