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Lists is a library of JavaScript higher-order functions for working with arrays and strings. The library was inspired by Haskell's Data.List module by the powerful people over at The University of Glasgow. You can view the original source here. You could then scroll through each function closely and see a purposefully similar correlation between the Haskell implementation and this implementation.
Pass functions to functions to functions to solve complex problems. Most of the functions featured in Lists produce new arrays, to reinforce the paradigm of stateless programming.
Disclaimer: Almost all of these functions are naive recursive definitions. The idea behind this library is to maximize problem-solving expressivity. This library provides an alternative toolbox by which to solve problems. This library should be sufficient for most projects but remember to monitor your heap memory space in the case of excessive function calls.
A{ 1. } Function number
B{ tail } Function name
C{ arr|str -> [x] } Pseudo type signature
tail : arr|str -> [x]
map : [x] -> f -> [x]
Basic Functions
append : [x]|str -> [x]|str|num -> [x]|strhead : [x]|str -> xlast : [x]|str -> xinit : [x]|str -> [x]tail : [x]|str -> [x]nil : [x]|str -> booleanList Transformations
map : [x] -> f -> [x]rev : [x] -> [x]intersperse : x -> [x] -> [x]|strintercalate : [x] -> [[x]] -> [x]transpose : [[x]] -> [[x]]subsequences : [x] -> [[x]]permutations : [x]|str -> [[x]]|[str]Reducing Lists (folds)
foldl : x -> [x]|str -> f -> xfoldl1 : [x]|str -> f -> xfoldr : x -> [x]|str -> f -> xfoldr1 : [x]|str -> f -> xflatten || concat : [[x]]|[str] -> [x]|strconcatMap : [x]|str -> f -> [x]|strand : [boolean] -> booleanor : [boolean] -> booleanany : [x]|str -> f -> booleanall : [x]|str -> f -> booleansum : [num] -> numproduct : [num] -> nummaximum : [num] -> numminimum : [num] -> nummaxList : [[x]] -> [x]minList : [[x]] -> [x]Building Lists
scanl : x -> [x]|str -> f -> [x]scanr : x -> [x]|str -> f -> [x]mapAccumL : x -> [x]|str -> f -> [x, [x]]mapAccumR : x -> [x]|str -> f -> [x, [x]]iterate : x -> num -> f -> [x]replicate : x -> num -> [x]cycle : [x]|str -> num -> [x]|strunfold : f -> f -> f -> x -> [x]|strSublists
take : num -> [x]|str -> [x]drop : num -> [x]|str -> [x]splitAt : num -> [x]|str -> [[x],[x]]takeWhile : f -> [x]|str -> [x]dropWhile : f -> [x]|str -> [x]span : arr|str -> f -> [[x], [x]|str]break : arr|str -> f -> [[x], [x]|str]stripPrefix : [num]|str -> [num]|str -> [num]|[str]group : [num]|str -> [[num]]|[[str]]inits : [x] -> [[x]]tails : [x] -> [[x]]Predicates
isPrefixOf : [num]|str -> [num]|str -> booleanisSuffixOf : [num]|str -> [num]|str -> booleanisInfixOf : [num]|str -> [num]|str -> booleanisSubsequenceOf : [num]|str -> [num]|str -> booleanSearching Lists
elem : num|str -> [num]|str -> booleannotElem : num|str -> [num]|str -> booleanlookup : num|str -> [[num|str,x]] -> booleanfind : [x] -> f -> xfilter : [x] -> f -> [x]partition : [x] -> f -> [[x],[x]]Indexing Lists
bang : num -> [x] -> xZipping and Unzipping Lists
Special Lists
Generalized Functions
Extra Functional Utilities
Signature Definition: Give arg 1 an Array of Variables or a String. Give arg 2 an Array of Variables or a String or a Number. Get an Array of Variables or a String.
Example Usage:
lists.append([1],[2]); /* [1,2] */
lists.append([1],2); /* [1,2] */
lists.append('a','b'); /* 'ab' */
Signature Definition: Give arg 1 an Array of Variables or a String. Get a Variable.
Example Usage:
lists.head([1,2]); /* 1 */
lists.head([[1,2],[3,4]]); /* [1,2] */
lists.head('ab'); /* 'a' */
Signature Definition: Give arg 1 an Array of Variables or a String. Get a Variable.
