Convert integer into its character equivalent where 0 a 1 b etc

Question

I want to convert an integer into its character equivalent based on the alphabet  For example   0   gt  a 1   gt  b 2   gt  c 3   gt  d   etc  I could build an array and just look it up when I need it but I   m wondering if there   s a built in function to do this for me  All the examples I   ve found via Google are working with ASCII values and not a character   s position in the alphabet

User · Accepted Answer

Assuming you want lower case letters   var chr   String fromCharCode 97   n      where n is 0  1  2       97 is the ASCII code for lower case  a   If you want uppercase letters  replace 97 with 65  uppercase  A    Note that if n  gt  25  you will get out of the range of letters

User · Answer

Try   n 10  toString 36     x000D   x000D  chr   n  gt  n 10  toString 36   x000D   x000D  for i 0  i lt 26  i    console log    i    gt     chr i       x000D   x000D   x000D

User · Answer

The only problemo with  mikemaccana s great solution is that it uses the binary    operator which is costly  performance-wise  I suggest this modification to his great work as a slight improvement that your colleagues can perhaps read more easily   const getColumnName    i    gt         const previousLetters    i  gt   26   getColumnName Math floor i   26  -1               const lastLetter    ABCDEFGHIJKLMNOPQRSTUVWXYZ  i   26         return previousLetters   lastLetter      Or as a one-liner  const getColumnName   i   gt   i  gt   26   getColumnName Math floor i   26  -1            ABCDEFGHIJKLMNOPQRSTUVWXYZ  i   26     Example   getColumnName 0       A  getColumnName 1       B  getColumnName 25       Z  getColumnName 26       AA  getColumnName 27       AB  getColumnName 80085      DNLF

User · Answer

Javascript s String fromCharCode code1  code2       codeN  takes an infinite number of arguments and returns a string of letters whose corresponding ASCII values are code1  code2      codeN  Since 97 is  a  in ASCII  we can adjust for your indexing by adding 97 to your index   function indexToChar i      return String fromCharCode i 97     97 in ASCII is  a   so i 0 returns  a                                           i 1 returns  b   etc

User · Answer

A simple answer would be  26 characters    String fromCharCode 97 n     If space is precious you could do the following  20 characters     10 n  toString 36     Think about what you could do with all those extra bytes   How this works is you convert the number to base 36  so you have the following characters   0123456789abcdefghijklmnopqrstuvwxyz             n        n 10   By offsetting by 10 the characters start at a instead of 0   Not entirely sure about how fast running the two different examples client-side would compare though

User · Answer

I don t like all the solutions that use magic numbers like 97 or 36   const A    A  charCodeAt 0    let numberToCharacter   number   gt  String fromCharCode A   number    let characterToNumber   character   gt  character charCodeAt 0  - A    this assumes uppercase letters and starts  A  at 0

User · Answer

There you go   a-zA-Z    function codeToChar  number       if   number  gt   0  amp  amp  number  lt   25      a-z     number   number   97    else if   number  gt   26  amp  amp  number  lt   51      A-Z     number   number    65-26     else     return false     range error   return String fromCharCode  number        input  0-51  or it will return false  range error    OR   var codeToChar   function       var abc    abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ  split        return function  code         return abc code                returns undefined in case of range error  NOTE  the array will be created only once and because of closure it will be available for the the new codeToChar function  I guess it s even faster then the first method  it s just a lookup basically

User · Answer

If you are looking for TypeScript working functions then follow public numericValue    alphaChar  any    gt  alphaChar toUpperCase   charCodeAt 0  - 64   public alphaValue    numericDigit  any    gt      String fromCharCode 64   numericDigit         You can make several checks like  numericDigit  gt   1  amp  amp  numericDigit  lt   26     inside function body as per the requirements

User · Answer

Use String fromCharCode  This returns a string from a Unicode value  which matches the first 128 characters of ASCII   var a   String fromCharCode 97

User · Answer

Assuming you want uppercase case letters   function numberToLetter num           var alf                0    A    1    B    2    C    3    D    4    E    5    F    6    G                     if num length   1  return alf num                  return num split     map numberToLetter           Example   numberToLetter  023   is   A    C    D    numberToLetter  5   is  F

User · Answer

Will be more portable in case of extending to other alphabets     char  abcdefghijklmnopqrstuvwxyz  code    or  to be more compatible  with our beloved IE    char  abcdefghijklmnopqrstuvwxyz  charAt code

User · Answer

If you don t mind getting multi-character strings back  you can support arbitrary positive indices   function idOf i        return  i  gt   26   idOf  i   26  gt  gt  0  - 1            abcdefghijklmnopqrstuvwxyz  i   26  gt  gt  0      idOf 0     a idOf 1     b idOf 25     z idOf 26     aa idOf 27     ab idOf 701     zz idOf 702     aaa idOf 703     aab    Not thoroughly tested for precision errors

[javascript] Convert integer into its character equivalent, where 0 => a, 1 => b, etc

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