powerseq
v2.0.3
Published
Sequence operators
Downloads
616
Readme
Documentation
import { pipe, range, filter, take, toarray } from "powerseq"; // npm install powerseq
// calling one operator
for(var item of filter([1,2,3,4,5], x => x % 2 === 0)){
console.log(item);
}
// chaining many operators
const items = pipe(range(1, Number.MAX_VALUE), filter(x => x % 2 === 0), take(5), toarray());
console.log(items);
- thanks to function overloading the same operator can be called alone or as a part of
pipe(..., operator(), ...)
expression - for some operators a special counterparts ending with
p
are provided (concatp
,defaultifemptyp
,includesp
,sequenceequalp
,zipp
,interleavep
), those functions must be used insidepipe(..., opp())
, so we callconcat([1,2,3], [4,5,6])
orpipe([1,2,3], concatp([4,5,6]) )
- mapping powerseq operators to LINQ, RxJS, JS Array, lodash, F#, Clojure, Kotlin, Java
- read Programming with sequences series to better understand iterators and generators in JS, it also presents how to implement powerseq operators from scratch
functions
- creators: defer, empty, entries, generate, range, repeatvalue, throww
- operators: average, buffer, cast, combinations, concat, count, countby, defaultifempty, distinct, distinctby, distinctuntilchanged, doo, elementat, every, except, exceptby, expand, filter, filtermap, find, findindex, flat, flatmap, foreach, groupby, groupbytoobject, groupbytotransformedobject, groupjoin, ignoreelements, includes, interleave, interpose, intersect, intersectby, isempty, join, last, map, max, maxby, memoize, min, minby, oftype, orderby, orderbydescending, pairwise, partitionby, reduce, repeat, reverse, scan, sequenceequal, share, single, skip, skiplast, skipwhile, some, sum, take, takelast, takewhile, thenby, thenbydescending, toarray, tomap, toobject, union, unionby, zip
creators
defer
defer(() => [1, 2, 3] /* executed on demand */)
->seq [1, 2, 3]
empty
empty()
->seq []
entries
entries({ 'a': 1, b: 2 })
->seq [['a', 1], ['b', 2]]
entries([1, 2, 3])
->seq [[0, 1], [1, 2], [2, 3]]
generate
generate(0, x => x < 4, x => x + 1, x => 'a'.repeat(x))
->seq ['', 'a', 'aa', 'aaa']
range
range(10, 4)
->seq [10, 11, 12, 13]
repeatvalue
repeatvalue(true, 4)
->seq [true, true, true, true]
take(repeatvalue(true), 2)
->seq [true, true]
throww
throww(new Error('exception ...'))
->error: exception ...
operators
average
average([1, 2, 3, 4])
->2.5
average(['a', 'aa', 'aaa'], s => s.length)
->2
average(['a', 'aa', ''], (s, index) => s.length + index)
->2
buffer
buffer([1, 2, 3, 4, 5, 6, 7], 2)
->seq [[1, 2], [3, 4], [5, 6], [7]]
buffer([1, 2, 3, 4, 5, 6, 7], 2, /*skip*/ 4)
->seq [[1, 2], [5, 6]]
cast
cast([new Number(1), new Number(2), 's', false], Number)
->error: An element in the sequence cannot be cast to type 'Number'.
