am I correct in my thinking that I can consider a tiddler like an object in an OO database having data stored in fields and functions stored as macros in the text field?
In my case, if I had a tiddler, say $:/tls/unique-id with a field unique_id having a value of 1. I could then write a macro in that tiddler, say increment_unique_id, to increment the field by 1 and use a $list filter to retrieve the new number from any other tiddler that needs the unique value. To increment, all I need to do is call the macro that increments the number in the tiddler $:/tls/unique-id. Am I on the wrong track here? bobj On Thursday, 10 September 2020 at 16:00:18 UTC+10 Bob Jansen wrote: > Tones, > > Thanks for your reply. I am not averse to learning about filters in fact > as I go along I'm getting much better at them. > > I was just frustrated at the poor documentation of how to do simple > concatenation or arithmetic. The examples assume a higher level of > familiarity with the subject than I currently possess. The issue for me is > how to relate my problem to a filter based solution. > > Hopefully your reply as with others will give me greater insight. > > Bobj > > --------------- > > Dr Bob Jansen > > The Cultural Conversations project > > Turtle Lane Studios Pty Ltd trading as the Australian Centre for Oral History > > 122 Cameron St, Rockdale NSW 2216, Australia > > Ph (Korea): +82 10-4494-0328 <+82%2010-4494-0328> > > Ph (Australia) +61 414 297 448 <+61%20414%20297%20448> > > Resume: http://au.linkedin.com/in/bobjan > > Skype: bobjtls > > KakaoTalk: bobjtls > > http://www.cultconv.com > > > In line with the Australian anti-spam legislation, if you wish to receive no > further email from me, please send me an email with the subject "No Spam" > > > On 10 Sep 2020, at 12:19, TW Tones <anthony...@gmail.com> wrote: > > Bob, > > 1. Is there a simple concatenation operator, like & or + that can be used >> to concatenate strings? I know that a macro can do it but that seems very >> confusing to a simple mind like me. > > > 1. Concatenation > > There are many ways to concatenate with tiddlywiki, although for good > reasons in may seem not as strait forward as you would expect. In part > because where do you want this concatenated result used? > Please provide a descriptive example of what you are currently try to > achieve. > > With concatenation you will find these methods useful > > - Define a macro in which the concatenation occurs > - You can use $(currentTiddler)$ and parameter $param$ for simple > substitutions > - Wiki fy that macro (with the same name is ok) just before you use it > say in a filter and some parameters > - You can use add-prefix/split/join/splitregext and other string > handling. > > 2. Is there a way of doing simple arithmetic, say increment a variable or >> add some variables together? The manual implies that it is possible in a >> filter but I want to do it outside of a filter. > > > 2. Most if not all the mathematics functions in standard tiddlywiki are > "filter operators", so they must be used in filters > > However; > > - Use triple braces to present the result of a calculation in line as > a parameter. > {{{ [your maths filter] }}} but you may need to turn the result into > text <$text text={{{ [your maths filter] }}}/> > - You can use other maths plugins like Evans formula plugin he uses > Mushroom brackets (= maths =), calc widget and others > > In closing if you are reluctant to learn filters in more detail, I suggest > you jump in. Filters are so powerful once you come to understand them your > powers are almost unlimited. > > Regards > TW Tones > > On Thursday, 10 September 2020 11:13:06 UTC+10, Bob Jansen wrote: >> >> >> >> >> >> bobj >> >> -- > You received this message because you are subscribed to a topic in the > Google Groups "TiddlyWiki" group. > To unsubscribe from this topic, visit > https://groups.google.com/d/topic/tiddlywiki/WFwExRhO05c/unsubscribe. > To unsubscribe from this group and all its topics, send an email to > tiddlywiki+...@googlegroups.com. > To view this discussion on the web visit > https://groups.google.com/d/msgid/tiddlywiki/7ff64fd3-d473-4ecb-b463-818671f80e51o%40googlegroups.com > > <https://groups.google.com/d/msgid/tiddlywiki/7ff64fd3-d473-4ecb-b463-818671f80e51o%40googlegroups.com?utm_medium=email&utm_source=footer> > . > > -- You received this message because you are subscribed to the Google Groups "TiddlyWiki" group. To unsubscribe from this group and stop receiving emails from it, send an email to tiddlywiki+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/tiddlywiki/529c4edb-226e-4e9d-8f0c-19a89f07da60n%40googlegroups.com.
