Does JavaScript have a built in stringbuilder class

Question

I see a few code project solutions   But is there a regular implementation in JavaScript

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The ECMAScript nbsp 6 version  aka ECMAScript nbsp 2015  of JavaScript introduced string literals   var classType    stringbuilder   var q    Does JavaScript have a built-in   classType  class      Notice that back-ticks  instead of single quotes  enclose the string

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How about sys StringBuilder   try the following article   https   msdn microsoft com en-us library bb310852 aspx

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In C  you can do something like   String Format  hello  0   your age is  1       John    29     In JavaScript you could do something like    var x    hello  0   your age is  1     x   x replace    0   g   John     x   x replace    1   g  29

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That code looks like the route you want to take with a few changes   You ll want to change the append method to look like this  I ve changed it to accept the number 0  and to make it return this so you can chain your appends   StringBuilder prototype append   function  value        if  value    value     0            this strings push value             return this

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If you have to write code for Internet Explorer make sure you chose an implementation  which uses array joins  Concatenating strings with the   or    operator are extremely slow on IE  This is especially true for IE6  On modern browsers    is  usually just as fast as array joins   When I have to do lots of string concatenations I usually fill an array and don t use a string builder class   var html       html push      lt html gt        lt body gt       bla bla bla       lt  body gt        lt  html gt      return html join        Note that the push methods accepts multiple arguments

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I have defined this function   function format             var args   arguments          if  args length  lt   1                 return args                    var result   args 0           for  var i   1  i  lt  args length  i                  result   result replace new RegExp          i - 1            g    args i                      return result          And can be called like c     var text   format  hello  0   your age is  1       John    29     Result       hello John  your age is 29

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No  there is no built-in support for building strings  You have to use concatenation instead  You can  of course  make an array of different parts of your string and then call join   on that array  but it then depends on how the join is implemented in the JavaScript interpreter you are using  I made an experiment to compare the speed of str1 str2 method versus array push str1  str2  join   method  The code was simple  var iIterations  800000  var d1    new Date    valueOf    str1    quot  quot   for  var i   0  i lt iIterations  i        str1   str1   Math random   toString    var d2    new Date    valueOf    log  quot Time  strings    quot     d2-d1     var d3    new Date    valueOf    arr1       for  var i   0  i lt iIterations  i        arr1 push Math random   toString     var str2   arr1 join  quot  quot    var d4    new Date    valueOf    log  quot Time  arrays    quot     d4-d3     I tested it in Internet  Explorer  8 and Firefox 3 5 5  both on a Windows 7 x64  In the beginning I tested on small number of iterations  some hundred  some thousand items   The results were unpredictable  sometimes string concatenation took 0 milliseconds  sometimes it took 16 milliseconds  the same for array joining   When I increased the count to 50 000  the results were different in different browsers - in Internet  Explorer the string concatenation was faster  94 milliseconds  and join was slower 125 milliseconds   while in Firefox the array join was faster  113 milliseconds  than string joining  117 milliseconds   Then I increased the count to 500 000  Now the array join   was slower than string concatenation in both browsers  string concatenation was 937 ms in Internet  Explorer  1155 ms in Firefox  array join 1265 in Internet  Explorer  and 1207 ms in Firefox  The maximum iteration count I could test in Internet  Explorer without having  quot the script is taking too long to execute quot  was 850 000  Then Internet  Explorer was 1593 for string concatenation and 2046 for array join  and Firefox had 2101 for string concatenation and 2249 for array join  Results - if the number of iterations is small  you can try to use array join    as it might be faster in Firefox  When the number increases  the string1 string2 method is faster  UPDATE I performed the test on Internet  Explorer  6  Windows  XP   The process stopped to respond immediately and never ended  if I tried the test on more than 100 000 iterations  On 40 000 iterations the results were Time  strings   59175 ms Time  arrays   220 ms  This means - if you need to support Internet  Explorer  6  choose array join   which is way faster than string concatenation

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I just rechecked the performance on http   jsperf com javascript-concat-vs-join 2  The test-cases concatenate or join the alphabet 1 000 times   In current browsers  FF  Opera  IE11  Chrome    concat  is about 4-10 times faster than  join    In IE8  both return about equal results   In IE7   join  is about 100 times faster unfortunately

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For those interested  here s an alternative to invoking Array join   var arrayOfStrings     foo    bar    var result   String concat apply null  arrayOfStrings   console log result     The output  as expected  is the string  foobar   In Firefox  this approach outperforms Array join but is outperformed by   concatenation  Since String concat requires each segment to be specified as a separate argument  the caller is limited by any argument count limit imposed by the executing JavaScript engine  Take a look at the documentation of Function prototype apply   for more information

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When I find myself doing a lot of string concatenation in JavaScript  I start looking for templating  Handlebars js works quite well keeping the HTML and JavaScript more readable  http   handlebarsjs com

[javascript] Does JavaScript have a built in stringbuilder class?

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