Example Usage:
lists.last([1,2]); /* 2 */
lists.last([[1,2],[3,4]]); /* [3,4] */
lists.last('ab'); /* 'b' */
Signature Definition: Give arg 1 an Array of Variables or a String. Get an Array of Variables.
Example Usage:
lists.init([1,2,3]); /* [1,2] */
lists.init([[1,2],[3,4],[5,6]]); /* [[1,2],[3,4]] */
lists.init('abc'); /* ['a','b'] */
Signature Definition: Give arg 1 an Array of Variables or a String. Get an Array of Variables.
Example Usage:
lists.tail([1,2,3]); /* [2,3] */
lists.tail([[1,2],[3,4],[5,6]]); /* [[3,4],[5,6]] */
lists.tail('abc'); /* ['b','c'] */
Signature Definition: Give arg 1 an Array of Variables or a String; Get a boolean.
Example Usage:
lists.nil(null); /* true */
lists.nil([]); /* true */
lists.nil(''); /* true */
lists.nil('a'); /* false */
lists.nil([1]); /* false */
Signature Definition: Give arg 1 an Array of Variables or a String. Give arg 2 a Function. Get an Array of Variables.
Example Usage:
lists.map([1,2,3], function(x) { return x*2 }); /* [2,4,6] */
lists.map('abc', function(str) { return str.toUpperCase() }); /* ["A","B","C"] */
lists.map([{'S': 1}, {'u': 2}, {'p': 3}], function(obj) {
return lists.flatten(lists.keys(obj))
}); /* ["S", "u", "p"] */
Signature Definition: Give arg 1 an Array of Variables or a String. Get an Array of Variables.
Example Usage:
lists.rev([1,2,3]); /* [3,2,1] */
lists.rev('abc'); /* ['c','b','a'] */
lists.rev([[2],[3]]); /* [[3],[2]] */
Signature Definition: Give arg 1 a Variable. Give arg 2 an Array of Variables. Get an Array of Variables or a String.
Example Usage:
lists.intersperse(1,[5,5,5]); /* [5,1,5,1,5] */
lists.intersperse([1,2],[[6],[6]]); /* [[6],[1,2],[6]] */
lists.intersperse('b','ac'); /* 'abc' */
lists.intersperse({b:2},[{a:1},{b:3}]); /* [{a:1},{b:2},{c:3}] */
Signature Definition: Give arg 1 an Array of Variables. Give arg 2 an Array of an Array of Variables. Get an Array of Variables.
Example Usage:
lists.intercalate([1],[[5],[5],[5]]); /* = lists.flatten(lists.intersperse([1],[[5],[5],[5]])) // [5,1,5,1,5] */
lists.intercalate(["abc"],[["efg"],["qrs"]]); /* ["efg", "abc", "qrs"] */
lists.intercalate([{a:1}],[[{b:1}],[{c:2}]]); /* [{b:1},{a:1},{c:2}] */
Signature Definition: Give arg 1 an Array of an Array of Variables. Get an Array of an Array of Variables.
Example Usage:
lists.transpose([[1,2,4],[3,4,4]]); /* [[1,3],[2,4],[4,4]] */
lists.transpose([["a","b","c"],["a","b","c"]]); /* [["a","a"],["b","b"],["c","c"]] */
Signature Definition: Give arg 1 an Array of Variables. Get an Array of an Array of Variables.
Example Usage:
lists.subsequences('ab'); /* [[],['a'],['b'],['ab']] */
lists.subsequences([1,2,3]); /* [[],[1],[2],[1,2],[3],[1,3],[2,3],[1,2,3]] */
Signature Definition: Give arg 1 an Array of Variables or a String. Get an Array of an Array of Variables or an Array of Strings respectively.
Example Usage:
lists.permutations('abc'); /* ["abc","acb","bac","bca","cab","cba"] */
lists.permutations([1,2,3]); /* [[1,2,3],[1,3,2],[2,1,3],[2,3,1],[3,1,2],[3,2,1]] */
Signature Definition: Give arg 1 a starting Variable (usually a left identity of the binary operator). Give arg 2 an Array of Variables or a String. Give arg 3 a Function (binary operator). Get a Variable.
