Thanks for this explanation Eric! I've made a note in my wiki!
On Saturday, December 2, 2017 at 11:24:52 PM UTC-6, Eric Shulman wrote:
>
> On Saturday, December 2, 2017 at 7:29:05 PM UTC-8, Diego Mesa wrote:
>>
>> Can some one clarify on the use of << vs < when referencing variables...
>>
>
> In TiddlyWiki *content*, variables are referenced using <<variableName>>.
> The double-bracket syntax is used to avoid conflicts with standard HTML
> syntax (i.e., <b> starts normal HTML bold formatting, while <<b>> embeds
> the value of a TiddlyWiki variable named "b")
>
> However, within TiddlyWiki *filters*, there is no need doubling the
> brackets, as HTML is not allowed *within* the filter, so only single
> <variableName> is used.
>
> ...and why I don't have to wrap <fieldname> with [<fieldname>] before
>> giving it to split.
>
>
> Think of the brackets in filters as part of the operand itself rather than
> a "container" for the operand. The type of bracket indicates the type of
> operand being used:
> use [...] for literal values, e.g., [texthere]
> use {...} for field references, e.g., {!!fieldname}
> use <...> for variables e.g. <currentTiddler>
>
> Thus, to split the literal text, "sometext", you could write:
> [title[sometext]splitbefore[t]removesuffix[t]]
> you would get "some" as a result.
>
> If the value "sometext" is stored in a field named "somefield" in the
> current tiddler, you could write:
> [{!!somefield}splitbefore[t]removesuffix[t]]
>
> and, if the value "sometext" is stored in a variable named "somevariable",
> you could write:
> [<somevariable>splitbefore[t]removesuffix[t]]
>
> As a slightly more complex example, suppose the value to split on was also
> stored in a variable. Then you could write:
> [<somevariable>splitbefore<othervariable>removesuffix<othervariable>]
>
> hope this helps,
>
> enjoy,
> -e
> Eric Shulman
> TiddlyTools.com: "Small Tools for Big Ideas!" (tm)
> InsideTiddlyWiki: The Missing Manuals
>
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