Equivalent of String format in jQuery

Question

I m trying to move some JavaScript code from MicrosoftAjax to JQuery  I use the JavaScript equivalents in MicrosoftAjax of the popular  net methods  e g  String format    String startsWith    etc  Are there equivalents to them in jQuery

User · Accepted Answer

The source code for ASP NET AJAX is available for your reference  so you can pick through it and include the parts you want to continue using into a separate JS file   Or  you can port them to jQuery   Here is the format function     String format   function       var s   arguments 0     for  var i   0  i  lt  arguments length - 1  i                 var reg   new RegExp         i           gm                     s   s replace reg  arguments i   1           return s      And here are the endsWith and startsWith prototype functions     String prototype endsWith   function  suffix      return  this substr this length - suffix length      suffix      String prototype startsWith   function prefix      return  this substr 0  prefix length      prefix

User · Answer

This is a faster simpler  and prototypical  variation of the function that Josh posted   String prototype format   String prototype f   function         var s   this          i   arguments length       while  i--            s   s replace new RegExp         i           gm    arguments i              return s       Usage    Added  0  by  1  to your collection  f title  artist   Your balance is  0  USD  f 77 7     I use this so much that I aliased it to just f  but you can also use the more verbose format  e g   Hello  0    format name

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Expanding on adamJLev s great answer above  here is the TypeScript version      Extending String prototype interface String       format    params  any     string        Variable number of params  mimicking C  params keyword    params type is set to any so consumer can pass number    or string  might be a better way to constraint types to    string and number only using generic  String prototype format   function     params  any          var s   this          i   params length       while  i--            s   s replace new RegExp         i           gm    params i               return s

User · Answer

Here s mine   String format   function tokenised           var args   arguments          return tokenised replace    0-9   g  function matched               matched   matched replace       g                   return args parseInt matched  1                                    Not bullet proof but works if you use it sensibly

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lt html gt   lt body gt   lt script type  text javascript  gt     var str  http   xyz html ID  0  amp TId  1  amp STId  2  amp RId  3  14 480 3 38      document write FormatString str       function FormatString str          var args   str split             for  var i   0  i  lt  args length  i               var reg   new RegExp         i                                     args 0  args 0  replace reg  args  i 1                  return args 0         lt  script gt   lt  body gt   lt  html gt

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Made a format function that takes either a collection or an array as arguments  Usage    format  i can speak  language  since i was  age    language  javascript  age 10     format  i can speak  0  since i was  1    javascript  10      Code   var format   function  str  col        col   typeof col      object    col   Array prototype slice call arguments  1        return str replace                w     g  function  m  n            if  m            return                if  m            return                return col n

User · Answer

If you re using the validation plugin you can use   jQuery validator format   0   1     cool    formatting      cool formatting   http   docs jquery com Plugins Validation jQuery validator format templateargumentargumentN

User · Answer

I couldn t get Josh Stodola s answer to work  but the following worked for me  Note the specification of prototype   Tested on IE  FF  Chrome  and Safari     String prototype format   function         var s   this      if t length - 1    args length           alert  String format    Incorrect number of arguments              for  var i   0  i  lt  arguments length  i                     var reg   new RegExp         i           gm            s   s replace reg  arguments i              return s      s really should be a clone of this so as not to be a destructive method  but it s not really necessary

User · Answer

Now you can use Template Literals        x000D   x000D  var w    the Word   x000D  var num1   2  x000D  var num2   3  x000D   x000D  var long multiline string    This is very long x000D  multiline templete string  Putting somthing here  x000D    w  x000D  I can even use expresion interpolation  x000D  Two add three     num1   num2  x000D  or use Tagged template literals x000D  You need to enclose string with the back-tick           x000D   x000D  console log long multiline string   x000D   x000D   x000D

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Using a modern browser  which supports EcmaScript 2015  ES6   you can enjoy Template Strings  Instead of formatting  you can directly inject the variable value into it   var name    Waleed   var message    Hello   name       Note the template string has to be written using back-ticks

User · Answer

None of the answers presented so far has no obvious optimization of using enclosure to initialize once and store regular expressions  for subsequent usages      DBJ ORG string format function    usage      0  means  zero   format  nula       returns   nula means  zero      place holders must be in a range 0-99     if no argument given for the placeholder      no replacement will be done  so     oops  99   format         returns the input    same placeholders will be all replaced     with the same argument       oops  0  0   format             returns  oops        if   function     typeof    format      add format   if one does not exist already   String prototype format    function         var rx1        d  d d    g  rx2     d         return function             var args   arguments          return this replace rx1  function  0                var idx   1    0 match rx2  0               return args idx      undefined   args idx     args idx                 0                            alert   0   0    0     format   X        Also  none of the examples respects format   implementation if one already exists