Example Usage:
reverse = lists.foldl('','abc',function(x,y){ return y.concat(x); }); /* "cba" */
sum = lists.foldl(0,[1,2,3],function(x,y){ return x+y; }); /* 6 */
lists.foldl([], [[1,2],[3,4]], function(x,y) {return x.concat(y) }); /* [1,2,3,4] */
Signature Definition: Give arg 1 an Array of Variables or a String. Give arg 2 a Function (binary operator). Get a Variable.
Example Usage:
lists.foldl1('abc',function(x,y){ return x.concat(y).toUpperCase() }); /* "ABC" */
lists.foldl1([1,2,3],function(x,y){ return x+y }); /* 6 */
Signature Definition: Give arg 1 a starting Variable (usually a right identity of the binary operator). Give arg 2 an Array of Variables or a String. Give arg 3 a Function (binary operator). Get a Variable.
Example Usage:
lists.foldr(0,[1,2,3,4],function(x,y){ return x-y; }); /* -2 */
lists.foldr([],[[1,2],[3,4],[5,6]],function(x,y){
return lists.rev(x).concat(y);
}); /* [4,3,1,2,5,6] */
Signature Definition: Give arg 1 an Array of Variables or a String. Give arg 2 a Function (binary operator). Get a Variable.
Example Usage:
lists.foldr1([1,2,3],function(x,y){ return x - y }); /* 3 */
lists.foldr1('aabbcc',function(x,y){ return x=='a'? x=y : x.concat(y)}); /* "bbcc" */
Signature Definition: Give arg 1 an Array of an Array of Variables or an Array of Strings. Get an Array of Variables or a String.
Example Usage:
lists.flatten(['abc']); /* 'abc' */
lists.flatten([[1,2],[3,4]]); /* [1,2,3,4] */
Signature Definition: Give arg 1 an Array of Variables or a String. Give arg 2 a Function that produces an Array of Variables or String. Get an Array of Variables or a String.
Example Usage:
lists.concatMap(['bang','bang'], function(x){ return x+'!'}); /* "bang!bang!" */
lists.concatMap([1,2,3],function(x){ return [[x*2,x/2]] }); /* [[2,0.5],[4,1],[6,1.5]] */
lists.concatMap([{a:1},{b:2}], function(x){
x.prop = 'hi';
return [x]
}); /* [{a:1,prop:"hi"},{b:2,prop:"hi"}]*/
Signature Definition: Give arg 1 an Array of booleans. Get a boolean.
Example Usage:
lists.and([5>1,5>2,5>3]); /* true */
lists.and([5>1,false,5>3]); /* false */
Signature Definition: Give arg 1 an Array of booleans. Get a boolean.
Example Usage:
lists.or([5<1,5<2,5>3]); /* true */
lists.or([5<1,5<2,5<3]); /* false */
Signature Definition: Give arg 1 an Array of Variables or a String. Give arg 2 a predicate Function to be applied to each element of arg 1. Get a boolean.
Example Usage:
lists.any([1,2,3],function(x) { return x < .5}); /* false */
lists.any('abc',function(x) { return x == 'b'}); /* true */
Signature Definition: Give arg 1 an Array of Variables or a String. Give arg 2 a predicate Function to be applied to each element of arg 1. Get a boolean.
Example Usage:
lists.all('abc', function(x){ return x==x.toUpperCase() }); /* false */
lists.all([2,4], function(x) { return x > 3 }); /* false */
lists.all([2,4], function(x) { return x%2==0 }); /* true */
Signature Definition: Give arg 1 an Array of Numbers. Get a Number.
Example Usage:
lists.sum([2,4,6]); /* 12 */
lists.sum([.2,.4,.6]); /* 1.2000000000000002 */
Signature Definition: Give arg 1 an Array of Numbers. Get a Number.
Example Usage:
lists.product([2,4,6]); /* 48 */
lists.product([.2,.4,.6]); /* 0.04800000000000001 */
Signature Definition: Give arg 1 an Array of Numbers. Get a Number.
Example Usage:
lists.maximum([2,4,6]); /* 6 */
lists.maximum([.2,.4,.6]); /* .6 */
Signature Definition: Give arg 1 an Array of Numbers. Get a Number.