combinations
combinations([1, 2, 3, 4], 2)
->seq [[1, 2], [1, 3], [2, 3], [1, 4], [2, 4], [3, 4]]
combinations([1, 2, 3, 4], 3)
->seq [[1, 2, 3], [1, 2, 4], [1, 3, 4], [2, 3, 4]]
concat
concat([1, 2], [3, 5], [6])
->seq [1, 2, 3, 5, 6]
count
count([2, 2, 2])
->3
count([2, 4, 6], x => x > 2)
->2
count([2, 4, 6], (x, index) => index >= 2)
->1
countby
countby(['a', 'a', 'cc', 'ddd', 'xx'], x => x.length)
->Map {1 => 2, 2 => 2, 3 => 1}
pipe(['a', 'a', 'cc', 'ddd', 'xx'], countby(x => x), toobject())
->{ a:2, cc:1, ddd:1, xx:1 }
defaultifempty
defaultifempty([1, 2, 3])
->seq [1, 2, 3]
defaultifempty([])
->seq [undefined]
defaultifempty([], 10)
->seq [10]
distinct
distinct([1, 2, 1, 3, 2])
->seq [1, 2, 3]
distinct(['a', 'aa', 'ab', 'abc'], x => x.length)
->seq [1, 2, 3]
distinctby
distinctby(['a', 'aa', 'ab', 'abc'], x => x.length)
->seq ['a', 'aa', 'abc']
distinctuntilchanged
distinctuntilchanged([1, 1, 2, 2, 2, 1, 3, 3])
->seq [1, 2, 1, 3]
doo
doo([1, 2, 3,], x => { })
->seq [1, 2, 3]
elementat
elementat([1, 2, 12, 15], 2)
->12
elementat([1, 2, 12, 15], 20)
->undefined
elementat([1, 2, 12, 15], 20, 100)
->100
every
every([1, 2, 12, 15], x => x > 0)
->true
every([1, 2, 12, 15], x => x < 10)
->false
every([0, 1, 3, 3], (x, index) => x === index)
->false
except
except([1, 2, 2, 3, 4], [2, 3])
->seq [1, 4]
exceptby
exceptby(['a', 'b', 'ba', 'xde'], ['poc'], x => x.length)
->seq ['a', 'ba']
expand
expand([1], x => x > 8 ? [] : [10, x * 2])
->seq [1, 10, 2, 10, 4, 10, 8, 10, 16]
filter
filter([1, 2, 2, 3, 4], x => x > 2)
->seq [3, 4]
filter([1, 2, 2, 3, 4], (x, index) => x - 1 === index)
->seq [1, 2]
filtermap
filtermap([1, 2, 3, 4], x => x % 2 === 0 ? (x * 10).toString() : null)
->seq ['20', '40']
filtermap([1, 2, 3, 4], (x, i) => i % 2 === 0 ? (x * 10).toString() : null)
seq ['10', '30']
find
find([1, 2, 2, 3, 4])
->1
find([1, 2, 2, 3, 4], x => x > 2)
->3
find([1, 2, 2, 3, 4], x => x > 4)
->undefined
find([1, 2, 2, 3, 4], x => x > 4, 100)
->100
find([1, 2, 2, 3, 4], (x, index) => x > 1 && index > 2)
->3
findindex
findindex([1, 2, 2, 3, 4], x => x > 1)
->1
findindex([1, 2, 2, 3, 4], (x, index) => index > 1)
->2
findindex([1, 2, 2, 3, 4], (x, index) => x > 1 && index > 2)
->3
flat
flat([1, [2, 3], [[4, 5], 6], []])
->seq [1, 2, 3, [4, 5], 6]
flat([1, [2, 3], [[4, 5], 6], []], 1)
->seq [1, 2, 3, [4, 5], 6]
flat([1, [2, 3], [[4, 5], 6], []], 2)
->seq [1, 2, 3, 4, 5, 6]
flat(['a', ['b', ['c', 'd']], 'e'], (item, depth) => typeof item !== 'string')
seq ['a', 'b', 'c', 'd', 'e']
flatmap
flatmap([{ ns: [1] }, { ns: [99, 10] }, { ns: [6, 3] }], x => x.ns)
->seq [1, 99, 10, 6, 3]
flatmap([{ ns: [1] }, { ns: [99, 10] }, { ns: [6, 3] }], (x, index) => x.ns.map(n => [index, n]))
seq [[0, 1], [1, 99], [1, 10], [2, 6], [2, 3]]
flatmap(['abc', 'cd'], text => text, (text, char, index) => `${index}. ${char} (${text})`)
