Javascript - sort array based on another array

Question

Is it possible to sort and rearrange an array that looks like this   itemsArray            Anne    a          Bob    b          Henry    b          Andrew    d          Jason    c          Thomas    b       to match the arrangement of this array   sortingArr      b    c    b    b    a    d      Unfortunately  I don   t have any IDs to keep track on  I would need to priority the items-array to match the sortingArr as close as possible   Update   Here is the output I   m looking for   itemsArray               Bob    b          Jason    c          Henry    b          Thomas    b         Anne    a          Andrew    d        Any idea how this can be done

User · Answer

ES6   const arrayMap   itemsArray reduce     accumulator  currentValue    gt            accumulator       currentValue 1    currentValue                const result   sortingArr map key   gt  arrayMap key      More examples with different input arrays

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I had to do this for a JSON payload I receive from an API  but it wasn t in the order I wanted it   Array to be the reference array  the one you want the second array sorted by   var columns          last name   last name         first name   first name         book description   book description         book id   book id         book number   book number         due date   due date         loaned out   loaned out        I did these as objects because these will have other properties eventually     Created array    var referenceArray       for  var key in columns         for  var j in columns key             referenceArray push j                Used this with result set from database   I don t know how efficient it is but with the few number of columns I used  it worked fine   result forEach  element  index  array    gt                                    var tr   document createElement  tr        for  var i   0  i  lt  referenceArray length - 1  i              var td   document createElement  td            td innerHTML   element referenceArray i            tr appendChild td              tableBody appendChild tr

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This is what I was looking for and I did for sorting an Array of Arrays based on another Array      It s On 3 and might not be the best practice ES6     x000D   x000D  function sortArray arr  arr1   x000D        return arr map item   gt    x000D          let a       x000D          for let i 0  i lt  arr1 length  i     x000D            for  const el of item    x000D              if el    arr1 i    x000D                a push el   x000D                   x000D                x000D              x000D            return a  x000D            x000D        x000D       x000D      const arr1     fname    city    name    x000D    const arr      fname    city    name    x000D      fname    city    name    name    city   fname     x000D    console log sortArray arr arr1    x000D   x000D   x000D   It might help someone

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const result   sortingArr map  i    gt        const pos   itemsArray findIndex j   gt  j 1      i       const item   itemsArray pos       itemsArray splice pos  1       return item

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I would use an intermediary object  itemsMap   thus avoiding quadratic complexity   function createItemsMap itemsArray         a     Anne     b     Bob    Henry           var itemsMap         for  var i   0  item   item   itemsArray i      i         itemsMap item 1       itemsMap item 1          push item 0          return itemsMap     function sortByKeys itemsArray  sortingArr      var itemsMap   createItemsMap itemsArray   result         for  var i   0  i  lt  sortingArr length    i        var key   sortingArr i       result push  itemsMap key  shift    key          return result      See http   jsfiddle net eUskE

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For getting a new ordered array  you could take a Map and collect all items with the wanted key in an array and map the wanted ordered keys by taking sifted element of the wanted group    x000D   x000D  var itemsArray      Anne    a      Bob    b      Henry    b      Andrew    d      Jason    c      Thomas    b     x000D      sortingArr      b    c    b    b    a    d     x000D      map   itemsArray reduce  m  a    gt  m set a 1    m get a 1          concat  a     new Map   x000D      result   sortingArr map k   gt   map get k         shift     x000D   x000D  console log result   x000D   x000D   x000D

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You can do something like this   function getSorted itemsArray   sortingArr       var result         for var i 0  i lt arr length  i          result i    arr sortArr i          return result      You can test it out here   Note  this assumes the arrays you pass in are equivalent in size  you d need to add some additional checks if this may not be the case   refer link  refer

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If you use the native array sort function  you can pass in a custom comparator to be used when sorting the array  The comparator should return a negative number if the first value is less than the second  zero if they re equal  and a positive number if the first value is greater   So if I understand the example you re giving correctly  you could do something like   function sortFunc a  b      var sortingArr      b    c    b    b    c    d       return sortingArr indexOf a 1   - sortingArr indexOf b 1       itemsArray sort sortFunc

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x000D   x000D  function sortFunc a  b      var sortingArr     A    B    C      return sortingArr indexOf a type  - sortingArr indexOf b type      const itemsArray             type   A                type   C                type   B           console log itemsArray   itemsArray sort sortFunc   console log itemsArray   x000D   x000D   x000D

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Why not something like    array1  array of elements to be sorted   array2  array with the indexes  array1   array2 map  object  i    gt  array1 object      The map function may not be available on all versions of Javascript

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let a     A    B    C     let b    3  2  1   let c    1 0  5 0  2 0      these array can be sorted by sorting order of b  const zip   rows   gt  rows 0  map     c    gt  rows map row   gt  row c     const sortBy    a  b  c    gt      const zippedArray   zip  a  b  c     const sortedZipped   zippedArray sort  x  y    gt  x 1  - y 1      return zip sortedZipped     sortBy a  b  c