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This violates DRY principle  but it s a concise solution   var button     lt a href   link   class  btn  gt  text  lt  a gt    button   button replace   text    Authorize on GitHub   replace   link    authorizeUrl

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The following answer is probably the most efficient but has the caveat of only being suitable for 1 to 1 mappings of arguments  This uses the fastest way of concatenating strings  similar to a stringbuilder  array of strings  joined   This is my own code  Probably needs a better separator though   String format   function str  args        var t   str split           var sb    t 0        for var i   0  i  lt  args length  i             sb push args i            sb push t i 1              return sb join          Use it like   alert String format   lt a href     gt   lt  a gt      one    two

User · Answer

There is an  somewhat  official option  jQuery validator format   Comes with jQuery Validation Plugin 1 6  at least   Quite similar to the String Format found in  NET   Edit Fixed broken link

User · Answer

You can also closure array with replacements like this    var url     getElement        replace    g       gt  this ar this i     bind  ar    invoice    id   1337  i  0     gt    getElement invoice id 1337   or you can try bind    getElement        replace    g   function     return this ar this i       bind  ar    invoice    id   1337  i  0

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Though not exactly what the Q was asking for  I ve built one that is similar but uses named placeholders instead of numbered  I personally prefer having named arguments and just send in an object as an argument to it  more verbose  but easier to maintain    String prototype format   function  args        var newStr   this      for  var key in args            newStr   newStr replace       key        args key              return newStr      Here s an example usage     alert  Hello  name   format   name   World

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I have a plunker that adds it to the string prototype  string format It is not just as short as some of the other examples  but a lot more flexible   Usage is similar to c  version   var str2    Meet you on  0   ask for  1    var result2   str2 format  Friday    Suzy       result  Meet you on Friday  ask for Suzy   NB  also accepts an array   Also  added support for using names  amp  object properties  var str1    Meet you on  day   ask for  Person    var result1   str1 format  day   Thursday   person   Frank        result  Meet you on Thursday  ask for Frank

User · Answer

Here s my version that is able to escape      and clean up those unassigned place holders   function getStringFormatPlaceHolderRegEx placeHolderIndex        return new RegExp             placeHolderIndex                gm      function cleanStringFormatResult txt        if  txt    null  return          return txt replace getStringFormatPlaceHolderRegEx    d             String prototype format   function          var txt   this toString        for  var i   0  i  lt  arguments length  i              var exp   getStringFormatPlaceHolderRegEx i           txt   txt replace exp   arguments i     null        arguments i               return cleanStringFormatResult txt     String format   function          var s   arguments 0       if  s    null  return          for  var i   0  i  lt  arguments length - 1  i              var reg   getStringFormatPlaceHolderRegEx i           s   s replace reg   arguments i   1     null        arguments i   1               return cleanStringFormatResult s

User · Answer

Many of the above functions  except Julian Jelfs s  contain the following error   js gt    0   0   1   2   format 3 14   a 2 bc    foo    3 14 3 14 afoobc foo   Or  for the variants that count backwards from the end of the argument list   js gt    0   0   1   2   format 3 14   a 0 bc    foo    3 14 3 14 a3 14bc foo   Here s a correct function  It s a prototypal variant of Julian Jelfs s code  which I made a bit tighter   String prototype format   function        var args   arguments    return this replace      d     g  function  m  n    return args n            And here is a slightly more advanced version of the same  which allows you to escape braces by doubling them   String prototype format   function        var args   arguments    return this replace                d     g  function  m  n        if  m            return            if  m            return            return args n              This works correctly   js gt    0    0      0     1   2   format 3 14   a 2 bc    foo    3 14  0   3 14  a 2 bc foo   Here is another good implementation by Blair Mitchelmore  with a bunch of nice extra features  https   web archive org web 20120315214858 http   blairmitchelmore com javascript string format

User · Answer

Way past the late season but I ve just been looking at the answers given and have my tuppence worth   Usage   var one   strFormat    0   is not  1     aalert    defined    var two   strFormat   0   0   1   2    3 14   a 2 bc    foo      Method   function strFormat         var args   Array prototype slice call arguments  1       return arguments 0  replace      d     g  function  match  index            return args index               Result    aalert  is not defined 3 14 3 14 a 2 bc foo

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