+
+
+: collect-assoc-by! ( ... assoc input-assoc quot: ( ... key value -- ... key' value' ) -- ... assoc )
+ rot [ '[ @ swap _ push-at ] assoc-each ] keep ; inline
+
+: collect-assoc-by ( ... input-assoc quot: ( ... key value -- ... key value ) -- ... assoc )
+ [ H{ } clone ] 2dip collect-assoc-by! ; inline
+
+: collect-key-by! ( ... assoc input-assoc quot: ( ... key -- ... new-key ) -- ... assoc )
+ rot [ '[ drop _ keep swap _ push-at ] assoc-each ] keep ; inline
+
+: collect-key-by ( ... input-assoc quot: ( ... key -- ... new-key ) -- ... assoc )
+ [ H{ } clone ] 2dip collect-key-by! ; inline
+
+: collect-value-by! ( ... assoc input-assoc quot: ( ... value -- ... new-key ) -- ... assoc )
+ rot [ '[ nip _ keep swap _ push-at ] assoc-each ] keep ; inline
+
+: collect-value-by ( ... input-assoc quot: ( ... value -- ... new-key ) -- ... assoc )
+ [ H{ } clone ] 2dip collect-value-by! ; inline
+
+
+: collect-assoc-by-multi! ( ... assoc input-assoc quot: ( ... key value -- ... new-keys value' ) -- ... assoc )
+ rot [ '[ @ swap _ B push-at-each ] assoc-each ] keep ; inline
+
+: collect-assoc-by-multi ( ... assoc quot: ( ... key value -- ... new-keys value' ) -- ... assoc )
+ [ H{ } clone ] 2dip collect-assoc-by-multi! ; inline
+
+: collect-key-by-multi! ( ... assoc input-assoc quot: ( ... key -- ... new-keys ) -- ... assoc )
+ rot [ '[ drop _ keep swap _ push-at-each ] assoc-each ] keep ; inline
+
+: collect-key-by-multi ( ... assoc quot: ( ... key -- ... new-keys ) -- ... assoc )
+ [ H{ } clone ] 2dip collect-key-by-multi! ; inline
+
+: collect-value-by-multi! ( ... assoc input-assoc quot: ( ... value -- ... new-keys ) -- ... assoc )
+ rot [ '[ nip _ keep swap _ push-at-each ] assoc-each ] keep ; inline
+
+: collect-value-by-multi ( ... assoc quot: ( ... value -- ... new-keys ) -- ... assoc )
+ [ H{ } clone ] 2dip collect-value-by-multi! ; inline