Class: Array

Inherits:
Object show all
Defined in:
parser/lib/uliska_parser/extensions.rb

Instance Method Summary (collapse)

Instance Method Details

- (Object) merge_by(array, column)

Merge array of hashes with similar array by one of the columns (if value for the key are the same). New rows in array2 ade added to self.



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# File 'parser/lib/uliska_parser/extensions.rb', line 26

def merge_by array, column
  self.each do |row|
    if mrg = array.find { |x| x[column] == row[column] } rescue nil
      row.merge!(array.delete(mrg))
    end
  end
  (self + array)
end

- (Object) sum

Calculate sum of a numeric (or what looks like numeric) array. Array elements must be numeric or by respond by to_f.



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# File 'parser/lib/uliska_parser/extensions.rb', line 14

def sum
  self.map(&:to_f).inject(0,:+)
end

- (Object) sum_by(key)

Find sum of column in array of hashes, by key in a hash



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# File 'parser/lib/uliska_parser/extensions.rb', line 19

def sum_by key
  self.map { |x| x[key] }.sum
end