seq ['0. a (abc)', '1. b (abc)', '2. c (abc)', '3. c (cd)', '4. d (cd)']
foreach
foreach([1, 2, 3], x => { /* some action */ ; })
->undefined
groupby
groupby(['a', 'b', 'cc', 'ddd', 'xx'], x => x.length)
->Map {1 => ['a', 'b'], 2 => ['cc', 'xx'], 3 => ['ddd']}
groupby(['a', 'b', 'cc', 'ddd', 'xx'], x => x.length, x => x.toUpperCase())
Map {1 => ['A', 'B'], 2 => ['CC', 'XX'], 3 => ['DDD']}
groupby(['a', 'b', 'cc', 'ddd', 'xx'], x => x.length, (x, k) => k)
->Map {1 => [1, 1], 2 => [2, 2], 3 => [3]}
pipe(['a', 'b', 'cc', 'ddd', 'xx'], groupby(x => x.length), map(([key, values]) => ({ key, values })))
seq [{ key:1, values:['a', 'b'] }, { key:2, values:['cc', 'xx'] }, { key:3, values:['ddd'] }]
pipe(['a', 'b', 'cc', 'ddd', 'xx'], groupby(x => x.length), toobject())
{ 1:['a', 'b'], 2:['cc', 'xx'], 3:['ddd'] }
groupbytoobject
groupbytoobject(['a', 'bb', 'ccc', 'e', 'ff'], x => x.length)
->{ 1:['a', 'e'], 2:['bb', 'ff'], 3:['ccc'] }
groupbytoobject(['a', 'bb', 'ccc', 'e', 'ff'], x => x.length, x => x.toUpperCase())
{ 1:['A', 'E'], 2:['BB', 'FF'], 3:['CCC'] }
groupbytoobject(['a', 'bb', 'ccc', 'e', 'ff'], x => x.length, x => x.length)
{ 1:[1, 1], 2:[2, 2], 3:[3] }
groupbytoobject(['a', 'bb', 'ccc', 'e', 'ff'], x => x.length, (x, key) => x + key)
{ 1:['a1', 'e1'], 2:['bb2', 'ff2'], 3:['ccc3'] }
groupbytotransformedobject
groupbytotransformedobject(['a', 'bb', 'ccc', 'e', 'ff'], x => x.length, xs => xs.join(','))
{ 1:'a,e', 2:'bb,ff', 3:'ccc' }
groupbytotransformedobject(['a', 'bb', 'ccc', 'e', 'ff'], x => x.length, xs => xs.length)
{ 1:2, 2:2, 3:1 }
groupjoin
groupjoin([1, 3, 2, 1], ['a', 'b', 'cc'], x => x, y => y.length, (x, ys) => x + ':' + ys)
seq ['1:a,b', '3:', '2:cc', '1:a,b']
ignoreelements
ignoreelements([1, 3, 2])
->seq []
includes
includes([1, 2, 3], 2)
->true
includes([1, 2, 3], 5)
->false
includes([1, 2, 3], 3, /*fromIndex*/ 4)
->false
interleave
interleave([1, 2, 3], [10, 20])
->seq [1, 10, 2, 20]
interleave([-1], [1, 2, 3], [10, 20])
->seq [-1, 1, 10]
interleave([1, 2, 3])
->seq [1, 2, 3]
interpose
interpose([1, 2, 3], 0)
->seq [1, 0, 2, 0, 3]
interpose([1], 0)
->seq [1]
interpose([], 0)
->seq []
intersect
intersect([1, 2, 2, 3], [3, 3, 1])
->seq [3, 1]
intersectby
intersectby(['a', 'c', 'ddd'], ['r', 'ww', 'ttt', 'oooo'], x => x.length)
seq ['r', 'ttt']
isempty
isempty([])
->true
isempty([1, 2])
->false
join
join([1, 2, 3], ['a', 'bb', 'x'], x => x, y => y.length, (x, y) => x + ':' + y)
seq ['1:a', '1:x', '2:bb']
last
last([1, 2, 3])
->3
last([])
->undefined
last([1, 2, 3, 4, 5], x => x > 2)
->5
last([1, 2, 3, 4, 5], (x, index) => x > 2 && index < 4)
->4
last([1, 2, 3, 4, 5], x => x > 10)
->undefined
last([1, 2, 3, 4, 5], x => x > 10, -1)
->-1
map
map([1, 2, 3], x => x * 10)
->seq [10, 20, 30]
