how remove the last item of an array on ruby code example

Example 1: ruby pop array

a = [1, 2, 3, 4]
a.pop()
# => 4

Example 2: ruby remove value from array

# Altering the array:
a = [3, 2, 4, 6, 3, 8]
a.delete(3)
#=> 3
a
#=> [2, 4, 6, 8]

# Creating new array:
b = [3, 2, 4, 6, 3, 8]
b - [3]
#=> [2, 4, 6, 8]
b
#=> [3, 2, 4, 6, 3, 8]