Re: [tw5] Re: [good practice] A multi steps IF using filters
Thank you @Mark. It seems the {{{filter...}}} has a lot of potential to
create conditional statements. The actual use case was based on the user
interaction a set of classes shall be applied to few html tags. I used the
dictionary tiddler, but for small use cases I like your approach.
@Tones, thank you. I like these kinds of threads where the scripting
features of TW are discussed and I always learn new things.
Thank you Jed, Mat, Mark, and Tones.
Best wishes
Mohammad
On Mon, Jan 25, 2021 at 4:00 AM 'Mark S.' via TiddlyWiki <
tiddlywiki@googlegroups.com> wrote:
> Maybe too literal, but easier to read and extend:
>
> \define myfun(x)
> <$vars u={{{ [enlist[xxx one two three four]allbefore<__x__>count[]] }}} >
> This is u: <>
>
> \end
>
>
>
> On Sunday, January 24, 2021 at 2:24:58 AM UTC-8 Mohammad wrote:
>
>> I tried to implement the below pseudo code in TW 5.1.23
>>
>> if x=one then
>> print(1)
>> elseif x=two then
>> print(2)
>> elseif x=three then
>> print(3)
>> else
>> print(x is not valid)
>> end
>>
>> with
>>
>> \define myfun(x)
>> <$vars u={{{[<__x__>match[one]then[1]] [<__x__>match[two]then[2]]
>> [<__x__>match[three]then[3]] +[addsuffix[ lili]] ~[<__x__>addsuffix[ is
>> not valid]]}}} >
>> This is u: <>
>>
>> \end
>>
>> It works fine on https://tiddlywiki.com/ by calling macro as below
>>
>> <>
>> <>
>> <>
>> <>
>>
>> I wish to know is this a good practice in TW 5.1.23? If not what better
>> solution do you propose?
>>
>>
>> Best wishes
>> Mohammad
>>
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> .
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Re: [tw5] Re: [good practice] A multi steps IF using filters
Mohammad,
I know your example is more a general example, but if we look at the
specific example translating a number to a number-word we have the
advantage that the input is an integer.
\define number-words() one two three four five six seven eight nine
<$list filter="[range[1,9]]">
<> {{{ [split[ ]nth]
}}}
But this could be extended further
You could also use the number as the index to a json or dictionary tiddler.
Regards'
Tones
On Monday, 25 January 2021 at 05:09:00 UTC+11 Mohammad wrote:
> Mat,
> Thank you! Well yes a dictionary tiddler can be used. I have used such a
> solution in my recent plugin Tamasha.
> I also implement the switch-case using your proposed solution. Really
> powerful.
>
> By the way, there are situations where the operands are not constant. I
> just tried to see how I can implement a multi step IF.
> But I was not sure if my solution follows a good programming style or not!
>
> Best wishes
> Mohammad
>
>
> On Sun, Jan 24, 2021 at 6:10 PM Mat wrote:
>
>> @Mohammad
>>
>> It is not the IF-THEN structure you're asking for but if the input and
>> output are predefined like that, then it'd be simpler to use a data tiddler
>> to just get the value i.e {{datatiddler##two}} ---> 2
>>
>> <:-)
>>
>> On Sunday, January 24, 2021 at 11:24:58 AM UTC+1 Mohammad wrote:
>>
>>> I tried to implement the below pseudo code in TW 5.1.23
>>>
>>> if x=one then
>>> print(1)
>>> elseif x=two then
>>> print(2)
>>> elseif x=three then
>>> print(3)
>>> else
>>> print(x is not valid)
>>> end
>>>
>>> with
>>>
>>> \define myfun(x)
>>> <$vars u={{{[<__x__>match[one]then[1]] [<__x__>match[two]then[2]]
>>> [<__x__>match[three]then[3]] +[addsuffix[ lili]] ~[<__x__>addsuffix[ is
>>> not valid]]}}} >
>>> This is u: <>
>>>
>>> \end
>>>
>>> It works fine on https://tiddlywiki.com/ by calling macro as below
>>>
>>> <>
>>> <>
>>> <>
>>> <>
>>>
>>> I wish to know is this a good practice in TW 5.1.23? If not what better
>>> solution do you propose?
