Thanks Mark! Yes, in TW actually this is useful when one displays a random tiddler content for example at startup! I have post a question in separate post on this.
--Mohammad On Tuesday, September 10, 2019 at 11:01:58 PM UTC+4:30, Mark S. wrote: > > That's all based on Tobias' random filter. Looking at the code, it appears > nearly identical Devin's. I suppose there's only so many > ways to wrap that functionality. > > I guess one slight improvement would be to pass in context that would > prevent the number from changing every time the tiddler was refreshed. > Perhaps use the suffix (as if a field) to indicate "this usage here.". So > it would be locked in until the browser reloaded. > > Note that all random implementations are pseudo random. Supposedly > browsers now have an api, window.crypto.getRandomValues, that > produces better random values. I don't know how they can do that -- it's > like pulling a rabbit out of thin air. The randomness thing only > matters if you're doing things like encrypting critical data, pulling > numbers for a lottery or doing a research study. > > > > On Tuesday, September 10, 2019 at 10:53:58 AM UTC-7, @TiddlyTweeter wrote: >> >> See >> https://groups.google.com/forum/#!searchin/tiddlywiki/random$20numbers$20josiah%7Csort:date/tiddlywiki/N263pebgCYI/bWkecUA7AwAJ >> >> On Tuesday, 10 September 2019 19:41:37 UTC+2, Mohammad wrote: >>> >>> Hi TT >>> Is there any filter or math operator to do this? >>> >>> >>> Best wishes >>> Mohammad >>> >>> >>> On Tue, Sep 10, 2019 at 9:51 PM @TiddlyTweeter <tiddly...@assays.tv> >>> wrote: >>> >>>> One query. DO we need JavaScript for that? >>>> >>>> I thought it was doable in TW already? >>>> >>>> TT >>>> >>>> On Tuesday, 10 September 2019 19:11:51 UTC+2, Mohammad wrote: >>>>> >>>>> One question, >>>>> How about the performance effects? It seems when a tiddler uses this >>>>> filter every change on the screen trigger the simple filter! >>>>> >>>>> >>>>> Best wishes >>>>> Mohammad >>>>> >>>>> >>>>> On Tue, Sep 10, 2019 at 12:35 AM Devin Weaver <weave...@gmail.com> >>>>> wrote: >>>>> >>>>>> For anyone curious here is a neat filter option to grab a random >>>>>> tiddler from a list: >>>>>> >>>>>> <$list filter="[tag[quote]sample[3]]"> >>>>>> <$transclude/> >>>>>> </$list> >>>>>> >>>>>> will show you three random tiddlers with the quote tag. >>>>>> >>>>>> /*\ >>>>>> title: $:/filters/sample.js >>>>>> type: application/javascript >>>>>> module-type: filteroperator >>>>>> >>>>>> Filter to return random set from the current list. >>>>>> >>>>>> \*/ >>>>>> (function(){ >>>>>> >>>>>> /*jslint node: true, browser: true */ >>>>>> /*global $tw: false */ >>>>>> "use strict"; >>>>>> >>>>>> /* >>>>>> Export our filter function >>>>>> */ >>>>>> exports.sample = function(source,operator,options) { >>>>>> var sampleIndex; >>>>>> var allTitles = []; >>>>>> var samples = []; >>>>>> var numberOfSamples = parseInt(operator.operand) || 1; >>>>>> source(function(tiddler,title) { allTitles.push(title); }); >>>>>> if (numberOfSamples >= allTitles.length) { return allTitles; } >>>>>> for (var i = 0; i < numberOfSamples; i++) { >>>>>> sampleIndex = Math.floor(Math.random() * allTitles.length); >>>>>> samples = samples.concat(allTitles.splice(sampleIndex, 1)); >>>>>> } >>>>>> return samples; >>>>>> }; >>>>>> >>>>>> })(); >>>>>> >>>>>> >>>>>> -- >>>>>> 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 tiddl...@googlegroups.com. >>>>>> To view this discussion on the web visit >>>>>> https://groups.google.com/d/msgid/tiddlywiki/7ad1fb46-382e-417c-a5a4-6e412274a2e8%40googlegroups.com >>>>>> >>>>>> <https://groups.google.com/d/msgid/tiddlywiki/7ad1fb46-382e-417c-a5a4-6e412274a2e8%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 tiddl...@googlegroups.com. >>>> To view this discussion on the web visit >>>> https://groups.google.com/d/msgid/tiddlywiki/21677588-663c-40ad-8292-745c5a2f0b18%40googlegroups.com >>>> >>>> <https://groups.google.com/d/msgid/tiddlywiki/21677588-663c-40ad-8292-745c5a2f0b18%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/8bd985cb-ab99-4563-bb4d-2de8e5259729%40googlegroups.com.
