*Formula 0.2.0 released*: https://evanbalster.com/tiddlywiki/formulas.html
GitHub and issue tracking: https://github.com/EvanBalster/TiddlyWikiFormula
This one's a doozie... Changelog:
A substantial re-write of the formulas plugin that introduces various
improvements and improves support for functional programming. Various minor
compatibility-breaking changes were made.
- Introduced (lambda) functions and formula-local variables.
- Added let construct <http://localhost:8080/#LetConstruct> for
making local variables.
- Added function declaration <http://localhost:8080/#Function>.
Closures are not supported yet.
- Added map function <http://localhost:8080/#Functions> for manipulating
array elements.
- Improved number formatting.
- Default number formatting no longer displays tiny imprecisions.
- Number formats may be specified with numeral.js
<http://numeraljs.com/>, enabling thousands separators, k/m/b
notation and greater control over digits.
- *Renamed some FormulaWidget
<http://localhost:8080/#FormulaWidget> and FormulaVarsWidget
<http://localhost:8080/#FormulaVarsWidget> attributes.*
- Original number formatting can still be used by specifying precision
(no
value).
- Enhanced support for imported values.
- Added Functions <http://localhost:8080/#Functions> for importing
values as text: transclude, transclude_index, variable
- Added datum function for interpreting text as a Datum
<http://localhost:8080/#Datum>.
- *Datum parsing now recognizes qualifying 14- and 17-digit numbers
as TiddlyWiki dates.* (eg. created & modified fields).
- *Widgets now display errors in the TiddlyWiki style*, like this.
- $formula-vars will display any errors instead of its normal content.
- $formula uses tc-error styling.
- *Value conversion behaviors have changed.*
- Non-array values will not be treated as single-element arrays.
- Enhanced array functions sum, average, product and count.
- Multi-dimensional array values are properly supported.
- *count ignores empty values.*
- New function counta counts empty values.
- Internal implementation was changed. *This will break customizations.*
- Consolidated "Node" type replaces Operator, Operand and Value.
- Removed Value "boxing" and percentage values.
- Implemented a new type cast mechanism, making custom JavaScript
functions simpler to write.
- Computation now uses a "context" object.
- Fixed doc error: $noRebuild option is not called $noRefresh
- The substitute and trim functions now process all occurrences, not
just one.
- Fixed implementation of the modulo function.
- *The % operator no longer affects display style.*
- Use a format string instread.
- *+, -, add and subtract no longer auto-sum their operands.*
- Use sum instead.
General remarks: This makes formula a lot more powerful, especially for
iterating through arrays with the MAP function. I might investigate even
more flexible ways to use that later. The absence of proper closures does
make functions and locals less useful as they could be, as local variables
can't currently be used inside the function supplied to MAP.
For a simple example of a computation that wasn't possible before, see the
Line Graph demo: http://localhost:8080/#Demo%3A%20Line%20Graph
On Saturday, 13 January 2018 15:25:29 UTC-6, coda coder wrote:
>
> Ah, the joys of IEEE-754...
>
> <$if "anyone wants to see the gory details of fp in javascript (and a slew
> of other languages all of which are dependent on today's CPUs)">
> https://www.h-schmidt.net/FloatConverter/
> </$if>
>
> :)
>
> On Saturday, January 13, 2018 at 2:09:28 PM UTC-6, Evan Balster wrote:
>>
>> Hey, all —
>>
>> I get 5.6000000000000005 as a result (instead of 5.6).
>>>
>>
>> Right now formula uses the JavaScript style for displaying numbers by
>> default, and it's pretty terrible. The inaccuracy is "floating point"
>> error and any reasonable system would round it off somehow. To get rid of
>> it, refer to the "fixed" and "precision" options in FormulaWidget:
>> http://evanbalster.com/tiddlywiki/formulas.html#FormulaWidget
>>
>> I'm probably going to change how numbers are formatted, likely using
>> numeral.js <http://numeraljs.com/> or something like it. This is one of
>> a few compatibility-breaking changes I'm thinking about for the big update.
>>
>>
>> On Saturday, 13 January 2018 13:28:30 UTC-6, ste...@gmail.com wrote:
>>>
>>> Hi Evan,
>>>
>>> I just ran into a weird problem. When I enter
>>>
>>> (= sum(1.5,1.2,2,0.9) =)
>>>
>>> (= 2+1.2+0.9+1.5 =)
>>>
>>> I get 5.6000000000000005 as a result (instead of 5.6). If I change the
>>> numbers slightly, I get the correct result.
>>>
>>> Is this a bug, or is there a well known explanation I'm not aware of?
>>>
>>> Kind regards,
>>>
>>> Stef
>>>
>>
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