method

index

Ruby latest stable (v1_9_3_392) - 0 notes - Class: Matrix

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1_9_3_125 (0)
1_9_3_392 (0)
What's this?

index(*args) public

The index method is specialized to return the index as [row, column] It also accepts an optional selector argument, see #each for details.

Matrix[ [1,2], [3,4] ].index(&:even?) # => [0, 1]
Matrix[ [1,1], [1,1] ].index(1, :strict_lower) # => [1, 0]

Show source

# File lib/matrix.rb, line 526
  def index(*args)
    raise ArgumentError, "wrong number of arguments(#{args.size} for 0-2)" if args.size > 2
    which = (args.size == 2 || SELECTORS.include?(args.last)) ? args.pop : :all
    return to_enum :find_index, which, *args unless block_given? || args.size == 1
    if args.size == 1
      value = args.first
      each_with_index(which) do |e, row_index, col_index|
        return row_index, col_index if e == value
      end
    else
      each_with_index(which) do |e, row_index, col_index|
        return row_index, col_index if yield e
      end
    end
    nil
  end

index

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