Dynamic programming advantage

Want to show you some pieces of Ruby code that do the same thing.

Original version:

FIELDS = [ 'first', 'last',      'band' ]
DATA   = [['Kurt',  'Cobain',    'Nirvana'],
        ['Jimi',  'Page',      'Led Zeppelin'],
        ['Noel',  'Gallagher', 'Oasis'],
        ['Thom',  'Yorke',     'Radiohead']]

def combine_fields_and_data(fields, data)
new_data = []
data.each do |row|
  row_hash = {}
  row.each_with_index do |column, i|
    row_hash[fields[i].to_sym] = column
  end
  new_data.push(row_hash)
end
return new_data
end

And Adam's refactoring

def combine_fields_and_data(fields, data)
data.map { |row| Hash[*fields.zip(row).flatten] }
end

Adam code utilize Ruby built-in Array and Hash utilities that make his code extremely short.

Read more about Array utilities here.