Functional Ruby - using map to create a new array from an existing array

functional-ruby.rb

# Looping through an array to form a new array

# non functional (imperative) way
my_array = [1,2,3,4,5]

new_array = [] # requires us to create a structure then modify it using push
my_array.each { | element |
  new_array.push("number " + element.to_s)
}

puts "New array:"
puts new_array

puts "My array remains unchanged:"
puts my_array


# a more functional way to approach the problem, we don't need to declare the
# sequence beforehand and we don't need array.push as map creates a new array for us

my_array = [1,2,3,4,5]

new_array = my_array.map { | element |
    "number " + element.to_s
}

puts "New array:"
puts new_array

puts "My array remains unchanged:"
puts my_array