Remove Last Comma from a string

Question

Using JavaScript  how can I remove the last comma   but only if the comma is the last character or if there is only white space after the comma  This is my code  I got a working fiddle  But it has a bug    var str    This  is a test     alert  removeLastComma str        should remain unchanged  var str    This  is a test     alert  removeLastComma str        should remove the last comma  var str    This is a test               alert  removeLastComma str        should remove the last comma  function removeLastComma strng               var n strng lastIndexOf           var a strng substring 0 n       return a

User · Answer

First  one should check if the last character is a comma  If it exists  remove it   if  str indexOf      this length -     length      -1        str   str substring 0  str length - 1       NOTE str indexOf      this length -     length  can be simplified to str indexOf      this length - 1

User · Answer

you can remove last comma from a string by using slice   method  find the below example   var strVal     trim     txtValue   val     var lastChar   strVal slice -1   if  lastChar               strVal   strVal slice 0  -1       Here is an Example   x000D   x000D  function myFunction     x000D   var strVal     trim     txtValue   text     x000D   var lastChar   strVal slice -1   x000D   if  lastChar              check last character is string x000D    strVal   strVal slice 0  -1      trim last character x000D        demo   text strVal   x000D     x000D    x000D   lt script src  https   cdnjs cloudflare com ajax libs jquery 3 3 1 jquery min js  gt  lt  script gt  x000D   x000D   x000D   lt p class  txtValue  gt Striing with Commma  lt  p gt  x000D   x000D   lt button onclick  myFunction    gt Try it lt  button gt  x000D   x000D   lt p id  demo  gt  lt  p gt  x000D   x000D   x000D

User · Answer

In case its useful or a better way  str   str replace    s    s        quot  quot     It will replace all following combination end of the string  1    lt no space gt  2    lt spaces gt   3                4   lt spaces gt  5   lt spaces gt   6   lt spaces gt   lt spaces gt

User · Answer

The problem is that you remove the last comma in the string  not the comma if it s the last thing in the string  So you should put an if to check if the last char is     and change it if it is   EDIT  Is it really that confusing    This  is a random string   Your code finds the last comma from the string and stores only  This    because  the last comma is after  This  not at the end of the string

User · Answer

function removeLastComma str       return str replace     s

User · Answer

long shot here  var sentence  I got   commas  here    var pattern    g  var currentIndex  while  pattern test sentence   true           currentIndex pattern lastIndex     if currentIndex  sentence trim   length  alert sentence substring 0 currentIndex-1    else  alert sentence

User · Answer

Remove last comma  Working example   x000D   x000D  function truncateText     x000D    var str  document getElementById  input   value  x000D    str   str replace    s          x000D    console log str   x000D    x000D   lt input id  input  value  address line one    gt  x000D   lt button onclick  truncateText    gt Truncate lt  button gt  x000D   x000D   x000D

User · Answer

The greatly upvoted answer removes not only the final comma  but also any spaces that follow  But removing those following spaces was not what was part of the original problem  So   let str    abc def ghi     let str2   str replace       s           alert       str2          abc def ghi     https   jsfiddle net dc8moa3k

User · Answer

This will remove the last comma and any whitespace after it   str   str replace    s            It uses a regular expression    The   mark the beginning and end of the regular expression The   matches the comma The  s means whitespace characters  space  tab  etc  and the   means 0 or more The   at the end signifies the end of the string

User · Answer

you can remove last comma   var sentence    I got   commas  here    sentence   sentence replace             1    console log sentence

[javascript] Remove Last Comma from a string

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