How can I remove a character from a string using JavaScript

Question

I am so close to getting this  but it just isn t right  All I would like to do is remove the character r from a string  The problem is  there is more than one instance of r in the string  However  it is always the character at index 4  so the 5th character   Example string  crt r2002 2 What I want  crt 2002 2 This replace function removes both r mystring replace  r g       Produces  ct 2002 2 I tried this function  String prototype replaceAt   function  index  char        return this substr 0  index    char   this substr index   char length     mystring replaceAt 4       It only works if I replace it with another character  It will not simply remove it  Any thoughts

User · Answer

This is improvement of simpleigh answer (omit length)

s.slice(0, 4) + s.slice(5)

_x000D_

let s = "crt/r2002_2";
let o = s.slice(0, 4) + s.slice(5);
let delAtIdx = (s, i) => s.slice(0, i) + s.slice(i + 1); // this function remove letter at index i

console.log(o);
console.log(delAtIdx(s, 4));

_x000D_

User · Answer

Just fix your replaceAt   String prototype replaceAt   function index  charcount      return this substr 0  index    this substr index   charcount      mystring replaceAt 4  1     I d call it  removeAt instead

User · Answer

A simple functional javascript way would be   mystring   mystring split   r   join       simple  fast  it replace globally and no need for functions or prototypes

User · Answer

If you just want to remove single character and If you know index of a character you want to remove  you can use following function          Remove single character at particular index from string     param     index index of character you want to remove     param     str string from which character should be removed     function removeCharAtIndex index  str        var maxIndex index  0 0 index      return str substring 0  maxIndex    str substring index  str length

User · Answer

You can use this  if   str 4       r    str   str slice 0  4    str slice 5   Explanation    if   str 4       r    Check if the 5th character is a  r  str slice 0  4  Slice the string to get everything before the  r    str slice 5  Add the rest of the string    Minified  s s 4    r  s slice 0 4  s slice 5  s  37 bytes    DEMO    x000D   x000D  function remove5thR  s    x000D    s s 4    r  s slice 0 4  s slice 5  s  x000D    console log s      log output x000D    x000D   x000D  remove5thR  crt r2002 2        gt   crt 2002 2  x000D  remove5thR  crt r2002 2        gt   crt 2002 2  x000D  remove5thR  rrrrr              gt   rrrr  x000D  remove5thR  RRRRR              gt   RRRRR   no change  x000D   x000D   x000D

User · Answer

x000D   x000D  let str    1234567   let index   3  str   str substring 0  index    str substring index   1   console log str     123567 - number  4  under index  3  is removed x000D   x000D   x000D

User · Answer

It only works if I replace it with another character  It will not simply remove it    This is because when char is equal to     char length is 0  so your substrings combine to form the original string  Going with your code attempt  the following will work   String prototype replaceAt   function  index  char        return this substr 0  index    char   this substr index   1            this will  replace  the character at index with char        DEMO

User · Answer

The shortest way would be to use splice  var inputString    abc      convert to array and remove 1 element at position 4 and save directly to the array itself let result   inputString split     splice 3  1  join    console log result

User · Answer

Your first func is almost right  Just remove the  g  flag which stands for  global   edit  and give it some context to spot the second  r    Edit  didn t see it was the second  r  before so added the      Needs    to escape the     when using a regEx arg  Thanks for the upvotes but I was wrong so I ll fix and add more detail for people interested in understanding the basics of regEx better but this would work   mystring replace    r          Now for the excessive explanation   When reading writing a regEx pattern think in terms of   lt a character or set of charcters gt  followed by  lt a character or set of charcters gt  followed by  lt      In regEx  lt a character or set of charcters gt  could be one at a time    each char in this pattern    So read as e  followed by a  followed by c  etc     Or a single  lt a character or set of charcters gt  could be characters described by a character class     123 y     any one of these    123 y     anything but one of the chars following      very useful performance enhancing btw    Or expanded on to match a quantity of characters  but still best to think of as a single element in terms of the sequential pattern     a 2     precisely two  a  chars - matches identically as  aa  would    aA  1 3     1-3 matches of  a  or  A     a-zA-Z      one or more matches of any letter in the alphabet upper and lower    -  denotes a sequence in a character class    0-9      0 to any number of matches of any decimal character    d   would also work    So smoosh a bunch together      var rePattern     aA  4 8  Eat at Joes Joes all you can eat  0-5   g    var joesStr    aaaAAAaaEat at Joes123454321 or maybe aAaAJoes all you can   eat098765       joesStr match rePattern         returns   aaaAAAaaEat at Joes123454321    aAaAJoes all you can eat0        without the  g  after the closing     it would just stop at the first   match and return         aaaAAAaaEat at Joes123454321     And of course I ve over-elaborated but my  point was simply that this    cat    is a series of 3 pattern elements  a thing followed by a thing followed by a thing    And so is this     aA  4 8  Eat at Joes Joes all you can eat  0-5      As wacky as regEx starts to look  it all breaks down to series of things  potentially multi-character things  following each other sequentially  Kind of a basic point but one that took me a while to get past so I ve gone overboard explaining it here as I think it s one that would help the OP and others new to regEx understand what s going on  The key to reading writing regEx is breaking it down into those pieces

