Method: Array#transpose

Defined in:
ext/enterprise_script_service/mruby/mrbgems/mruby-array-ext/mrblib/array.rb

#transpose ⇒ Object

call-seq:

ary.transpose -> new_ary

Assumes that self is an array of arrays and transposes the rows and columns.

If the length of the subarrays don’t match, an IndexError is raised.

Examples:

a = [[1,2], [3,4], [5,6]]
a.transpose   #=> [[1, 3, 5], [2, 4, 6]]



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# File 'ext/enterprise_script_service/mruby/mrbgems/mruby-array-ext/mrblib/array.rb', line 903

def transpose
  return [] if empty?

  column_count = nil
  self.each do |row|
    raise TypeError unless row.is_a?(Array)
    column_count ||= row.size
    raise IndexError, 'element size differs' unless column_count == row.size
  end

  Array.new(column_count) do |column_index|
    self.map { |row| row[column_index] }
  end
end