javascript flatten array of arrays

Solutions on MaxInterview for javascript flatten array of arrays by the best coders in the world

showing results for - "javascript flatten array of arrays"
Gilda
06 Jan 2018
1// flat(depth), 
2// depth is optional: how deep a nested array structure 
3//		should be flattened.
4//		default value of depth is 1 
5
6const arr1 = [1, 2, [3, 4]];
7arr1.flat(); 
8// [1, 2, 3, 4]
9
10const arr2 = [1, 2, [3, 4, [5, 6]]];
11arr2.flat();
12// [1, 2, 3, 4, [5, 6]]
13
14const arr3 = [1, 2, [3, 4, [5, 6]]];
15arr3.flat(2);
16// [1, 2, 3, 4, 5, 6]
17
18const arr4 = [1, 2, [3, 4, [5, 6, [7, 8, [9, 10]]]]];
19arr4.flat(Infinity);
20// [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]
Stefano
06 Feb 2019
1const flatten = (ary) => ary.reduce((a, b) => a.concat(Array.isArray(b) ? flatten(b) : b), [])
2
Julia
09 Jan 2020
1var arrays = [
2  ["$6"],
3  ["$12"],
4  ["$25"],
5  ["$25"],
6  ["$18"],
7  ["$22"],
8  ["$10"]
9];
10var merged = [].concat.apply([], arrays);
11
12console.log(merged);
Filippo
05 Jun 2018
1var multiDimensionArray = [["a"],["b","c"],["d"]]; //array of arrays
2var flatArray = Array.prototype.concat.apply([], multiDimensionArray); //flatten array of arrays
3console.log(flatArray); // [ "a","b","c","d"];
Mirko
23 Oct 2020
1// Although this now may be an older version of how to faltten an 
2// array of arrays. I still want to post it so some may have an understanding 
3// of how it works
4
5function falltenArray(arr) {
6  
7  let result = [...arr];
8  let flattened = false;
9  let counter = 0;
10  
11  while (flattened === false){
12	// checks to see if the element at the counter index is an array
13      if (Array.isArray(result[counter])){
14        // unpacks the current array element back into the array
15        result.splice(counter, 1, ...result[counter]);
16        // if so the counter should start at the beginning of the array
17        counter = 0;
18        
19      } else {
20        counter += 1;
21      }
22
23      if (counter === result.length){
24        flattened = true;
25      }
26  }
27  
28  return result;
29}
Isabelle
17 Jan 2020
1function flatten(arr) {
2  const result = []
3
4  arr.forEach((i) => {
5    if (Array.isArray(i)) {
6      result.push(...flatten(i))
7    } else {
8      result.push(i)
9    }
10  })
11  
12  return result
13}
14
15// Usage
16const nested = [1, 2, 3, [4, 5, [6, 7], 8, 9]]
17
18flatten(nested) // [1, 2, 3, 4, 5, 6, 7, 8, 9]
queries leading to this page
js flatten object in arrayhotw to flat array of arrayarray flat mapflatten arrajavascript join all nested arrayarray of arrays to single array javascriptjavascript flatten nested arrayjs flatten subarrayflat array angulararray of array to single arrayflatten an array javascript without flatflatten two arraysjs array fla all sub elementsflatten a lsit of lists javascriptjavascript flat related functionjavascript flatten array one leveljavascript flatten array 27open nested array one list javascriptarray flattenjavascriptjs spread array into array instead of nesting arraysjs flatten functioin flat 28 29javascriptarray flat jsjsflattenflattening array of arrays javascriptfalttening an array programminghow to flatten an array in jsflttern aray of arrays using map javasxeri c3 a5tflatten function javascript flatten example jsflat 28 29 in javascriptes6 nesterarrayflattening array js implementationjavascript flat array methodflatten aaray in javascriptflattening nested arrays javascriptarray flat dev firefoxjavascript array to array of arraysarrays flattenflat function javascriptnode flat arrayflat the n dimenional array javascritjs flat array of array into onehow to flatten an array in javascript without flat 28 29how to flatten multi level arrays javascriptarr flattenarray flat developer firefoxnested array to one array javascriptflatten array of arraysjs array of arrays to single arrayreact flatten arraywhy is array flat not working in nodejavascript combine array of arrayshow can i flatten a array in javascript 3farray in array to one array js2 array prototype flat 28 29js flatten list of listsconcat all