map([1, 2, 3], (x, index) => x * 10 + index)
->seq [10, 21, 32]
max
max([1, 2, 3, 1])
->3
max(['a', 'bb', 'rrr', 'd'], x => x.length)
->3
maxby
maxby(['a', 'bb', 'rrr', 'd'], x => x.length)
->'rrr'
maxby(['a', 'bb', 'rrr', 'd'], (x, index) => x.length * index)
->'rrr'
memoize
pipe(range(0, 4), map(i => ({ i })), memoize(), xs => zip(xs, xs, (x1, x2) => [x1.i, x2.i, x1 === x2]))
seq [[0, 0, true], [1, 1, true], [2, 2, true], [3, 3, true]]
min
min([1, 2, 3, 1])
->1
min(['a', 'bb', 'rrr', 'd'], x => x.length)
->1
min(['a', 'bb', 'rrr', 'd'], (x, index) => x.length * index)
->0
minby
minby(['a', 'bb', 'rrr', 'd'], x => x.length)
->'a'
minby(['a', 'bb', 'rrr', 'd'], (x, index) => x.length * index)
->'a'
oftype
oftype([new Number(1), new Number(2), 's', false], Number)
->seq [{ }, { }]
orderby
orderby([1, 4, 2, 3, 5, 1], x => x)
->seq [1, 1, 2, 3, 4, 5]
orderby(['abc', 'dd', 'sdfe', 'f'], x => x.length)
->seq ['f', 'dd', 'abc', 'sdfe']
orderbydescending
orderbydescending([1, 4, 2, 3, 5, 1], x => x)
->seq [5, 4, 3, 2, 1, 1]
orderbydescending(['abc', 'dd', 'sdfe', 'f'], x => x.length)
->seq ['sdfe', 'abc', 'dd', 'f']
pairwise
pairwise([1, 2, 3, 4])
->seq [[1, 2], [2, 3], [3, 4]]
pairwise([1, 2])
->seq [[1, 2]]
pairwise([1])
->seq []
pairwise([])
->seq []
partitionby
partitionby([1, 2, 4, 6, 3, 4], n => n % 2 === 0)
->seq [[1], [2, 4, 6], [3], [4]]
reduce
reduce([1, 2, 3], (a, x) => a + x)
->6
reduce([1, 2, 3], (a, x) => a + (x * 10), '')
->'102030'
repeat
repeat([1, 2, 3], 2)
->seq [1, 2, 3, 1, 2, 3]
take(repeat([1, 2, 3]), 5)
->seq [1, 2, 3, 1, 2]
reverse
reverse([1, 2, 3])
->seq [3, 2, 1]
scan
scan([1, 2, 3], (a, x) => a + x)
->seq [3, 6]
scan([1], (a, x) => a + x)
->seq []
scan([1, 2, 3], (a, x) => a + (x * 10), '')
->seq ['', '10', '1020', '102030']
scan([1], (a, x) => a + (x * 10), '')
->seq ['', '10']
scan([], (a, x) => a + (x * 10), '')
->seq ['']
sequenceequal
sequenceequal([1, 2, 3], [1, 2, 3])
->true
sequenceequal([1, 2, 3], [1, 2, 2])
->false
sequenceequal([1, 2, 3], [1, 2])
->false
share
pipe(range(0, 4), map(i => ({ i })), share(), xs => zip(xs, xs, (x1, x2) => [x1.i, x2.i, x1 === x2]))
seq [[0, 1, false], [2, 3, false]]
single
single([1])
->1
single([])
->undefined
single([1, 2, 3], x => x > 2)
->3
single([1, 2, 3], x => x > 10)
->undefined
single([1, 2, 3], x => x > 10, -1)
->-1
skip
skip([1, 2, 3, 4, 5], 2)
->seq [3, 4, 5]
skiplast
skiplast([1, 2, 3, 4], 2)
->seq [1, 2]
skiplast([1, 2, 3, 4], 0)
->seq [1, 2, 3, 4]
skiplast([1, 2, 3, 4], 5)
->seq []
skipwhile
skipwhile([1, 2, 2, 3, 3, 4, 5], x => x < 3)
->seq [3, 3, 4, 5]
some
some([1])
->true
some([])
->false
some([1, 2, 3], x => x > 2)
->true
some([1, 2, 3], x => x > 3)
->false
sum
sum([1, 2, 3])
->6
sum(['a', 'asd', 'yy'], x => x.length)
->6
sum(['a', 'asd', 'yy'], (x, index) => x.length + index)
