Method: Rubyvis::Nest#map

Defined in:
lib/rubyvis/nest.rb

#map ⇒ Object

Returns a hierarchical map of values. Each key adds one level to the hierarchy. With only a single key, the returned map will have a key for each distinct value of the key function; the correspond value with be an array of elements with that key value. If a second key is added, this will be a nested map. For example:

<pre>Rubyvis.nest(yields)

.key(function(d) d.variety)
.key(function(d) d.site)
.map()</pre>

returns a map m such that m[variety][site] is an array, a subset of yields, with each element having the given variety and site.



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# File 'lib/rubyvis/nest.rb', line 109

def map
  #i=0
  map={} 
  values=[]
  @array.each_with_index {|x,j|
    m=map
    (@keys.size-1).times {|i|
      k=@keys[i].call(x)
      m[k]={} if (!m[k])
      m=m[k]
    }
    k=@keys.last.call(x)
    if(!m[k])
      a=[]
      values.push(a)
      m[k]=a
    end
    m[k].push(x)
  }
  if(self.order)
    values.each_with_index {|v,vi|
      values[vi].sort!(&self.order)
    }
  end
  map
end