nested array to onejs array flat flatten whymake nested array flatten jsjavascript make flat arrayone array from array of arraysflat in jsjavascript convert array of depth 5b1 2c2 2c 5b3 2c4 5d 2c 5b 5b5 2c6 2c7 5d 5d 5d js to flatarr reduce to concat arraysjs flat array of two arraysflatten an array jsarray flatten eliminate nested and empty array return new array ordejavascript combine nested arraysarray of array to array javascripthow to flatten a arraynode array flatnode flat array of arrayshow to flatten an array of arrays in javascriptjs flat array of arraysreduce multiple array with array prototypejavascript flat array function flat javascriptjavascrip flatten arrayflaten arrays javascriptflattendeep javascriptflatten array of arrays jsarray 23flat 28 29flatten arrays in arraysjavascript array of array flattenjavascript array of arrays to one arrayflattening a array of arrayshow to flatten deep arraybesto option to flatten an arrayes7 flatten arrayjavascript array flat 28 29how to use flatten jsjavascript flatflat infinity in javascriptarray flatten 28 29 jsjavascript arr flattenplain arrays javascript flatarray flatten eliminate nested and empty array return new array orderjava script flatflat array to array of arrayflatten javascriptalternative of flat in javascripthow to make a flat array in javascriptconverting array of array into array jsjavascript concat array of arraysflatten nested arraysflatter javascriprjs flatten filter resultjavascript convert array of arrays to arrayflatten array functiones6 flathow to flatten js arrayarray flat node jsjavascript flat the array until it 27s flatjs invrse array flatjs flat multilevel array falt javascriptjs join nested arrayflatten an arraymake all arrays in an array into a single array javascriptarray flatenhow to convert a nested array to a single array in javascripthow to flaten aarrayflatten an array within an arrayturn array of arrays into one arrayflatten 2d array javascriptflatten a array javascripthow to flaten a 2d array javascripthow to retrun a flattend array operator js array flatarray of object to flat array js es6array of arrays flattenjs flatten array of objects and arraysjavascript flatten array es6how to flatten array of arrays javascriptarray flat mdnhow to write flatten function from scratch javascriptes6 flatten array of arraysun flat array javascriptwhy flatten an arrayflat arrays on javascri c2 b4tflatten tree to array javascriptflatten deep what does flattening an array mean 3fuse of flat in javascriptflat javascript arraynode flatted arrayarray of arrays join jsflatten array in javascript es5 flat arrayflattening an arrayarray flattenhow to flatten an array in javascript wothout flatenmake array from array of arraysflatern js arrayjavascript flatten 28array of objects 29array flat apiarray of array to arrayflat function in javascriptjavascrtip flatten arrayextra flat jsflattening array jsflatten array nodeflattening an array by concat flatten javascript mdnarray fllatjavascript flatten nested arraysjavascript array flattencollect array elements into flat array javascriptflattening nested array javascriptjavascript flattan array of arraysflatten array aof arry in jsflatten array javascriptes6 nested arrayhow to flatening array in javascriptnode js array inside array into single arrayflatten array javascript es6flat out an array in js flat mdnflatten nested array javascriptjs array flat protojavascript concat nested arrayarray of array flatten jsjavascript flatten list of listjavascript flatten arrayflatten array of arrayjavascript flatten array functionflatten everything javscriptjs how to flatten an arrayhow to flat array jshow to flatten the array in javascriptarray faltget all flat array javascriptflatten list javascriptflat array in anfularconvert array of array to array in jslist flat javascriptflat array javascripthow to use reduce to merge array of arraysarray flat jsflatten arayreact flat 28 29node flattennested array to plain array javascriptunwrap array javascriptflattening array of arrays javascript using isarray 28 29js flattebhow to flat array of