challenge is to add ',' at the end of every number which is not pin-code. Pincodes are the number lesser or equal to 5.

add_comma_to_phone_numbers_string.rb

# challenge is to add ',' at the end of every number which is not pin-code. Pincodes are the number lesser or equal to 5.
# Also, make sure they all are one space apart.
# ex: "123 23424324 34534 2342442234"
# function should return: "123 23424324, 34534 2342442234,"
#
a = "1234 23434242   232342442 345 2342341234"
a.scan(/[\w']+/) do |w|
 if w.length > 5
b << "#{w},"
next
 end
b << w
end
=> "1234 23434242   232342442 345 2342341234"
b
=> ["1234", "23434242,", "232342442,", "345", "2342341234,"]
b.join(' ')
=> "1234 23434242, 232342442, 345 2342341234,"