Example Usage:
lists.minimum([2,4,6]); /* 2 */
lists.minimum([.2,.4,.6]); /* .2 */
Signature Definition: Give arg 1 an Array of an Array of Variables. Get an Array of Variables.
Example Usage:
lists.maxList([[1],[2,3]]); /* [2,3] */
lists.maxList([[1,2],[3]]); /* [1,2] */
Signature Definition: Give arg 1 an Array of an Array of Variables. Get an Array of Variables.
Example Usage:
lists.minList([[],[1]]); /* [] */
lists.minList([[1,2],[3]]); /* [3] */
Signature Definition: Give arg 1 a starting Variable. Give arg 2 an Array of Variables or a String. Give arg 3 a Function (binary operator). Get an Array of Variables.
Example Usage:
lists.scanl('.','abc',function(x,y){return x + y}); /* [".",".a",".ab",".abc"] */
lists.scanl(0,[1,2,3],function(x,y){return x + y}); /* [0,1,3,6] */
Signature Definition: Give arg 1 a starting Variable. Give arg 2 an Array of Variables or a String. Give arg 3 a Function (binary operator). Get an Array of Variables.
Example Usage:
lists.scanr('.','abc',function(x,y){return x + y}); /* ["abc.","bc.","c.","."] */
lists.scanr(0,[1,2,3],function(x,y){return x + y}); /* [6,5,3,0] */
Signature Definition: Give arg 1 a starting Variable (accumulator). Give arg 2 an Array of Variables or a String. Give arg 3 a Function. Get an Array of Variable followed by Array of Variables.
Example Usage:
lists.mapAccumL(5, [2,4,8], function(x,y){ return [x+y,x*y]}); /* [19, [10,28,88]]*/
lists.mapAccumL(5, [2,4,8], function(x,y){ return [y,y]}); /* [8, [2,4,8]] */
lists.mapAccumL(5, [5,5,5], function(x,y){ return [x,x]}); /* [5, [5,5,5]] */
Signature Definition: Give arg 1 a starting Variable (accumulator). Give arg 2 an Array of Variables or a String. Give arg 3 a Function. Get an Array of Variable followed by Array of Variables.
Example Usage:
lists.mapAccumR(5, [2,4,8], function(x,y){ return [x+y,x*y]}); /* [19, [34,52,40]]*/
lists.mapAccumR(5, [2,4,8], function(x,y){ return [y,y]}); /* [2, [2,4,8]] */
lists.mapAccumR(5, [5,5,5], function(x,y){ return [x,x]}); /* [5, [5,5,5]] */
Signature Definition: Give arg 1 a Variable. Give arg 2 a Number. Give arg 3 a Function. Get an Array of Variables.
Example Usage:
lists.iterate('a',3,function(ch){return ch+'b'}); /* ["a","ab","abb"] */
lists.iterate([1,2],3,function(xs){return lists.intersperse(6,xs)}); /* [[1,2],[1,6,2],[1,6,6,6,2]] */
lists.iterate(2,4,function(x){ return x*x }); /* [2,4,16,256] */
Signature Definition: Give arg 1 a Variable. Give arg 2 a Number. Get an Array of Variables.
Example Usage:
lists.replicate(5,5); /* [5,5,5,5,5] */
lists.replicate([1,2],2); /* [[1,2],[1,2]] */
lists.replicate({a:1},2); /* [{a:1},{a:2}] */
Signature Definition: Give arg 1 an Array of Variables. Give arg 2 a Number. Get an Array of Variables.
Example Usage:
lists.cycle('abc',3); /* "abcabcabc" */
lists.cycle([1,2],2); /* [1,2,1,2] */
Signature Definition: Give arg 1 an Function (predicate). Give arg 2 a Function. Give arg 3 a Function. Give arg 4 a Variable (seed).
Example Usage:
function chop8(xs){
return l.unfold(l.nil,l.part(l.take,8,_),l.part(l.drop,8,_),xs)
}
chop8([1,2,3,4,5,6,7,8,9]); /* [[1,2,3,4,5,6,7,8],[9]] */
function unfoldMap(xs,f) {
return lists.unfold(
lists.nil,
lists.part(lists.pipe(f,lists.head),_),
lists.part(lists.tail,_),
xs)
}
unfoldMap([1,2],function(x){ return x * 2 }); /* [2,4] */
Signature Definition: Give arg 1 a Number. Give arg 2 an Array of Variables or a String. Get an Array of Variables.
