Module: DataTools::Array

Defined in:
lib/data_tools/array.rb

Instance Method Summary collapse

Instance Method Details

#dumpme(filename) ⇒ Object

marshal (ruby-specific binary format) the contents of this structure to a file fails if file exists



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# File 'lib/data_tools/array.rb', line 31

def dumpme(filename)
  raise "#{filename} exists" if File.exists?(filename)
  File.open(filename, "w") {|f| f << Marshal.dump(self)}
end

#dumpme!(filename) ⇒ Object

same as #dumpme but overwrites existing file



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# File 'lib/data_tools/array.rb', line 36

def dumpme!(filename)
  File.unlink(filename) if File.exists?(filename)
  File.open(filename, "w") {|f| f << Marshal.dump(self)}
end

#hashify(headers = shift) ⇒ Object

turns an array-of-arrays into an array-of-hashes the headers are used as names for the fields OK for rows to have fewer fields than the header record, but must not be longer



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# File 'lib/data_tools/array.rb', line 5

def hashify(headers = shift)
  # ignore leading/trailing whitespace in header labels
  headers.each {|hdr| hdr.strip! if hdr === String}
  select {|row| row.any?}.map do |row|
    raise "Row count mismatch: #{row}" if row.count > headers.count
    hash = {}
    row.zip(headers) do |v,k|
      # ignore any keys with missing values
      # remove leading/trailing whitespace from values
      hash[k] = v.strip unless v.blank?
    end
    hash
  end
end

#resolve(&block) ⇒ Object

ARRAY OF SCALARS apply an operation (block) to every member of the array return the list of unique results if there is just one result, convert to a scalar value



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# File 'lib/data_tools/array.rb', line 24

def resolve(&block)
  values = map {|v| block.call(v)}.uniq
  values.count <= 1 ? values.first : values
end