(append! acc x)
.adds x to acc and returns acc
(cat left right)
A high-performance combining fn that yields the catenation of the reduced values. The result is reducible, foldable, seqable and counted, providing the identity collections are reducible, seqable and counted. The single argument version will build a combining fn with the supplied identity constructor. Tests for identity with (zero? (count x)). See also foldcat.
(drop n coll)
Elides the first n values from the reduction of coll.
(filter pred coll)
Retains values in the reduction of coll for which (pred val) returns logical true. Foldable.
Takes any nested combination of sequential things (lists, vectors, etc.) and returns their contents as a single, flat foldable collection.
(fold reducef coll)
(fold combinef reducef coll)
(fold n combinef reducef coll)
Reduces a collection using a (potentially parallel) reduce-combine strategy. The collection is partitioned into groups of approximately n (default 512), each of which is reduced with reducef (with a seed value obtained by calling (combinef) with no arguments). The results of these reductions are then reduced with combinef (default reducef). combinef must be associative, and, when called with no arguments, (combinef) must produce its identity element. These operations may be performed in parallel, but the results will preserve order. Note: Performing operations in parallel is currently not implemented.
Equivalent to (fold cat append! coll)
(folder coll xf)
Given a foldable collection, and a transformation function xf, returns a foldable collection, where any supplied reducing fn will be transformed by xf. xf is a function of reducing fn to reducing fn.
(map f coll)
Applies f to every value in the reduction of coll. Foldable.
(mapcat f coll)
Applies f to every value in the reduction of coll, concatenating the result colls of (f val). Foldable.
(monoid op ctor)
Builds a combining fn out of the supplied operator and identity constructor. op must be associative and ctor called with no args must return an identity value for it.
(reduce f coll)
(reduce f init coll)
Like core/reduce except: When init is not provided, (f) is used. Maps are reduced with reduce-kv
(reducer coll xf)
Given a reducible collection, and a transformation function xf, returns a reducible collection, where any supplied reducing fn will be transformed by xf. xf is a function of reducing fn to reducing fn.
(remove pred coll)
Removes values in the reduction of coll for which (pred val) returns logical true. Foldable.
(take n coll)
Ends the reduction of coll after consuming n values.
(take-while pred coll)
Ends the reduction of coll when (pred val) returns logical false.
(Cat. cnt left right)