code: function pluck(seq, attr) {
          return map(seq, function(value) {
              return objp(value)?  value[attr]
                   : /* nil? */    undefined })
      }
docs: /// Function pluck ///////////////////////////////////////////////////////  (seq:Sequence, attr:String) ↦ Array  Returns a sequence with all elements replaced by their attribute `attr`.  Non-object items are mapped to `undefined`.