Module:PageVars/doc

Description

This module calculates one or more expressions and substitutes the results into a single block of wikitext.

Its primary purpose is to avoid repeating the same `` calculation multiple times on a page. It calculates all values once and allows them to be reused in the provided text. This is a safe, stateless alternative to the Variable extensions that works correctly with the future Parsoid MediaWiki parser.

Usage

The module has one function: calculateAndDisplay. It is called with the following structure:

{{#invoke:PageVars|calculateAndDisplay
| name1 = formula1
| name2 = formula2
| ...
| display = Wikitext using $name1$ and $name2$...
}}

Parameters

• display: (Required) A block of wikitext that will be displayed. This text can contain placeholders that correspond to the names of the formulas.
• name1, name2, etc.: (Required) User-defined names for the variables.
  • The name is used for the placeholder (e.g., prob_A becomes $prob_A$).
  • The value is the formula to be calculated by the parser function (e.g., 3 / 13 round 4).

Example

This example calculates two different probabilities and uses them in two separate paragraphs within a single call.

Code

{{#invoke:PageVars|calculateAndDisplay
| prob_A = 3 / 13 round 4
| prob_B = 1 / 7 round 4
| display =
The probability of event A is '''$prob_A$'''.

The probability of event B is '''$prob_B$'''.

We can then compare $prob_A$ and $prob_B$ to determine the likely outcome based on these two independent calculations. All values were calculated in a single, efficient operation.
}}

Result

The probability of event A is 0.2308.

The probability of event B is 0.1429.

We can then compare 0.2308 and 0.1429 to determine the likely outcome based on these two independent calculations. All values were calculated in a single, efficient operation.