Mathematica: Webel ADT pseudo classes: POLICY: The Abstract Data Types (ADTs) are stateless functional (although inheritance and overrides are supported), with no caching by default (although there is nice optional caching using CreateUUID[] and Once[]).

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Note kind

CONVENTION

POLICY

Policy level

STRICT

Webel Mathematica keywords

ADT`

Webel ADT

ADT-Method

Keywords

An ADT-Method function in the Webel recipe for strong types has no state and always returns the same expression given the same input, for any ADTs of the same ADT signature.

There is a slight "side door" concerning some necessary use of at least some "globals" for special development and testing reasons, but that can be ignored as pedantic for the purposes of the definition here.

There is another slight "side door". Where performance is an issue, the Mathematica Once[] caching mechanism may optionally be used:

Mathematica: SUPER TIP: Use CreateUUID[] to trigger recalculation against Once[] to create a flexible optionally caching function! (May incur a memory penalty, consider also using a 'loc' persistence location.)

Mathematica: Webel ADT pseudo classes: POLICY: Where an ADT-Method uses UUID-driven Once[] caching the trigger argument is a String '$uuid' which MUST have a default None and MUST be the first argument that has a default.

If you want to try OO with support for state in Mathematica consider trying the (not fully fledged but very useful) user-contributed MTools package for (some) OO in Mathematica.

Relates to

Mathematica: POLICY NOTES for the Webel Abstract Data Type (ADT) pseudo classes with inheritance for the Wolfram Language

Dr Darren of Webel IT Australia makes the case for better object-orientation for Mathematica using pseudo class ADTs without losing the super-functional power of the Wolfram Language

XL$Row and XL$Cell under the hood

XL$Cell value resolution for “text” requires an XL$ResourcesMap (Real, Integer, and Boolean value resolution does not)

UUID-driven Once-caching. Example: XL$Cell value resolution with an XL$ResourcesMap

XL$Cell with a VBA formula and XL$F

XL$RowList vs XL$Row vs XL$Cell

Related notes