How to convert Set to Array

Question

Set seems like a nice way to create Arrays with guaranteed unique elements  but it does not expose any good way to get properties  except for generator  Set  values  which is called in an awkward way of mySet values next     This would have been ok  if you could call map and similar functions on Sets  But you cannot do that  as well   I ve tried Array from  but seems to be converting only array-like  NodeList and TypedArrays    objects to Array  Another try  Object keys does not work for Sets  and Set prototype does not have similar static method   So  the question  Is there any convenient inbuilt method for creating an Array with values of a given Set    Order of element does not really matter    if no such option exists  then maybe there is a nice idiomatic one-liner for doing that   like  using for   of  or similar

User · Answer

via https   speakerdeck com anguscroll es6-uncensored by Angus Croll  It turns out  we can use spread operator   var myArr       mySet     Or  alternatively  use Array from   var myArr   Array from mySet

User · Answer

Here is an easy way to get only unique raw values from array  If you convert the array to Set and after this  do the conversion from Set to array  This conversion works only for raw values  for objects in the array it is not valid  Try it by yourself       let myObj1             name   Dany           age  35          address   str  My street N5             let myObj2             name   Dany           age  35          address   str  My street N5             var myArray    55  44  65  myObj1  44  myObj2  15  25  65  30       console log myArray        var mySet   new Set myArray       console log mySet        console log mySet size     myArray length        The size differs because Set has only unique items      let uniqueArray       mySet       console log uniqueArray           Here you will see your new array have only unique elements with raw         values  The objects are not filtered as unique values by Set         Try it by yourself

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Perhaps to late to the party  but you could just do the following   const set   new Set   a    b     const values   set values    const array   Array from values     This should work without problems in browsers that have support for ES6 or if you have a shim that correctly polyfills the above functionality   Edit  Today you can just use what  c69 suggests   const set   new Set   a    b     const array       set      or Array from set

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The code below creates a set from an array and then  using the     operator   var arr  1 2 3 4 5 6 7 8 9 1 2 3 4 5 6 7 8 9    var set new Set arr   let setarr     set   console log setarr

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Use spread Operator to get your desired result  var arrayFromSet       set

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In my case the solution was   var testSet   new Set    var testArray        testSet add  1    testSet add  2    testSet add  2       duplicate item testSet add  3     var someFunction   function  value1  value2  setItself        testArray push value1       testSet forEach someFunction    console log  testArray      testArray     value1 equals value2    The value contained in the the current position in the Set  The same value is passed for both arguments   Worked under IE11

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Using Set and converting it to an array is very similar to copying an Array     So you can use the same methods for copying an array which is very easy in ES6  For example  you can use      Imagine you have this Set below   const a   new Set   Alireza    Dezfoolian    is    a    developer       You can simply convert it using   const b       a     and the result is      Alireza    Dezfoolian    is    a    developer     An array and now you can use all methods that you can use for an array     Other common ways of doing it   const b   Array from a     or using loops like   const b       a forEach v   gt  b push v

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I would prefer to start with removing duplications from an array and then try to sort  Return the 1st element from new array      function processData myArray            var s   new Set myArray           var arr       s           return arr sort  a b    gt  b-a  1                  console log processData  2 3 6 6 5

User · Answer

Assuming you are just using Set temporarily to get unique values in an array and then converting back to an Array  try using this     uniq       This relies on using underscore or lo-dash

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if no such option exists  then maybe there is a nice idiomatic   one-liner for doing that   like  using for   of  or similar     Indeed  there are several ways to convert a Set to an Array     using Array from  let array   Array from mySet     Simply spreading the Set out in an array  let array       mySet     The old fashion way  iterating and pushing to a new array  Sets do have forEach   let array       mySet forEach v   gt  array push v      Previously  using the non-standard  and now deprecated array comprehension syntax   let array    v for  v of mySet

User · Answer

SIMPLEST ANSWER  just spread the set inside     let mySet   new Set   mySet add 1  mySet add 5  mySet add 5   let arr       mySet     Result   1 5

[javascript] How to convert Set to Array?

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