>>>
>>>
>>> Best wishes
>>> Mohammad
>>>
>> --
>>
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>>
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>> https://groups.google.com/d/msgid/tiddlywiki/ff7f5cc9-a710-4894-949a-b5e83b2788ecn%40googlegroups.com
>>
>>
>> .
>>
>
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Re: [tw5] Re: [good practice] A multi steps IF using filters
Mat,
Thank you! Well yes a dictionary tiddler can be used. I have used such a
solution in my recent plugin Tamasha.
I also implement the switch-case using your proposed solution. Really
powerful.
By the way, there are situations where the operands are not constant. I
just tried to see how I can implement a multi step IF.
But I was not sure if my solution follows a good programming style or not!
Best wishes
Mohammad
On Sun, Jan 24, 2021 at 6:10 PM Mat wrote:
> @Mohammad
>
> It is not the IF-THEN structure you're asking for but if the input and
> output are predefined like that, then it'd be simpler to use a data tiddler
> to just get the value i.e {{datatiddler##two}} ---> 2
>
> <:-)
>
> On Sunday, January 24, 2021 at 11:24:58 AM UTC+1 Mohammad wrote:
>
>> I tried to implement the below pseudo code in TW 5.1.23
>>
>> if x=one then
>> print(1)
>> elseif x=two then
>> print(2)
>> elseif x=three then
>> print(3)
>> else
>> print(x is not valid)
>> end
>>
>> with
>>
>> \define myfun(x)
>> <$vars u={{{[<__x__>match[one]then[1]] [<__x__>match[two]then[2]]
>> [<__x__>match[three]then[3]] +[addsuffix[ lili]] ~[<__x__>addsuffix[ is
>> not valid]]}}} >
>> This is u: <>
>>
>> \end
>>
>> It works fine on https://tiddlywiki.com/ by calling macro as below
>>
>> <>
>> <>
>> <>
>> <>
>>
>> I wish to know is this a good practice in TW 5.1.23? If not what better
>> solution do you propose?
>>
>>
>> Best wishes
>> Mohammad
>>
> --
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>
> .
>
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Re: [tw5] Re: [good practice] A multi steps IF using filters
Thank you Jed,
I have not used the lookup operator, seems promising. I will give a try.
Best wishes
Mohammad
On Sun, Jan 24, 2021 at 2:41 PM Jed Carty wrote:
> I don't see anything wrong with using that macro, but I do have an
> alternative that I think is more flexible.
> Depending on the situation this may not work, but here is the same result
> using lookup:
>
> \define myfun(x)
> <$vars u={{{ [<__x__>lookup:$x$ doesn't exist[value ]] }}}
> \end
>
> then you make a series of tiddlers with the titles 'value one', 'value
> two', 'value three' with 1, 2 and 3 in their text fields.
>
> The downside is that you can't distribute it as just the macro, the
> benefit is that you can extend it to as many options as you want without
> editing the macro.
>
> On Sunday, January 24, 2021 at 11:34:00 AM UTC+1 Mat wrote:
>
>> Very minor but for readability you can break the line in multiple places.
>>
>> <:-)
>>
>> On Sunday, January 24, 2021 at 11:24:58 AM UTC+1 Mohammad wrote:
>>
>>> I tried to implement the below pseudo code in TW 5.1.23
>>>
>>> if x=one then
>>> print(1)
>>> elseif x=two then
>>> print(2)
>>> elseif x=three then
>>> print(3)
>>> else
>>> print(x is not valid)
>>> end
>>>
>>> with
>>>
>>> \define myfun(x)
>>> <$vars u={{{[<__x__>match[one]then[1]] [<__x__>match[two]then[2]]
>>> [<__x__>match[three]then[3]] +[addsuffix[ lili]] ~[<__x__>addsuffix[ is
>>> not valid]]}}} >
>>> This is u: <>
>>>
>>> \end
>>>
>>> It works fine on https://tiddlywiki.com/ by calling macro as below
>>>
>>> <>
>>> <>
>>> <>
>>> <>
>>>
>>> I wish to know is this a good practice in TW 5.1.23? If not what better
>>> solution do you propose?
>>>
>>>
>>> Best wishes
>>> Mohammad
>>>
>> --
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>
> .
>
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