Sort an array alphabetically in Ruby but with capitalised words at the end

1、["Apple",
"banana",
"Zebra",
"orange"].sort_by(&:swapcase)

Probably
not a concern, but ["iPhone",
"item"].sort_by(&:swapcase) #=> ["item", "iPhone"]

["IRB",
"It"].sort_by(&:swapcase) #=> ["It", "IRB"]

arr = %w{ Apple banana Zebra Camel iPhone waffles Pancakes }
# => ["Apple", "banana", "Zebra", "Camel", "iPhone", "waffles", "Pancakes"]

arr.sort.rotate(arr.count { |s| s[/^[A-Z]/] })
# => ["banana", "iPhone", "waffles", "Apple", "Camel", "Pancakes", "Zebra"]

a = arr.sort
# => ["Apple", "Camel", "Pancakes", "Zebra", "banana", "iPhone", "waffles"]

nbr_capitalized_words = arr.count { |s| s[/^[A-Z]/] }
#=> 4

a.rotate(nbr_capitalized_words)
#=> ["banana", "iPhone", "waffles", "Apple", "Camel", "Pancakes", "Zebra"]

3、["banana", "Banana","orange", "Apple", ].sort_by{|x| [x[0].upcase==x[0] ? 1:0,x] }