arrays angularhow to flatten nested arrays javascriptflatten array of arrays jcjs array merge with flattenhow to make a flatten function from scratchjs flatfix the error 3a flattening an arrayflat array in javascriptjs flatten arayflatten the arrays jsjavascript array flatten objectshow to change array of arrays into single arrayflatten array of arrays with javascriptusing spread to flatten array of arrays javascriptarray flatten javascriptflat arrays in js using reducehow to unnest an array with arrays javascriptjavascript flat array of arraysjavascript nested map flattenhow to flatten an array of arrays javascriptnode js flat arrayjavascript array flattenarray of partical array flattenjs flatten array 21garray flat 28 29mdn flatten arrayjavascript join array of arraysjs array flat methodflaten a nestes array of objectsflatten arraysalternative to flat 28 29flatten array within arrayhow to flat an array in javascriptflatten the array of objects in javascriptjavascript how to flatten arrayjs make flatten functionhow to flatten the arrayflattening an array of array in javascriptjs flatt arraywhat 27s flatten in javascriptflatten js arrayconvert deeply nested array to flat array javascriptflat jshow to flatten arrays inside arrays jshow to flatteb list in javascripthow to flatten array javascript without flat 28 29which method do you prefer to flatten an array 26 why 3f one 3a arr flat 28 29 3b two 3a 5b 5d concat 28 arr 29 3b three 3a arr reduce 28 28acc 2c val 29 3d 3e acc concat 28val 29 2c 5b 5d 29 3bjavascritp flatten an arrayunodejs flatten arraymdn array flattenflat array in jsflattenn the arrayflat the array in jsreduce arrays inside array javascriptflatten nodeflat javascriptarray flat vs concat javascriptjs collapse arrayflatten the javascript arrayflatten array concatarray javascript flattenflattening out an arrayjs flatten 28 29javascipt array flattenjs flat arraysflattening an array javascriptnode js array flattenflatten merge arraysjavascript flatern arrayhow to flatten an array in javascriptflattening array in javascriptarray of array to single array javascripthow flat an array jsmap reduce flatten javascriptflattenarray in javascriptjavascript flatten outter array by one leveljavascript how to flatten a clamped arraflatten an array of arraysflatten array from on value in javascriptflattent a arrayjs flat pushjs flat functioncollapse array javascriptjs flaten listjavascript flatten all arraysjavascript array flateflatten array a single level javascriptflat all array of arrayjoin array of arrays es6flatten array es6mdn flatarray flatteningjavascriopt flattenflat array jsflatten an array of array of numbersusing map to concat array of arraysspread all arrays inside an arraycreate a single array from a nested arrayflatten arrayjs flatten array of arraysflatten array of array javascriptnested array to single array javascriptflat js arrayjavascript flatten 28array 29how to flatten array javascriptjs flattern arrayjavascript reduce 2d array to 1d arrayjavascript array flat methodjoin array of arrays into arrayjs flatten arrayjs arrray flatargs flat 28 29 javascriptarray of arrays into one arrayjavascript flatten array of arrays in single arrayflatten a arrayflatten array javascriptes6 flattenjavascript flatten array with one value flat 28 29 in javascripthow to make array in array flat javascriptdocsjavascript flatten arrayjs flat 28 29flat method in jsarray of partical array flatten jsjavascript array flat alternativeflaten array js flatten 28 29 typescriptmulti level array flatten javascriptjavascript array of arrays to single arrayjs collaspse arrayflattening nested arraysarray flat alternative lodashnode flattenarray of arrays flat javascriptjs toflatflatten an array to a single array javascriptarray of array to one arrayhow to flat array or arrays angularflaten array javascriptjavascript how to read flast array 3fextrans nested array and flat in javascriptflat array method javascripthow to flatten array of objects javascriptflatten array nodejstypescript flatten array of arraysflatte arrayjs flatten array in arrayarray