How can I convert a comma-separated string to an array

Question

I have a comma-separated string that I want to convert into an array  so I can loop through it  Is there anything built-in to do this  For example  I have this string var str    quot January February March April May June July August September October November December quot    Now I want to split this by the comma  and then store it in an array

User · Answer

Here is a function that will convert a string to an array, even if there is only one item in the list (no separator character):

function listToAray(fullString, separator) {
  var fullArray = [];

  if (fullString !== undefined) {
    if (fullString.indexOf(separator) == -1) {
      fullAray.push(fullString);
    } else {
      fullArray = fullString.split(separator);
    }
  }

  return fullArray;
}

Use it like this:

var myString = 'alpha,bravo,charlie,delta';
var myArray = listToArray(myString, ',');
myArray[2]; // charlie

var yourString = 'echo';
var yourArray = listToArray(yourString, ',');
yourArray[0]; // echo

I created this function because split throws out an error if there isn't any separator character in the string (only one item).

User · Answer

Watch out if you are aiming at integers  like 1 2 3 4 5  If you intend to use the elements of your array as integers and not as strings after splitting the string  consider converting them into such  var str    quot 1 2 3 4 5 6 quot   var temp   new Array       This will return an array with strings  quot 1 quot    quot 2 quot   etc  temp   str split  quot   quot     Adding a loop like this  for  a in temp         temp a    parseInt temp a   10      Explicitly include base as per   lvaro s comment    will return an array containing integers  and not strings

User · Answer

I had a similar issue  but more complex as I needed to transform a CSV file into an array of arrays  each line is one array element that inside has an array of items split by comma   The easiest solution  and more secure I bet  was to use PapaParse which has a  quot no-header quot  option that transform the CSV file into an array of arrays  plus  it automatically detected the  quot   quot  as my delimiter  Plus  it is registered in Bower  so I only had to  bower install papa-parse --save  And then use it in my code as follows  var arrayOfArrays   Papa parse csvStringWithEnters    header false   data   I really liked it

User · Answer

Pass your comma-separated string into this function and it will return an array  and if a comma-separated string is not found then it will return null  function splitTheString CommaSepStr        var ResultArray   null          Check if the string is null or so      if  CommaSepStr   null             var SplitChars                    Check if the string has comma of not will go to else         if  CommaSepStr indexOf SplitChars   gt   0                ResultArray   CommaSepStr split SplitChars                      else                   The string has only one value  and we can also check                the length of the string or time and cross-check too              ResultArray    CommaSepStr                       return ResultArray

User · Answer

The split   method is used to split a string into an array of substrings  and returns the new array   var array   string split

User · Answer

let str    January February March April May June July August September October November December   let arr   str split         it will result     January    February    March    April    May    June    July    August    September    October    November    December     and if you want to convert following to     January    February    March    April    May    June    July    August    September    October    November    December     this     January February March April May June July August September October November December     use   str   arr join

User · Answer

Note that the following  var a    quot  quot   var x   new Array    x   a split  quot   quot    alert x length    will alert 1

User · Answer

A good solution for that  let obj     A   B   C    obj map  c    gt    return c     join

User · Answer

Return function var array    new Function  quot return   quot    str   quot    quot        Its accept string and objectstrings  var string    quot 0 1 quot    var objectstring     Name  quot Tshirt quot   CatGroupName  quot Clothes quot   Gender  quot male-female quot     Name  quot Dress quot   CatGroupName  quot Clothes quot   Gender  quot female quot     Name  quot Belt quot   CatGroupName  quot Leather quot   Gender  quot child quot      var stringArray    new Function  quot return   quot    string   quot    quot        var objectStringArray    new Function  quot return   quot    objectstring   quot    quot        JSFiddle  https   jsfiddle net 7ne9L4Lj 1

User · Answer

Shortest  str split       x000D   x000D  var str    January February March April May June July August September October November December   x000D   x000D  let arr   str split     x000D   x000D  console log arr   x000D   x000D   x000D

User · Answer

For an array of strings to a comma-separated string  let months     quot January quot   quot Feb quot    let monthsString   months join  quot    quot

User · Answer

Hmm  split is dangerous IMHO as a string can always contain a comma  Observe the following  var myArr    quot a b c d e f g     quot   result   myArr split        So how would you interpret that  And what do you want the result to be  An array with    a    b    c    d    e    f    g               or   a    b    c    d    e    f    g         Even if you escape the comma  you d have a problem  I quickly fiddled this together   function            extend           splitAttrString  function theStr                var attrs                    var RefString   function s                    this value   s                             RefString prototype toString   function                     return this value                             RefString prototype charAt   String prototype charAt              var data   new RefString theStr                var getBlock   function endChr  restString                    var block                       var currChr                       while   currChr    endChr   amp  amp   restString value                                if      quot   test currChr                             block     trim block    getBlock currChr  restString                                             else if       test currChr                             block     trim block    getBlock      restString                                             else if       test currChr                             block     trim block    getBlock      restString                                             else                           block    currChr                                            currChr   restString charAt 0                       restString value   restString value slice 1                                     return   trim block                               do                   var attr   getBlock      data                   attrs push attr                             while  data value                                       return attrs                       jQuery

User · Answer

You can try the following snippet   var str    quot How are you doing today  quot       var res   str split  quot   quot        console log  quot My Result  quot   res

User · Answer

As  oportocala mentions  an empty string will not result in the expected empty array  So to counter  do  str  split       map entry   gt  entry trim     filter entry   gt  entry   For an array of expected integers  do  str  split       map entry   gt  parseInt entry    filter entry   gt  typeof entry     number

User · Answer

var array   string split         MDN reference  mostly helpful for the possibly unexpected behavior of the limit parameter   Hint   a b c  split      2  comes out to   a    b    not   a    b c

[javascript] How can I convert a comma-separated string to an array?

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