Example Usage:
lists.take(2,[1,2,3]); /* [1,2] */
lists.take(2,'abc'); /* ["a","b"] */
Signature Definition: Give arg 1 a Number. Give arg 2 an Array of Variables or a String. Get an Array of Variables.
Example Usage:
lists.drop(2,[1,2,3]); /* [3] */
lists.drop(2,'abc'); /* ["c"] */
Signature Definition: Give arg 1 a Number. Give arg 2 an Array of Variables or a String. Get an Array of two Arrays of Variables.
Example Usage:
lists.splitAt(2,'abc') /* [['a','b'],['c']] */
lists.splitAt(2,[1,2,3]) /* [[1,2],[3]] */
Signature Definition: Give arg 1 a Function. Give arg 2 an Array of Variables or a String. Get an Array of Variables.
Example Usage:
lists.takeWhile([1,2,3,1], function(x){ return x < 3 }); /* [1,2] */
lists.takeWhile([1], function(x){ return x < 2 }); /* [1] */
lists.takeWhile('aabc', function(x){ return x =='a' }); /* ["a","a"] */
Signature Definition: Give arg 1 a Function. Give arg 2 an Array of Variables or a String. Get an Array of Variables.
Example Usage:
lists.dropWhile([1,2,3,4], function(x){ return x < 3 }); /* [3,4] */
lists.dropWhile([1], function(x){ return x < 2 }); /* [2] */
lists.dropWhile('aabc', function(x){ return x =='a' }); /* ["b","c"] */
Signature Definition: Give arg 1 an Array of Variables or String. Give arg 2 a Function. Get an Array of an Array of Variables and Array of Variables or a String (psuedo-tuple).
Example Usage:
lists.span([1,2,3,4], function(x){return x < 3}); /* [[1,2],[3,4]] */
lists.span("abcde", function(x){return x == "a"}); /* [["a"],["b","c","d","e"]] */
lists.span([{a:2},{a:2},{b:2}], function(x){return x.a==2}); /* [[{a:2},{a:2}],[{b:2}]] */
Signature Definition: Give arg 1 an Array of Variables or a String. Give arg 2 a Function. Get an Array of an Array of Variables and Array of Variables or a String (psuedo-tuple).
Example Usage:
lists.break([1,2,3,4], function(x){return x < 3}); /* [[],[1,2,3,4]] */
lists.break("abcde", function(x){return x == "a"}); /* [[],"abcde"] */
lists.break([{a:2},{a:2},{b:2}], function(x){return x.a==2}); /* [[],[{a:2},{a:2},{b:2}]] */
Signature Definition: Give arg 1 an Array of Numbers or String. Give arg 2 an Array of Numbers or String. Get an Array of Numbers or an Array of Strings.
Example Usage:
lists.stripPrefix("abc","abcabce"); /* ["a","b","c","e"] */
lists.stripPrefix([1,2],[1,2,3,4]); /* [3,4] */
Signature Definition: Give arg 1 an Array of Numbers or a String. Get an Array of an Array of Numbers or Strings.
Example Usage:
lists.group([1,1,2,3,3]); /* [[1,1],[2],[3,3]] */
lists.group("mississippi"); /* [["m"],["i"],["s","s"],["i"],["s","s"],["i"],["p","p"],["i"]] */
Signature Definition: Give arg 1 an Array of Variables. Get an Array of an Array of Variables.
Example Usage:
lists.inits([1,2,3]); /* [[],[1],[1,2],[1,2,3]] */
lists.inits("abc"); /* [[],["a"],["a","b"],["a","b","c"]] */
lists.inits([{a:2},{b:3}]); /* [[],[{a:2}],[{a:2},{b:3}]] */
Signature Definition: Give arg 1 an Array of Variables. Get an Array of an Array of Variables.
Example Usage:
lists.tails([1,2,3]); /* [[1,2,3],[1,2],[1],[]] */
lists.tails("abc"); /* [["a","b","c"],["a","b"],["a"],[]] */
lists.tails([{a:2},{b:3}]); /* [[{a:2},{b:3}],[{a:2}],[]] */
Signature Definition: Give arg 1 an Array of Numbers or String. Give arg 2 an Array of Numbers or a String. Get a boolean.