flatcollapse arrays within an arrayflatten array javascript function flattening a list in javascriptflattena rray jsflat array infinite jsjs array flattenflatten array of arrays with keys javascriptflat in arrayhow to unnest an array in javascriptflat javascript mdnjs unwrap array if single elementarray of array to one single arrayconvert array to flatjoin an array of arrays into one arrayflatteren in jsflatten array in array javascripthow to flatten a 2 d array in jsflat an array javascriptjavascript flat methodjs flatten 2d arrayflatten array function jsmerge nested arrays javascripthow to flatten an arryaflat the array of array into array in jsflatening an array in jsarray flatten jsarray of array js to one arrayflatten array of array in jsconvert array of arrays into single arrayjavascript flatten array of arraysmake nested array one arrayvalue flat jsflatten nested array in javascriptflat array as objects mdnwhat is array flattening in javascriptcombine nested arrays javascriptflat mdn jsflatten arr jsjs flattenconcat array of arrays jshow to reduce 2d array to one array javascriptarray flat javascripthow can i flat an array in javascript 3fjavascript flatnested array make it single array javascriptjavascript array unwraparray flattenflatten the array in javascriptflatten array of objects javascriptarray flat inside array of objecthow do i flatten an array thats in an array in jsjavascript array flat functionflatten js es6how to flatten js arrayhow to convert array of arrays into single arrayflatten jsarray flat es5javascript flatjs flatarrayjavascript flat functionmake a flat array from array of array listflatten 28array javascript 29js flatten arryflat an array javsacriptflatten an array of arrays javascriptmake array of arrays a single array javascripty jsflatten arraarry flatjs flatten array with flathow to flatten a 2d array in jsfaltten an array javascriptjavascript array of arrays create arrayjavascript flattenhow to flatten a nested array in javascriptjavascript array flattenflat array nodejsjs arrray flattenarray flatten tsflatten array of array jsflatter array of arrays javascripthow to flatten an array in js without an array functionarray flat javadcriptnode flatten arrayflatten two arrays javascriptflatten multidimensional array javascriptflaten arraysjoin array of arraysfaltten an array flat 28 29 javascriptarray flattening concept in javascriptarray and ovject flatten codejs es6 flatten arrayflatten method in javascriptflat infinity jsjavascript flatten array of stringsjavascript 2b nested array into single arraynested array and make into one javascriptflat an array in jsadd array of arrays into one array javascriptarray prototype flatjavascrpt flattenflatten in javascriptarray flat javascriptconvert nested array to single array javascriptarray of arrays to arrayarr flatflatten array node jsjs 2cflatjs arrays flatflatten list of lists javascriptarray flattetningflatten list jshow deep does array flat goarray flat in javascriptdeep flatten array jsflatten array attributes javascriptjavascript flatten a given arrayjs array of arrays flattenjavascript array flat allflat all array in array jshow to flatten and array in jsarray of arrays to array javascriptreduce multiple arrays into one javascriptflat functions in javascriptflatten an object to form an array jsjs 2c flat 28 29flatten get values in nodeflattening arrayflatten array js with constant spaceflatarray fromarray flatten es6flatten 28array 29 jsflattened arrray javascripthow to flar map jsnested array to single array typescript flatten javascriptnode js array flatjs flatten array of arrays into arrayflattrwen array jshow to flat array into one objectarrar flattenhow do i flatten an arrayflat array with hiralquyes6 flatten 28array 29how to flatten an array of arrayflat on arrayarray faltflatten for each javascriptmdn javascript array flatternarrays flattenflatten the array javascript flat 28 29 lengthconcat array of arrays javascriptjavascript best way to latten arrayflat infinity oesnt workjs flat 28 29js array flat allarray flatten jsjavascript flaten array of