User · Answer

In C   Sharp   you can make an empty character as   0   Maybe you can do this   String prototype replaceAt   function  index  char    return this substr 0  index    char   this substr index   char length     mystring replaceAt 4    0     Search on google or surf on the interent and check if javascript allows you to make empty characters  like C  does  If yes  then learn how to do it  and maybe the replaceAt function will work at last  and you ll achieve what you want   Finally that  r  character will be removed

User · Answer

Create function like below     String prototype replaceAt   function  index  char          if char                  return this slice 0 index  this substr index 1   char length           else             return this substr 0  index    char   this substr index   char length                 To replace give character like below    var a  12346     a replaceAt 4  5        and to remove character at definite index  give second parameter as empty string  a replaceAt 4

User · Answer

For global replacement of   r   this code worked for me   mystring   mystring replace    r g

User · Answer

There s always the string functions  if you know you re always going to remove the fourth character   str slice 0  4    str slice 5  str length

User · Answer

return this substr 0  index    char   this substr index   char length     char length is zero  You need to add 1 in this case in order to skip character

User · Answer

I dislike using replace function to remove characters from string  This is not logical to do it like that  Usually I program in C   Sharp   and whenever I want to remove characters from string  I use the Remove method of the String class  but no Replace method  even though it exists  because when I am about to remove  I remove  no replace  This is logical   In Javascript  there is no remove function for string  but there is substr function  You can use the substr function once or twice to remove characters from string  You can make the following function to remove characters at start index to the end of string  just like the c  method first overload String Remove int startIndex    function Remove str  startIndex        return str substr 0  startIndex       and or you also can make the following function to remove characters at start index and count  just like the c  method second overload String Remove int startIndex  int count    function Remove str  startIndex  count        return str substr 0  startIndex    str substr startIndex   count       and then you can use these two functions or one of them for your needs   Example   alert Remove  crt r2002 2   4  1      Output  crt 2002 2  Achieving goals by doing techniques with no logic might cause confusions in understanding of the code  and future mistakes  if you do this a lot in a large project

User · Answer

var mystring    crt r2002 2   mystring   mystring replace   r          will replace  r with   using String prototype replace   Alternatively you could use regex with a global flag  as suggested by Erik Reppen  amp  Sagar Gala  below  to replace all occurrences with  mystring   mystring replace    r g          EDIT  Since everyone s having so much fun here and user1293504 doesn t seem to be coming back any time soon to answer clarifying questions  here s a method to remove the Nth character from a string   String prototype removeCharAt   function  i        var tmp   this split         convert to an array     tmp splice i - 1   1      remove 1 element from the array  adjusting for non-zero-indexed counts      return tmp join         reconstruct the string    console log  crt r2002 2  removeCharAt 4      Since user1293504 used the normal count instead of a zero-indexed count  we ve got to remove 1 from the index  if you wish to use this to replicate how charAt works do not subtract 1 from the index on the 3rd line and use tmp splice i  1  instead

User · Answer

If it is always the 4th char in yourString you can try       yourString replace      4   r    function  1   2    return  2

User · Answer

The following function worked best for my case   public static cut value  string  cutStart  number  cutEnd  number   string       return value substring 0  cutStart    value substring cutEnd   1  value length

[javascript] How can I remove a character from a string using JavaScript?

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