butlast

Return a seq of all but the last item in coll, in linear time

cat

A transducer which concatenates the contents of each input, which must be a collection, into the reduction.

concat

Returns a lazy seq representing the concatenation of the elements in the supplied colls.

dedupe

Returns a lazy sequence removing consecutive duplicates in coll. Returns a transducer when no collection is provided.

distinct

Returns a lazy sequence of the elements of coll with duplicates removed. Returns a stateful transducer when no collectio...

doall

When lazy sequences are produced via functions that have side effects, any effects other than those needed to produce th...

dorun

When lazy sequences are produced via functions that have side effects, any effects other than those needed to produce th...

doseq

Repeatedly executes body (presumably for side-effects) with bindings and filtering as provided by "for". Does not retai...

drop

Returns a laziness-preserving sequence of all but the first n items in coll. Returns a stateful transducer when no colle...

drop-last

Return a lazy sequence of all but the last n (default 1) items in coll

drop-while

Returns a lazy sequence of the items in coll starting from the first item for which (pred item) returns logical false. ...

eduction

Returns a reducible/iterable application of the transducers to the items in coll. Transducers are applied in order as if...

filter

Returns a lazy sequence of the items in coll for which (pred item) returns logical true. pred must be free of side-effec...

filterv

Returns a vector of the items in coll for which (pred item) returns logical true. pred must be free of side-effects.

flatten

Takes any nested combination of sequential things (lists, vectors, etc.) and returns their contents as a single, flat se...

for

List comprehension. Takes a vector of one or more binding-form/collection-expr pairs, each followed by zero or more mo...

frequencies

Returns a map from distinct items in coll to the number of times they appear.

group-by

Returns a map of the elements of coll keyed by the result of f on each element. The value at each key will be a vector o...

interleave

Returns a lazy seq of the first item in each coll, then the second etc.

interpose

Returns a lazy seq of the elements of coll separated by sep. Returns a stateful transducer when no collection is provide...

into

Returns a new coll consisting of to-coll with all of the items of from-coll conjoined. A transducer may be supplied.

keep

Returns a lazy sequence of the non-nil results of (f item). Note, this means false return values will be included. f mu...

keep-indexed

Returns a lazy sequence of the non-nil results of (f index item). Note, this means false return values will be included....

map

Returns a lazy sequence consisting of the result of applying f to the set of first items of each coll, followed by apply...

map-indexed

Returns a lazy sequence consisting of the result of applying f to 0 and the first item of coll, followed by applying f t...

mapcat

Returns the result of applying concat to the result of applying map to f and colls. Thus function f should return a col...

mapv

Returns a vector consisting of the result of applying f to the set of first items of each coll, followed by applying f t...

merge

Returns a map that consists of the rest of the maps conj-ed onto the first. If a key occurs in more than one map, the m...

merge-with

Returns a map that consists of the rest of the maps conj-ed onto the first. If a key occurs in more than one map, the m...

nthnext

Returns the nth next of coll, (seq coll) when n is 0.

nthrest

Returns the nth rest of coll, coll when n is 0.

partition

Returns a lazy sequence of lists of n items each, at offsets step apart. If step is not supplied, defaults to n, i.e. th...

partition-all

Returns a lazy sequence of lists like partition, but may include partitions with fewer than n items at the end. Returns...

partition-by

Applies f to each value in coll, splitting it each time f returns a new value. Returns a lazy seq of partitions. Retur...

random-sample

Returns items from coll with random probability of prob (0.0 - 1.0). Returns a transducer when no collection is provide...

reduce

f should be a function of 2 arguments. If val is not supplied, returns the result of applying f to the first 2 items in ...

reduce-kv

Reduces an associative collection. f should be a function of 3 arguments. Returns the result of applying f to init, the ...

reductions

Returns a lazy seq of the intermediate values of the reduction (as per reduce) of coll by f, starting with init.

remove

Returns a lazy sequence of the items in coll for which (pred item) returns logical false. pred must be free of side-effe...

replace

Given a map of replacement pairs and a vector/collection, returns a vector/seq with any elements = a key in smap replace...

reverse

Returns a seq of the items in coll in reverse order. Not lazy.

rseq

Returns, in constant time, a seq of the items in rev (which can be a vector or sorted-map), in reverse order. If rev is ...

rsubseq

sc must be a sorted collection, test(s) one of <, <=, > or >=. Returns a reverse seq of those entries with keys ek for w...

run!

Runs the supplied procedure (via reduce), for purposes of side effects, on successive items in the collection. Returns n...

select-keys

Returns a map containing only those entries in map whose key is in keys

shuffle

Return a random permutation of coll

sort

Returns a sorted sequence of the items in coll. Comp can be boolean-valued comparison function, or a -/0/+ valued compar...

sort-by

Returns a sorted sequence of the items in coll, where the sort order is determined by comparing (keyfn item). Comp can ...

split-at

Returns a vector of [(take n coll) (drop n coll)]

split-with

Returns a vector of [(take-while pred coll) (drop-while pred coll)]

subseq

sc must be a sorted collection, test(s) one of <, <=, > or >=. Returns a seq of those entries with keys ek for which (te...

take

Returns a lazy sequence of the first n items in coll, or all items if there are fewer than n. Returns a stateful transd...

take-last

Returns a seq of the last n items in coll. Depending on the type of coll may be no better than linear time. For vector...

take-nth

Returns a lazy seq of every nth item in coll. Returns a stateful transducer when no collection is provided.

take-while

Returns a lazy sequence of successive items from coll while (pred item) returns logical true. pred must be free of side-...

transduce

reduce with a transformation of f (xf). If init is not supplied, (f) will be called to produce it. f should be a reducin...

tree-seq

Returns a lazy sequence of the nodes in a tree, via a depth-first walk. branch? must be a fn of one arg that returns tru...

update-keys

m f => {(f k) v ...} Given a map m and a function f of 1-argument, returns a new map whose keys are the result of applyi...

update-vals

m f => {k (f v) ...} Given a map m and a function f of 1-argument, returns a new map where the keys of m are mapped to r...