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Case 1  Original Question  No Libraries   Plenty of other answers that work      Case 2  Original Question  Lodash js or Underscore js   var groups     groupBy itemArray  1   var result     map sortArray  function  i    return groups i  shift          Case 3  Sort Array1 as if it were Array2  I m guessing that most people came here looking for an equivalent to PHP s array multisort  I did  so I thought I d post that answer as well  There are a couple options   1  There s an existing JS implementation of array multisort    Thanks to  Adnan for pointing it out in the comments  It is pretty large  though   2  Write your own   JSFiddle demo   function refSort  targetData  refData         Create an array of indices  0  1  2     N     var indices   Object keys refData         Sort array of indices according to the reference data    indices sort function indexA  indexB        if  refData indexA   lt  refData indexB           return -1        else if  refData indexA   gt  refData indexB           return 1            return 0              Map array of indices to corresponding values of the target array    return indices map function index        return targetData index             3  Lodash js or Underscore js  both popular  smaller libraries that focus on performance  offer helper functions that allow you to do this       var result     chain sortArray         pairs          sortBy 1         map function  i    return itemArray i 0              value         Which will  1  group the sortArray into  index  value  pairs   2  sort them by the value  you can also provide a callback here    3  replace each of the pairs with the item from the itemArray at the index the pair originated from

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Use the   inArray   method from jQuery  You then could do something like this  var sortingArr      b    c    b    b    c    d     var newSortedArray   new Array     for var i sortingArr length  i--      var foundIn     inArray sortingArr i   itemsArray    newSortedArray push itemsArray foundIn

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let sortedOrder      b    c    b    b    let itemsArray            Anne    a          Bob    b          Henry    b          Andrew    d          Jason    c          Thomas    b     a itemsArray function  a  b        let A   a 1      let B   b 1       if A    undefined          A   A toLowerCase        if B    undefined          B   B toLowerCase        let indA   sortedOrder indexOf A      let indB   sortedOrder indexOf B       if  indA    -1           indA   sortedOrder length-1     if  indB    -1          indB   sortedOrder length-1      if  indA  lt  indB             return -1        else if  indA  gt  indB            return 1            return 0       This solution will append the objects at the end if the sorting key is not present in reference array

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One Line answer   itemsArray sort function a  b       return sortingArr indexOf a  - sortingArr indexOf b

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this should works   var i search  itemsArraySorted       while sortingArr length        search   sortingArr shift        for i   0  i lt itemsArray length  i              if itemsArray i  1     search                itemsArraySorted push itemsArray i                break                      itemsArray   itemsArraySorted

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var sortedArray       for var i 0  i  lt  sortingArr length  i          var found   false      for var j 0  j  lt  itemsArray length  amp  amp   found  j              if itemsArray j  1     sortingArr i                 sortedArray push itemsArray j                itemsArray splice j 1               found   true                      http   jsfiddle net s7b2P   Resulting order  Bob Jason Henry Thomas Anne Andrew

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Use intersection of two arrays   Ex    var sortArray     a    b    c     d    e     var arrayToBeSort     z    s    b     e    a       intersection sortArray  arrayToBeSort          a    b    e    if  z and  s  are out of range of first array   append it at the end of result

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this is probably too late but  you could also use some modified version of the code below in ES6 style  This code is for arrays like   var arrayToBeSorted    1 2 3 4 5   var arrayWithReferenceOrder    3 5 8 9     The actual operation    arrayToBeSorted   arrayWithReferenceOrder filter v   gt  arrayToBeSorted includes v      The actual operation in ES5    arrayToBeSorted   arrayWithReferenceOrder filter function v        return arrayToBeSorted includes v         Should result in arrayToBeSorted    3 5   Does not destroy the reference array

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In case you get here needing to do this with an array of objects  here is an adaptation of  Durgpal Singh s awesome answer  const itemsArray         name   Anne   id   a         name   Bob   id   b         name   Henry   id   b         name   Andrew   id   d         name   Jason   id   c         name   Thomas   id   b       const sortingArr      b    c    b    b    a    d     Object keys itemsArray  sort  a  b    gt      return sortingArr indexOf itemsArray a  id  - sortingArr indexOf itemsArray b  id

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Something like   items            Anne    a          Bob    b          Henry    b          Andrew    d          Jason    c          Thomas    b      sorting      b    c    b    b    c    d     result       sorting forEach function key        var found   false      items   items filter function item            if  found  amp  amp  item 1     key                result push item               found   true              return false            else              return true             result forEach function item        document writeln item 0       Bob Jason Henry Thomas Andrew      Here s a shorter code  but it destroys the sorting array   result   items map function item        var n   sorting indexOf item 1        sorting n            return  n  item     sort   map function j    return j 1

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with numerical sortingArr  itemsArray sort function a  b       return sortingArr itemsArray indexOf a   - sortingArr itemsArray indexOf b

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this arrToBeSorted    this arrToBeSorted sort function a  b       return uppthis sorrtingByArray findIndex x   gt  x Id    a ByPramaeterSorted  - uppthis sorrtingByArray findIndex x   gt  x Id    b ByPramaeterSorted

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You could try this method    const sortListByRanking    rankingList  listToSort    gt      let result         for  let id of rankingList        for  let item of listToSort          if  item  amp  amp  item 1      id            result push item                       return result

[javascript] Javascript - sort array based on another array

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