->9
take
take([1, 2, 3, 4, 5], 2)
->seq [1, 2]
takelast
takelast([1, 2, 3], 2)
->seq [2, 3]
takelast([1, 2, 3], 0)
->seq []
takelast([1, 2, 3], 5)
->seq [1, 2, 3]
takewhile
takewhile([1, 2, 2, 3, 3, 4, 5], x => x < 3)
->seq [1, 2, 2]
thenby
thenby(orderby(['xa', 'a', 'fg', 'ert', 'b'], x => x.length), x => x)
->seq ['a', 'b', 'fg', 'xa', 'ert']
thenbydescending
thenbydescending(orderby(['xa', 'a', 'fg', 'ert', 'b'], x => x.length), x => x)
seq ['b', 'a', 'xa', 'fg', 'ert']
toarray
toarray([1, 2, 2])
->[1, 2, 2]
tomap
tomap(['a', 'bb', 'ccc'], x => x.length)
->Map {1 => 'a', 2 => 'bb', 3 => 'ccc'}
tomap(['a', 'bb', 'ccc'], x => x.length, x => x.toUpperCase())
->Map {1 => 'A', 2 => 'BB', 3 => 'CCC'}
toobject
toobject(['a', 'bb', 'ccc'], x => x.length)
->{ 1:'a', 2:'bb', 3:'ccc' }
toobject(['a', 'bb', 'ccc'], x => x.length, x => x.toUpperCase())
->{ 1:'A', 2:'BB', 3:'CCC' }
toobject(['a', 'bb', 'ccc'], x => x.length, (x, k) => k)
->{ 1:1, 2:2, 3:3 }
toobject(new Map([[1, 'one'], [2, 'two']]))
->{ 1:'one', 2:'two' }
union
union([1, 2, 2], [2, 3, 3, 4])
->seq [1, 2, 3, 4]
unionby
unionby(['a', 'c', 'ddd'], ['r', 'ww', 'ttt', 'oooo'], x => x.length)
->seq ['a', 'ddd', 'ww', 'oooo']
zip
zip(['a', 'b', 'c'], [1, 2], (s, n) => s + n)
->seq ['a1', 'b2']
zip(['a', 'b', 'c'], [1, 2], [false], (s, n, b) => s + n + b)
->seq ['a1false']
mapping
- average - Average (linq), mean, meanBy (lodash), average, averageBy (fsharp), average (kotlin), C.averaging*, C.summarizing* (java)
- buffer - Chunk (linq), bufferCount, pairwise (rxjs), chunk (lodash), chunkBySize, windowed, pairwise (fsharp), partition-all, partition~ (clojure), chunked, windowed (kotlin)
- cast - Cast (linq), cast (fsharp)
- combinations -
- concat - Concat (linq), concat (rxjs), concat (jsarray), concat (lodash), append (fsharp), concat (clojure), plus, plusElement (kotlin), concat (java)
- count - Count (linq), count (rxjs), size (lodash), length (fsharp), count (clojure), count (kotlin), count, C.counting, C.summarizing* (java)
- countby - countBy (fsharp)
- defaultifempty - DefaultIfEmpty (linq), defaultIfEmpty (rxjs), ifEmpty (kotlin)
- defer - defer (rxjs), delay (fsharp)
- distinct - Distinct (linq), distinct (rxjs), uniq, uniqWith (lodash), distinct (fsharp), distinct (clojure), distinct (kotlin), distinct (java)
- distinctby - DistinctBy (linq), uniqBy (lodash), distinctBy (fsharp), distinctBy (kotlin)
- distinctuntilchanged - distinctUntilChanged, distinctUntilKeyChanged (rxjs), dedupe (clojure)
- doo - do (rxjs), onEach (kotlin), peek (java)
- elementat - ElementAt, ElementAtOrDefault (linq), elementAt (rxjs), nth (lodash), nth (fsharp), nth, get~ (clojure), elementAt, elementAtOrElse, elementAtOrNull (kotlin)
- empty - empty (rxjs), empty (fsharp), emptySequence (kotlin), empty (java)
