split string in two on given index and return both parts

Question

I have a string that I need to split on a given index and then return both parts  seperated by a comma  For example   string  8211   8 211         98700   98 700   So I need to be able to split the string on any given index and then return both halves of the string  Built in methods seem to perform the split but only return one part of the split   string slice only return extracted part of the string  string split only allows you to split on character not index string substring does what I need but only returns the substring string substr very similar - still only returns the substring

User · Answer

You can also do it like this  https   jsfiddle net Devashish2910 8hbosLj3 1   amp togetherjs iugeGcColp  var str  result  str   prompt  Enter Any Number     var valueSplit   function  value  length        if  length  lt  7            var index   length - 3          return str slice 0  index          str slice index             else if  length  lt  10  amp  amp  length  gt  6            var index1  index2          index1   length - 6          index2   length - 3          return str slice 0 index1          str slice index1 index2          str slice index2            result   valueSplit str  str length   alert result

User · Answer

If code elegance ranks higher than the performance hit of regex  then   1234567  match          3     slice 1  join        gt   1234 567    There s a lot of room to further modify the regex to be more precise   If join   doesn t work then you might need to use map with a closure  at which point the other answers here may be less bytes and line noise

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Something like this       function stringConverter varString  varCommaPosition        var stringArray   varString split         var outputString          for var i 0 i lt stringArray length i              if i    varCommaPosition                  outputString   outputString                      outputString   outputString   stringArray i              return outputString

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function splitText value  index      if  value length  lt  index   return value      return  value substring 0  index   concat splitText value substring index   index      console log splitText  this is a testing peace of text  10         this is a     testing pe    ace of tex    t      For those who want to split a text into array using the index

User · Answer

If you want a really hacky one-liner using regular expressions and interpolated strings     x000D   x000D  const splitString    value  idx    gt  value split new RegExp     lt       idx        console log splitString  abcdefgh   5    x000D   x000D   x000D   This code says split the string by replacing the value returned in the regex   The regex returns a position  not a character  so we don t lose in characters in the initial string   The way it does this is finding the position  via a look-behind and the   anchor  where there were index characters from the start of the string   To solve your proposed problem of adding commas every third position from the end  the regex would be slightly different and we d use replace rather than split   x000D   x000D  const values     8211  98700  1234567890    const addCommas    value  idx    gt  value replace new RegExp          idx          g           console log values map v   gt  addCommas v toString    3     x000D   x000D   x000D   Here we find the idxth position from the end by using a look-ahead and the   anchor  but we also capture any number of those sets of positions from the end   Then we replace the position with a comma   We use the g flag  global  so it replaces every occurrence  not just the first found

User · Answer

ES6 1-liner   x000D   x000D        splitAt   number   gt  Array lt any gt  string   gt  Array lt Array lt any gt  string gt  x000D  const splitAt   index   gt  x   gt   x slice 0  index   x slice index   x000D   x000D  console log  x000D    splitAt 1   foo         f    oo   x000D    splitAt 2   1  2  3  4        1  2    3  4   x000D    x000D     x000D   x000D   x000D

User · Answer

You can easily expand it to split on multiple indexes  and to take an array or string  const splitOn    slicable     indices    gt     0     indices  map  n  i  m    gt  slicable slice n  m i   1      splitOn  foo   1        f    oo    splitOn  1  2  3  4   2        1  2    3  4    splitOn  fooBAr   1  4         f    ooB    Ar     lodash issue tracker  https   github com lodash lodash issues 3014

User · Answer

You can also use number formatter JS available at   https   code google com p javascript-number-formatter   Format options   http   jsfiddle net chauhangs hUE3h     format            98700    format           8211

User · Answer

Try this  x000D   x000D  function split at index value  index     return value substring 0  index          value substring index      console log split at index  3123124   2    x000D   x000D   x000D

[javascript] split string in two on given index and return both parts

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