city => units is a map. Symbols as keys are common.
Goal
Puts Nairobi units from a hash.
units = { "Nairobi" => 12, "Mombasa" => 8 }
puts units["Nairobi"]row = { city: "Kisumu", units: 5 }
puts row[:city]
puts row[:units]kiosks = { Nairobi: 12, Kisumu: 5 }
kiosks[:Eldoret] = 3
puts kiosks.inspectrow = { city: "Nakuru", sale: { units: 4, price: 40 } }
puts row[:sale][:units]