Class: ChunkDrill

Inherits:
Drill
  • Object
show all
Defined in:
lib/ruby_drills/array/chunk_drill.rb

Constant Summary

Constants included from Commands

Commands::GAMBLER

Instance Attribute Summary

Attributes inherited from Drill

#hints, #next, #previous

Instance Method Summary collapse

Methods inherited from Drill

#done?, #drills, #expected, #initialize, #non!

Methods included from Commands

#back, #clear, #continue, #fail, #fold, #help, #hint, #quit, #review, #skip, #welcome, #win

Constructor Details

This class inherits a constructor from Drill

Instance Method Details

#reference ⇒ Object 



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# File 'lib/ruby_drills/array/chunk_drill.rb', line 26

def reference
  "@names.sort.chunk {|n| n[0]}.map {|char, lines| [char, lines.size]}"
end

#setup ⇒ Object 



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# File 'lib/ruby_drills/array/chunk_drill.rb', line 3

def setup
  @names = %w[ Al Slartibartfast Aaron Yvonne Bobby ]
  @hints = ["Remember, this method is especially useful for sorted series of elements.",
            ".to_a can be useful to see the output of methods that produce Enumerators",
            "http://ruby-doc.org/core-1.9.3/Enumerable.html#method-i-chunk"]
end

#show ⇒ Object 



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# File 'lib/ruby_drills/array/chunk_drill.rb', line 10

def show
  puts %{
@names = #{@names.inspect}

Count the words in @names by the first letter of each name
to produce an array containing:
#{expected}

First sort this array, then use the method that splits self into
multiple Enumerators using the rule given in the block. It
then passes the result of the rule and an Enumerator
of the successive elements to another Enumerable method.

}
end

#valid?(input) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/ruby_drills/array/chunk_drill.rb', line 30

def valid?(input)
  ["chunk", "sort"].all? {|fn| input.include?(fn)}
end