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## 6. Scripting Language: pros and cons

To understand the importance and the future of Tcl/Tk I strongly suggest to point your web browser at the URL www.scriptics .com/people/john.ousterhout/ by John K. Ousterhout . You will read about the importance and the comparison between scripting (in langua ges such as Tcl) and system programming (in languages such as C and Java).

To read a document about comparisons see the comparison discussion.

Here's a summary of the most important pros and cons about Tcl/Tk.

## 6.1 Some of the most common complaints about Tcl

### Tcl is interpreted

The data is primarily treated as strings, programs written in Tcl are slow. Tcl 8.x attempts to address this by doing some degree of compilation as well as permitting additional variable types.

### Several characteristics are not intuitive

Comments are commands rather than traditional comments, numbers beginning with 0 are octal, proper use of quoting mechanisms, etc. These aspects are covered in the various FAQs.

## 6.2 Some of the most pros about Tcl

### It is a high-level scripting language

You need to write a lot less code to get your job done, especially when compared to Motif or Win32 applications. In general, the number of Line Of Code (LOC) of a software project is one of the most important complexity index es.

### Tcl is free

You can get the sources for free over the Internet from Scriptics Download Page or from the FTP site for Tcl. The software c ore site includes the source code version, as well as binary versions for Windows and Macintosh platforms; or, you can get Tcl on a number of CD-ROMs for a nominal cost.

Read about Tcl and Tk core free at www.scriptics.com/about/n ews/qa.html .

### It runs on many platforms

Versions exist for UNIX (Linux... of course), Windows and Macintosh. Except for a few platform differences, your Tcl scripts will run the same way on all systems.

### It is interpreted

You can execute your code directly, without compiling and linking (though Tcl compilers are available).

### It is extensible

It's easy to add your own commands to extend the Tcl language. You can write your commands in C or Tcl.

### It is embeddable in your applications

The Tcl interpreter is merely a set of C functions that you can call from your code. This means you can use Tcl as an application language, much like a macro language for a spreadsheet application.

### Tcl/Tk is Year 2000 (Y2K) compliant

Read what the creator of the Tcl and Tk core tells about this topic www.scriptics.com/Y2K.html .

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