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Javascript StringBuilder for Beginners (ASP.NET 3.5 and above)

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18 Apr 2011CPOL 21.3K   5   2
Just a simple note with sys.StringBuilder which is just beginner level
Just a beginner tip. Many programmers still use string concatenations in the classical way. An example situation like this - Adding and deleting div dynamically in JavaScript[^]

Are JavaScript strings mutable? NO. So what is the best way to concatenate strings in JavaScript like runtime markup generation, etc? The .NET way is to use StringBuilder. From Framework 3.5, it is available through the Microsoft Ajax Library. Enable Ajax in the page by using a ScriptManager. Now the Sys.StringBuilder class is available for use.
<asp:ScriptManager ID="script1" runat ="server">

In Javascript:
var sb = new Sys.StringBuilder();
sb.append("Hello ");
sb.append("World ");

How does a string builder do concatenation efficiently? It uses an array to hold the strings, then uses the Array.Join to concatenate the strings. So intermediate string generations are avoided.


This article, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

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Software Developer
India India
I am developer in .Net and GIS.

Comments and Discussions

GeneralCross browser Pin
Steve Wellens16-Apr-11 4:58
Steve Wellens16-Apr-11 4:58 
Will this work on browsers based on Linux or Macintosh operating systems?

(I'm going to guess no).
Steve Wellens

GeneralRe: Cross browser Pin
Albin Abel16-Apr-11 5:10
Albin Abel16-Apr-11 5:10 

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