How to trim a string to N chars in Javascript

Question

How can I  using Javascript  make a function that will trim string passed as argument  to a specified length  also passed as argument  For example   var string    this is a string   var length   6  var trimmedString   trimFunction length  string       trimmedString should be      this is    Anyone got ideas  I ve heard something about using substring  but didn t quite understand

User · Answer

let trimString   function  string  length          return string length  gt  length                 string substring 0  length                         string           Use Case    let string    How to trim a string to N chars in Javascript    trimString string  20      How to trim a string

User · Answer

I suggest to use an extension for code neatness  Note that extending an internal object prototype could potentially mess with libraries that depend on them   String prototype trimEllip   function  length      return this length  gt  length   this substring 0  length            this      And use it like   var stringObject   this is a verrrryyyyyyyyyyyyyyyyyyyyyyyyyyyyylllooooooooooooonggggggggggggsssssssssssssttttttttttrrrrrrrrriiiiiiiiiiinnnnnnnnnnnnggggggggg   stringObject trimEllip 25

User · Answer

I think that you should use this code  -          sample string             const param   Hi you know anybody like pizaa                You can change limit parameter up to you           const checkTitle    str  limit   17    gt          var newTitle             if  param length  gt   limit            param split      reduce  acc  cur    gt              if  acc   cur length  lt   limit                newTitle push cur                         return acc   cur length             0           return    newTitle join                           return param             console log checkTitle str        result   Hi you know anybody

User · Answer

Just another suggestion  removing any trailing white-space limitStrLength    text  max length    gt        if text length  gt  max length - 3           return text substring 0  max length  trimEnd      quot     quot            else          return text

User · Answer

Little late    I had to respond  This is the simplest way    x000D   x000D     JavaScript x000D  function fixedSize JS value  size    x000D    return value padEnd size  substring 0  size   x000D    x000D   x000D     JavaScript  Alt  x000D  var fixedSize JSAlt   function value  size    x000D    return value padEnd size  substring 0  size   x000D    x000D   x000D     Prototype  preferred  x000D  String prototype fixedSize   function size    x000D    return this padEnd size  substring 0  size   x000D    x000D   x000D     Overloaded Prototype x000D  function fixedSize value  size    x000D    return value fixedSize size   x000D    x000D   x000D     usage x000D  console log  Old school JS - gt       fixedSize JS  test  30 characters    30          x000D  console log  Semi-Old school JS - gt       fixedSize JSAlt  test  10 characters    10          x000D  console log  Prototypes  Preferred  - gt        test  25 characters   fixedSize 25          x000D  console log  Overloaded Prototype  Legacy support  - gt       fixedSize  test  15 characters    15          x000D   x000D   x000D    Step by step    padEnd - Guarentees the length of the string    The padEnd   method pads the current string with a given string  repeated  if needed  so that the resulting string reaches a given length  The padding is applied from the end  right  of the current string  The source for this interactive example is stored in a GitHub repository   source  developer mozilla org en-US docs Web JavaScript Reference        substring - limits to the length you need  If you choose to add ellipses  append them to the output   I gave 4 examples of common JavaScript usages  I highly recommend using the String prototype with Overloading for legacy support  It makes it much easier to implement and change later

User · Answer

https   developer mozilla org en JavaScript Reference Global Objects String substr  From link   string substr start   length

User · Answer

Why not just use substring    string substring 0  7   The first argument  0  is the starting point  The second argument  7  is the ending point  exclusive   More info here   var string    this is a string   var length   7  var trimmedString   string substring 0  length

User · Answer

Copying Will s comment into an answer  because I found it useful   var string    this is a string   var length   20  var trimmedString   string length  gt  length                        string substring 0  length - 3                                 string    Thanks Will   And a jsfiddle for anyone who cares https   jsfiddle net t354gw7e

[javascript] How to trim a string to N chars in Javascript?

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