Does TiddlyWiki have any reserved words?

#1

In some programming languages, there are typically reserved words, such as let, that cannot be used as variable names. So, does TiddlyWiki have similar restrictions on reserved words? And will such restrictions be added in future versions? Because I plan to create some entries with titles containing @ or #, such as @apple or #apple. I am unsure if this will be affected, especially considering compatibility with versions after 5.4.0.

#2

There are some restrictions for tiddler titles. Eg: | [ ] { } – If you use them in the tiddler editor, you will get a message. – Those characters can cause problems with filters.

The other reserved prefix is $:/ for system tiddlers

@ and # should not cause any problems.

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#3

Tiddlywiki is very permissive when it comes to variable names and there partners macros, procedures etc…

  • Keep in mind it is more about how you reference the element such as using <<varname>> and <varname> inside filters.

One idea is to set up a simple test;

<<varname>>

<$let varname="var value">

here=<<#varname>>

</$let>

This allows you to quickly test which var names are valid.

  • The first line is to check if it already has a value.

If you or the system already defined that variable yes you may arguably want to avoid that name as setting an existing variable name effectivly sets a new local value.

  • Tiddlywiki uses a prefix tv-varname for a set of system variables (tv=tiddlywiki variable)
  • Similarly you could do the same

Because you can set the value of a variable localy it is often possible to reuse a variable name even if its already in use, as long as you are not trying to access its earlier value, when the var/set/let or tiddler ends it will fall back to its previouse value.

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