Logic Rolls

An Add-on Module for Foundry Virtual Tabletop

Author: Whistler Project Source: Project URL Version 10 Last Updated 3 months ago

Logic Rolls

This module adds logic functions to the roll formulas.


All functions operate based on the assumption that zero is false and non-zero is true. All functions return 1 for true and 0 for false. This is convenient for multiplication.

The functions include eq(a, b) (equals) ne(a, b) (not equal), not(a) (negation), gt(a, b) (a greater than b), gte(a, b) (a greater than or equal to b), lt(a, b) (a less than b), lte(a, b) (a less than or equal to b), and(a, b, ...) (all arguments are non-zero), or(a, b, ...) some arguments are non-zero.

There is also an if function, but if is a reserved word in javascript so I had to pick something else so I settled on pick(condition, then, otherwise). The second and third parameter can be omitted, they will default to 1 and 0. The inverse is unless(condition, then, otherwise) that inverts the condition, i.e. picks then if the condition is false.


These can be used wherever rolls can be made/evaluated. If you give a dagger this damage formula 1d4 + @mod + pick(gt(, 1), 1d12), the dagger will include an extra 1d12 in the damage if the user's intelligence modifier is greater than 1.

Note that the functions do not change dice rolled. All dice in the statement are always rolled, the conditionals just change which numbers are included in the final calculation. This limits their usefulness in some cases, while they are useful elsewhere.


Available Versions

  1. Version 10.1

    Compatible Foundry Versions: 10 - 10 Installation Link: Manifest URL Update Notes: Read Notes