- entries - pairs (rxjs), entries (jsarray)
- every - All (linq), every (rxjs), every (jsarray), every (lodash), forall (fsharp), every? (clojure), all (kotlin), allMatch (java)
- except - Except (linq), difference, without (lodash), difference~ (clojure), minus~ (kotlin)
- exceptby - ExceptBy (linq), differenceBy, differenceWith (lodash)
- expand - expand (rxjs), unfold (fsharp)
- filter - Where (linq), filter (rxjs), filter (jsarray), filter (lodash), filter, where (fsharp), filter (clojure), filter, filterIndexed (kotlin), filter (java)
- filtermap - choose (fsharp), keep (clojure), mapNotNull, mapIndexedNotNull (kotlin)
- find - First, FirstOrDefault (linq), find, first (rxjs), find (jsarray), first, head, find (lodash), find~, tryFind, head (fsharp), first~ (clojure), find, first~ (kotlin), findFirst~ (java)
- findindex - findIndex (rxjs), findIndex (jsarray), findIndex (lodash), findIndex~, tryFindIndex (fsharp), indexOfFirst, indexOf~ (kotlin)
- flat - flat~ (jsarray), flatten (lodash), flatten~ (clojure), flatten (kotlin)
- flatmap - SelectMany (linq), flatMap (jsarray), flatMap (lodash), collect (fsharp), mapcat (clojure), flatMap (kotlin), flatMap, mapMulti (java)
- foreach - forEach (jsarray), each, forEach (lodash), iter, iteri (fsharp), forEach, forEachIndexed (kotlin), forEach (java)
- generate - init, initInfinite (fsharp), iterate, repeatedly (clojure), generate (kotlin), iterate (java)
- groupby - GroupBy (linq), groupBy (rxjs), groupBy (lodash), groupBy (fsharp), group-by (clojure), groupBy, groupingBy (kotlin), C.groupingBy (java)
- groupbytoobject -
- groupbytotransformedobject -
- groupjoin - GroupJoin (linq)
- ignoreelements - ignoreElements (rxjs)
- includes - Contains (linq), includes (jsarray), includes (lodash), contains (fsharp), contains? (clojure), contains (kotlin)
- interleave - interleave (clojure)
- interpose - interpose (clojure)
- intersect - Intersect (linq), intersection (lodash), intersection~ (clojure), intersect~ (kotlin)
- intersectby - IntersectBy (linq), intersectionBy, intersectionWith (lodash)
- isempty - isEmpty (rxjs), isEmpty (fsharp), empty? (clojure), none (kotlin)
- join - Join (linq)
- last - Last, LastOrDefault (linq), last (rxjs), findLast (lodash), last (fsharp), findLast, last~ (kotlin)
- map - Select (linq), map (rxjs), map (jsarray), map (lodash), map, mapi (fsharp), map (clojure), map, mapIndexed (kotlin), map (java)
- max - Max (linq), max (rxjs), max (lodash), max (fsharp), maxOf (kotlin), max (java)
- maxby - MaxBy (linq), maxBy (lodash), maxBy (fsharp), max-key (clojure), maxBy (kotlin), C.maxBy, C.summarizing* (java)
- memoize - cache (fsharp)
- min - Min (linq), min (rxjs), min (lodash), min (fsharp), minOf (kotlin), min (java)
- minby - MinBy (linq), minBy (lodash), minBy (fsharp), min-key (clojure), minBy (kotlin), C.minBy, C.summarizing* (java)
