How to Compare two Arrays are Equal using Javascript

Question

I want position of the array is to be also same and value also same   var array1    4 8 9 10   var array2    4 8 9 10     I tried like this  var array3   array1     array2      returns false

User · Answer

function isEqual a    if  arrayData length  gt  0        for  var i in arrayData            if  JSON stringify arrayData i       JSON stringify a                 alert  Ya existe un registro con esta informacion                return false                        Check this example

User · Answer

var array3   array1     array2   That will compare whether array1 and array2 are the same array object in memory  which is not what you want     In order to do what you want  you ll need to check whether the two arrays have the same length  and that each member in each index is identical    Assuming your array is filled with primitives   numbers and or strings   something like this should do  function arraysAreIdentical arr1  arr2       if  arr1 length     arr2 length  return false      for  var i   0  len   arr1 length  i  lt  len  i             if  arr1 i      arr2 i                return false                      return true

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Here goes the code  Which is able to compare arrays by any position     var array1    4 8 10 9    var array2    10 8 9 4    var is same   array1 length    array2 length  amp  amp  array1 every function element  index          return element     array2 index     if array2 indexOf element  gt -1       return element   array2 array2 indexOf element            console log is same

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You could try this simple approach   x000D   x000D  var array1    4 8 9 10   x000D  var array2    4 8 9 10   x000D   x000D  console log array1 join        x000D  console log array2 join        x000D   x000D  if  array1 join          array2 join         x000D   console log  The arrays are equal     x000D    else   x000D   console log  The arrays are NOT equal     x000D    x000D   x000D  array1     1 2   3 4   5 6   7 8    x000D  array2     1 2   3 4   5 6   7 8    x000D   x000D  console log array1 join        x000D  console log array2 join        x000D   x000D  if  array1 join          array2 join         x000D   console log  The arrays are equal     x000D    else   x000D   console log  The arrays are NOT equal     x000D    x000D   x000D   x000D    If the position of the values are not important you could sort the arrays first   if  array1 sort   join          array2 sort   join             console log  The arrays are equal       else       console log  The arrays are NOT equal

User · Answer

A less robust approach  but it works   a    2  4  5  toString    b    2  4  5  toString     console log a   b

User · Answer

If you comparing 2 arrays but values not in same index  then try this  var array1  1 2 3 4  var array2  1 4 3 2  var is equal   array1 length  array2 length  amp  amp  array1 every function v i    return    inArray v array2     -1    console log is equal

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Try doing like this     array1 compare array2  true  Array prototype compare   function  array           if the other array is a falsy value  return     if   array          return false          compare lengths - can save a lot of time     if  this length    array length          return false       for  var i   0  l this length  i  lt  l  i                 Check if we have nested arrays         if  this i  instanceof Array  amp  amp  array i  instanceof Array                   recurse into the nested arrays             if   this i  compare array i                    return false                    else if  this i     array i                    Warning - two different object instances will never be equal   x 20      x 20              return false                      return true

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A more modern version   function arraysEqual a  b      a   Array isArray a    a         b   Array isArray b    b         return a length     b length  amp  amp  a every  el  ix    gt  el     b ix        Coercing non-array arguments to empty arrays stops a every   from exploding   If you just want to see if the arrays have the same set of elements then you can use Array includes     function arraysContainSame a  b      a   Array isArray a    a         b   Array isArray b    b         return a length     b length  amp  amp  a every el   gt  b includes el

User · Answer

Use lodash  In ES6 syntax   import isEqual from  lodash isEqual   let equal   isEqual  1 2    1 2        true   Or previous js versions   var isEqual   require  lodash isEqual    var equal   isEqual  1 2    1 2        true

User · Answer

You could use Array prototype every    A polyfill is needed for IE  lt  9 and other old browsers    var array1    4 8 9 10   var array2    4 8 9 10    var is same    array1 length    array2 length   amp  amp  array1 every function element  index        return element     array2 index          THE WORKING DEMO

[javascript] How to Compare two Arrays are Equal using Javascript?

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