method

block_scanf

Ruby latest stable (v2_5_5) - 0 notes - Class: String

block_scanf(fstr) public

Scans the current string until the match is exhausted yielding each match as it is encountered in the string. A block is not necessary as the results will simply be aggregated into the final array.

"123 456".block_scanf("%d")
# => [123, 456]

If a block is given, the value from that is returned from the yield is added to an output array.

"123 456".block_scanf("%d) do |digit,| # the ',' unpacks the Array
  digit + 100
end
# => [223, 556]

See Scanf for details on creating a format string.

You will need to require ‘scanf’ to use String#block_scanf

Show source

# File lib/scanf.rb, line 753
  def block_scanf(fstr) #:yield: current_match
    fs = Scanf::FormatString.new(fstr)
    str = self.dup
    final = []
    begin
      current = str.scanf(fs)
      final.push(yield(current)) unless current.empty?
      str = fs.string_left
    end until current.empty? || str.empty?
    return final
  end

block_scanf

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