Module: Spruz::Subhash

### Home Classes Methods

### In Files

- lib/spruz/subhash.rb

### Methods

- #subhash

### Files

- README.rdoc

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# Spruz::Subhash

### Public Instance Methods

subhash(*patterns) click to toggle source

Create a subhash from this hash, that only contains key-value pairs matching `patterns` and return it. `patterns` can be for example /^foo/ to put 'foobar' and 'foobaz' or 'foo'/:foo to put 'foo' into the subhash.

If a block is given this method yields to it after the first pattern matched with a 3-tuple of +(key, value, match_data)+ using the return value of the block as the value of the result hash. `match_data` is a MatchData instance if the matching pattern was a regular rexpression otherwise it is nil.

    # File lib/spruz/subhash.rb, line 12
    def subhash(*patterns)
      patterns.map! do |pat|
        pat = pat.to_sym.to_s if pat.respond_to?(:to_sym)
        pat.respond_to?(:match) ? pat : pat.to_s
      end
      result =
        if default_proc
          self.class.new(&default_proc)
        else
          self.class.new(default)
        end
      if block_given?
        each do |k, v|
          patterns.each { |pat|
            if pat === k.to_s
              result[k] = yield(k, v, $~)
              break
            end
          }
        end
      else
        each do |k, v|
          result[k] = v if patterns.any? { |pat| pat === k.to_s }
        end
      end
      result
    end

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