Example Usage:
lists.isPrefixOf([1,2],[1,2,3]); /* true */
lists.isPrefixOf("abc","acd"); /* false */
lists.isPrefixOf("ab","abcd"); /* true */
Signature Definition: Give arg 1 an Array of Numbers or String. Give arg 2 an Array of Numbers or a String. Get a boolean.
Example Usage:
lists.isSuffixOf([1,2],[1,2,3]); /* false */
lists.isSuffixOf("cd","acd"); /* true */
lists.isSuffixOf("d","abcd"); /* true */
Signature Definition: Give arg 1 an Array of Numbers or a String. Give arg 2 an Array of Numbers or a String. Get a boolean.
Example Usage:
lists.isInfixOf([1,2],[1,3,2]); /* false */
lists.isInfixOf("cd","acde"); /* true */
lists.isInfixOf("a","abcd"); /* true */
Signature Definition: Give arg 1 an Array of Numbers or String. Give arg 2 an Array of Numbers or a String. Get a boolean.
Example Usage:
lists.isSubsequenceOf([1,2],[1,3,2]); /* true */
lists.isSubsequenceOf("abc","123 abc"); /* true */
lists.isSubsequenceOf("Lol","Laugh out loud"); /* true */
Signature Definition: Give arg 1 a Number or String. Give arg 2 an Array of Numbers or a String. Get a boolean.
Example Usage:
lists.elem(2,[1,3,2]); /* true */
lists.elem("2","123 abc"); /* true */
Signature Definition: Give arg 1 a Number or String. Give arg 2 an Array of Numbers or a String. Get a boolean.
Example Usage:
lists.notElem(0,[1,3,2]); /* true */
lists.notElem("a","abc"); /* false */
Signature Definition: Give arg 1 a Number or String. Give arg 2 an Array of an Array containing a Number or String as the key and a Variable as the value. Get a Variable (value).
Example Usage:
lists.lookup("a",[["a",2],["b",3]]); /* 2 */
lists.lookup("ab",[["ab",2],["b",3]]); /* 2 */
lists.lookup(1,[[1,{a:2}],["b",3]]); /* {a:2} */
Signature Definition: Give arg 1 an Array of Variables. Give arg 2 a Function. Get a Variable.
Example Usage:
lists.find([{a:2}], function(x) { return x.a == 2 }); /* {a:2} */
lists.find([[1,2]], function(x) { return x[0] == 1}); /* [1,2] */
lists.find([1,2,3], function(x) { return x == 0 }); /* "Nothing" */
Signature Definition: Give arg 1 an Array of Variables. Give arg 2 a Function. Get an Array of Variables.
Example Usage:
lists.filter([{a:1},{b:2}], function(obj) { return Object.keys(obj).length > 0 }); /* [{a:1},{b:2}] */
lists.filter("abc", function(char) { return char == "a" }); /* ["a"] */
lists.filter([[1],[1,2]], function(arr) { return arr.length > 1 }); /* [[1,2]] */
Signature Definition: Give arg 1 an Array of Variables. Give arg 2 a Function. Get an Array of two Arrays of Variables.
Example Usage:
lists.partition("Abc", function(char) { return char.startsWith("b") }); /* [["b"],["A","c"]] */
lists.partition([1,2,3,4], function(num) { return num % 2 == 0 }); /* [[2,4],[1,3]] */
lists.partition([{a:1},{b:2,a:2}], function(obj) { return obj.a == 2 }); /* [[{b:2,a:2}],[{a:1}]] */
Signature Definition: Give arg 1 a Number. Give arg 2 an Array of Variables. Get a Variable.
Example Usage:
lists.bang(1,[0,{a:2},1]); /* {a:2} */
lists.bang(0,[[1,2],4]); /* [1,2] */
lists.bang(3,[1,2]) /* -1 */
FAQs
A library of higher-order functions modeled after Haskell's Data.List module
The npm package lists receives a total of 11 weekly downloads. As such, lists popularity was classified as not popular.
We found that lists demonstrated a not healthy version release cadence and project activity because the last version was released a year ago. It has 1 open source maintainer collaborating on the project.
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