arrayjavascrip flatnode js flatten array 27mdn flat flat method es6 or es7flatten javascript arrrayhow to flatten an array of objects in javascriptarray flat javascript definitionfastes flattening array using concat in javascriptnested arrays javascript in oneflatten array of arrays in javascriptflatten array method flat jsflattening javascript arrayflat an array jshow to flatten an arr jsjavascript flatten array of objectarray flat javascript mdnjavascript flatten an arrayarray flat in jsflat the arraymdn flat 28 29javascript array flatten 28 29flat array methon in javascriptflat list jsarray flat in javascriptjs merge array of arrays into onearray flatremove array from array javascript flatarr flat 28 29flatten in jsjs flat infinityjs flatten arrflattening of arrayflat an array in javascirptjs array flat 28 29how to flatten an array of arrays javascript es6js conver nested array into arrayflatten array js without flatarray 3a 3aflatterhow to flatten array in javascriptjs 2c flatflatten array in javascriptjs unfold arrayflatten es6flatten array javascript spreadflatten arrayssflat arrayflatten array javacriptjavascript array as item of array flattenjs array how to flatflatten 2 arrays in javascriptoposite of array flatflat method in javascriptjs array prototype flattenarray js flattenarray flat combineshow to flatten a 2 dimensional array in javascript using reduce 28 29js make array flatjavascript unnest arrayarray flat arrayhow to return a flatten arrayjavascript code for flat arrayflatten array react jsarray flatten function javascripttypescript array flatjavascript flatten array of arrays orderedflat elements in array javascriptflat in javascriptflat array inside arrayhow to flatten an array jsjavascript flat arraymdn flatten an arrayjavascript flatten array and mergehow to flatten array of objects and arrays javascriptjavascript reduce multiple arrays to onejs concatenate array of arrayshow to flatten nested arraysjavascript join nested arraysqaush array javascriptes6 flatten array of 150 arrays javascriptflattenarray jsarray flattenjavascript flatten array of objectsjs flatten ajavascript how to flatten an arraynode js flatten arrayjs 2c flat 28 29 w3carray6 flat jsconvert nested arra y t o a single array in jsinfinity flat 28 29js convert 2d array to 1dreduce to flatten array filterflatten js functionflatten arary jshow to flat the array javascriptjs concat nested arraysflattening an array in javascriptget flat array from array of arraysjavascript flatten 2d arrayflat an array in javascriptflatten the array in js flat in jsjavascript flatten embedded arrays to array of objectshow to flatten an arrayflatter array jsunnest array javascriptflatten an array in javascriptflatten array in es6 without inbuilt functionsjoin array of arrays javascriptjs flatten an arrayhow to flatten array in nodejsjavascript arr fattenjs concat array of arraysarray flat method example in javascripthow to make nested array in to one arrayfunction flatten jsflatten raay in jses6 flatten arrayflatten node listflatten an array in jshow to flatten a nested array javascriptmake array flat jsjavascript array flatjs array flat infinitehow to fltten an array 2d jsflatten arrays javascriptflatten array of arrays es6flatten an array of objectsflatten array jsflattening a nested arrayreduce array of arrays into separate variables javascriptjavascript array of arrays flattenchanges object to array flattent data javascriptflattening array using concat in javascriptjavascript flat multidimensional arrayjavascript build array from flatmapflat out an arrayarr flat 28infinity 29 javascriptjs 2c flaten an arrayhow to flatten a aeray in javascripthow to make array of array to one array jsconcat to flatten an arrayarray flatten javascriptcollapse child arraysflattening arraysmdn array flathow di i flatten a 2d array jscombine array of arrays javascriptconver array of arrays to single arrayflat inifint jsjavascript flatten listhow to flat an array in javascript without using flat functionflat 28 29 javascriptarray methods javascript flatjavascript convert array to flat objectconcat