These functions sort of act like clojure.core/reduce.
Order the items in the stream according to the provided function. If no function is provided, then a default sort order is used.
(q/query (g/get-vertices)
(q/property :name)
q/into-vec!)
;= ["lop" "vadas" "marko" "peter" "ripple" "josh"]
(q/query (g/get-vertices)
(q/property :name)
q/order
q/into-vec!)
;= ["josh" "lop" "marko" "peter" "ripple" "vadas"]
(q/query (g/get-vertices)
(q/property :name)
(q/order (fn [a b] (compare b a)))
q/into-vec!)
;= ["vadas" "ripple" "peter" "marko" "lop" "josh"]
Reverses the order of items in the stream.
(q/query (g/get-vertices)
(q/property :name)
q/order
q/into-vec!)
;= ["vadas" "ripple" "peter" "marko" "lop" "josh"]
Collect all objects up to that step and, optionally, process the gathered list with the provided function.
(q/query (g/find-by-id 1)
q/-->
q/id
q/gather
q/first-into-vec!)
;= ["2" "3" "4"]
(q/query (g/find-by-id 1)
q/-->
q/id
(q/gather count)
q/into-vec!)
;= [3]
You should read about filters next.
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