- oftype - OfType (linq)
- orderby - OrderBy (linq), sort (jsarray), orderBy, sortBy (lodash), sort, sortBy (fsharp), sort, sort-by (clojure), sorted, sortedBy (kotlin), sorted (java)
- orderbydescending - OrderByDescending (linq), sort (jsarray), orderBy, sortBy (lodash), sort, sortBy (fsharp), sortedDescending, sortedByDescending (kotlin)
- pairwise - pairwise (rxjs), pairwise (fsharp)
- partitionby - partition-by (clojure)
- range - Range (linq), range (rxjs), range (lodash), range (clojure)
- reduce - Aggregate (linq), reduce (rxjs), reduce (jsarray), reduce (lodash), fold, reduce (fsharp), reduce (clojure), fold, reduce, reduceOrNull (kotlin), reduce (java)
- repeat - repeat (rxjs), cycle (clojure)
- repeatvalue - repeat (clojure)
- reverse - Reverse (linq), reverse (jsarray), reverse (lodash), reverse (clojure)
- scan - scan (rxjs), scan (fsharp), reductions (clojure), scan, runningFold, runningReduce (kotlin)
- sequenceequal - SequenceEqual (linq), sequenceEqual (rxjs)
- share - share (rxjs)
- single - Single, SingleOrDefault (linq), single (rxjs), exactlyOne (fsharp), single, singleOrNull (kotlin)
- skip - Skip (linq), skip (rxjs), drop, tail (lodash), skip~ (fsharp), drop (clojure), drop (kotlin), skip (java)
- skiplast - dropRight, initial (lodash), drop-last (clojure)
- skipwhile - SkipWhile (linq), skipWhile (rxjs), dropWhile (lodash), skipWhile (fsharp), drop-while (clojure), dropWhile (kotlin), dropwhile (java)
- some - Any (linq), some (jsarray), some (lodash), exists (fsharp), some (clojure), any (kotlin), anyMatch (java)
- sum - Sum (linq), sum, sumBy (lodash), sum, sumBy (fsharp), sum, sumOf (kotlin), C.summing*, C.summarizing* (java)
- take - Take (linq), take (rxjs), take (lodash), truncate, ~take (fsharp), take (clojure), take (kotlin), limit (java)
- takelast - takeLast (rxjs), last, takeRight (lodash), take-last (clojure)
- takewhile - TakeWhile (linq), takeWhile (rxjs), takeWhile (lodash), takeWhile (fsharp), take-while (clojure), takeWhile (kotlin), takeWhile (java)
- thenby - ThenBy (linq), sort (jsarray), orderBy, sortBy (lodash), sort, sortBy (fsharp)
- thenbydescending - ThenByDescending (linq), sort (jsarray), orderBy, sortBy (lodash), sort, sortBy (fsharp)
- throww - throw (rxjs)
- toarray - ToArray (linq), toArray (fsharp), toList (kotlin), toArray, toList, C.toList (java)
- tomap - ToDictionary (linq), toMap (kotlin), C.toMap (java)
- toobject - fromPairs, keyBy (lodash), associate, associateBy, associateWith (kotlin), C.toMap (java)
- union - Union (linq), union (lodash), union~ (clojure), union~ (kotlin)
- unionby - UnionBy (linq), unionBy, unionWith (lodash)
- zip - Zip (linq), zip (rxjs), zip, zipWith (lodash), zip, zip3 (fsharp), map (clojure), zip (kotlin)