array flattenflat infinity javascriptjs flatten the array flat node jsextract outer array in javascriptflat 28infinity 29deep flat array javascriptflatten array js vs forjavascript put child arrays in their own arrayarray flatten in javascripthow can i flatten array in javascript 3f flat 28infinity 29 in javascriptjs array flat nodejs flatten an array of arraysnodejs group array 10 array flatflatten arrays into one array javascriptflatten arrays jsflattening array of arrays jsflatten an array javascriptjavascript list flattenjavascript how to flatten a nested arrayflat es6js flat arrauflatten a array of arrys jsarr flathow to fltten an arrayhow to flatten a 2d array javascriptjavascript flatten array javascript isarrayflat array google scriptflat push arrays jsjavascript array flatten onlineflettern arrayjavascript flaten array and access the keyflat and reduce in javascriptjavascript unwrap single item in arrayjs how to flat arrflattening array javascriptjs array index not flatflatten array in arrayhow to flatten an array of arraysjavascript array flatjs flatten nested arrayreduce multiple arrays into oneflatten angular 8flat array of arrays javascript flat 28 29 2b javascriptalgorithm behind flat in jsflatten array 28 29return the flattened version of the arrayjs flatten array one leveljavacsript flatten arrayhow to flatten an array javascriptflat method javascriptjavascript flatten array with one value convertflatten two dimensional array javascriptwhat does flatten method in javascript doflatten infinite javasriptsarray flatten 28 29collapse an array to smaller items jsjs flatten array of stringswhat is flatten an arrayhow to flat array in javascriptflatten array javacdriptflatten javascript arrayarr flat 28array to array of arrays javascriptjs flatten 23js array flattenconvert array of arrays to array javascriptvue js array flat flat 28 29es6 flatten object of arraysarray flatjavascript flat sub arrayarray flatten js when to useways to flatten an array jsconver array of arrays to single array javascripthow to flat array javascriptflatten array object javascriptflatten an list of arrays in javascriptexpand array of arrayjs flatten araryflat nodejsconvert array to flat array of key valuesarray of arrays javascript flattenflatten array in jshow to flatten arrayflat mdnflatten array javascript without methodflattening of array javascriptflatten 28 29 javascriptarray flat nodejsturn array of arrays into one array javascriptexpand nested array javascriptflatten array of 150 arrays javascripthow to create array flatten function javascriptobject values 28 29 flat 28 29flatten 2d array jsarray flat es6javascript flattenarrwhat is to flaten an array jshow to turn a 2d array into a 1d array js flat methodflattens in jsarray of arrays to one arrayjs flatten nested arraysfrom array 2c return array of arrays with each item javascriptjs flatten allflat 28 29js array flat flatflatten a nested array in typescripthow to flatten a 2 d array in js with flatflatten a nested array javascriptarray flat infinityjavascript flatten one layerflatten nested array in objectjs flat array of arrayjavascript flatten an array of arraysflatten array of satrings javascriptarray flat 28 29 jsflatten js object keysjavascript array of arrays into single arrayarray prototype myflattenjavascript array flatjavascript make one array of arraysarray of arrays flatten javascriptjavascript flattern arrayhow to flatten a 2 dimensional array in javascriptmerge nested arrays jsflatten matrix javascriptjs flat by keyjs flatten array w3flattening the arrayturn an array of arrays into a single arrayjs flat arrayjs array flattenhow to flatten collection with arraysfaltten mdnjs flatten object of arraysjs flatjs array flatten whyflatten arrays within arraysarray flat js concatnumpy flatten arrayarray flat 28 29 javascriptflat 28 29 3bpush flat in reduce javascriptjavascript reduce myflattenflatten a nested arrayjs array flatnested arrays into a single arrayarray flatten mdn flat method angularflat i jsflatten array of arrays javascriptflattening jsjavascript flatten array of arrays