Delete first character of a string in Javascript

Question

I want to delete the first character of a string  if the first character is a 0   The 0 can be there more than once   Is there a simple function that checks the first character and deletes it if it is 0   Right now  I m trying it with the JS slice   function but it is very awkward

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Here s one that doesn t assume the input is a string  uses substring  and comes with a couple of unit tests   var cutOutZero   function value        if  value length  amp  amp  value length  gt  0  amp  amp  value 0       0             return value substring 1              return value       http   jsfiddle net TRU66 1

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You can do it with substring method   let a    My test string    a   a substring 1    console log a      y test string

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var s    0test   if s substr 0 1      0         s   s substr 1       For all 0s  http   jsfiddle net An4MY   String prototype ltrim0   function      return this replace    0           var s    0000test  ltrim0

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From the Javascript implementation of trim     that removes and leading or ending spaces from strings  Here is an altered implementation of the answer for this question   var str    0000one two three0000     TEST   str   str replace    s   s   g  0      ANSWER   Original implementation for this on JS   string trim    if   String prototype trim     String prototype trim   function       return this replace    s   s   g

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Very readable code is to use  substring   with a start set to index of the second character  1   first character has index 0   Second parameter of the  substring   method is actually optional  so  you don t even need to call  length      TL DR   Remove first character from the string  str   str substring 1       yes it is that simple    Removing some particular character s   As  Shaded suggested  just loop this while first character of your string is the  quot unwanted quot  character    var yourString    quot 0000test quot   var unwantedCharacter    quot 0 quot     there is really no need for     check  since we use String s charAt   while  yourString charAt 0     unwantedCharacter   yourString   yourString substring 1     yourString now contains  quot test quot    slice   vs  substring   vs  substr   EDIT  substr   is not standardized and should not be used for new JS codes  you may be inclined to use it because of the naming similarity with other languages  e g  PHP  but even in PHP you should probably use mb substr   to be safe in modern world    Quote from  and more on that in  What is the difference between String slice and String substring   He also points out that if the parameters to slice are negative  they reference the string from the end  Substring and substr doesn  t

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var test    0test   test   test replace  0         1

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Did you try the substring function   string   string indexOf 0      0    string substring 1    string    Here s a reference - https   developer mozilla org en-US docs JavaScript Reference Global Objects String substring  And you can always do this for multiple 0s   while string indexOf 0      0         string   string substring 1

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Another alternative to get the first character after deleting it     Example string let string    Example       Getting the first character and updtated string  character  string     string 0   string substr 1     console log character       E   console log string       xample

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x000D   x000D  String prototype trimStartWhile   function predicate    x000D      if  typeof predicate      function     x000D       return this  x000D        x000D      let len   this length  x000D      if  len     0    x000D          return this  x000D        x000D      let s   this  i   0  x000D      while  i  lt  len  amp  amp  predicate s i      x000D       i    x000D        x000D      return s substr i  x000D    x000D   x000D  let str    0000000000ABC   x000D      r   str trimStartWhile c   gt  c      0    x000D       x000D  console log r   x000D   x000D   x000D

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The easiest way to strip all leading 0s is   var s    00test   s   s replace   0           If just stripping a single leading 0 character  as the question implies  you could use  s   s replace   0

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---- remove first and last char of str     str   str substring 1   keyw length -1       ---- remove only first char     str   str substring 1  keyw length       ---- remove only last char     str   str substring 0  keyw length

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You can remove the first character of a string using substring  var s1    quot foobar quot   var s2   s1 substring 1   alert s2      shows  quot oobar quot   To remove all 0 s at the start of the string  var s    quot 0000test quot   while s charAt 0       0      s   s substring 1

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Use  charAt   and  slice    Example  http   jsfiddle net kCpNQ  var myString    quot 0String quot    if  myString charAt  0        0        myString   myString slice  1     If there could be several 0 characters at the beginning  you can change the if   to a while    Example  http   jsfiddle net kCpNQ 1  var myString    quot 0000String quot    while  myString charAt  0        0        myString   myString slice  1

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try  s replace   0         x000D   x000D  console log  0string    gt     0string  replace   0         x000D  console log  00string   gt     00string  replace   0         x000D  console log  string00   gt     string00  replace   0         x000D   x000D   x000D

[javascript] Delete first character of a string in Javascript

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