smart-2map-reduce ( 2map-reduce-quots -- quot )

Vocabulary

combinators.smart

Inputs

2map-reduce-quots

a sequence

Outputs

None

Word description

A version of 2map-reduce that takes a sequence of { 2map-quot 2reduce-quot } pairs, returning the 2map-reduce result for each pair.

Definition

USING: assocs combinators generalizations kernel sequences ;

IN: combinators.smart

MACRO: smart-2map-reduce ( 2map-reduce-quots -- quot )
    [ keys ] [ [ [ ] concat-as ] [ ] map-as ] bi dup length dup
    [ [ [ [ first ] bi@ ] ] dip [ 2cleave ] curry compose ] 3dip
    [ [ [ cleave-curry ] [ cleave-curry ] bi ] curry compose ]
    dip [ spread* ] curry compose [ [ 2keep ] curry ] dip
    [ 1 2each-from ] curry compose ;