# Dice Rolling

## Welcome to dndR!

I am a big fan of both R and Dungeons and Dragons so I thought it would be fun to combine the two and build an R package that supports other fans of this hobby! dndR includes functions for several facets of D&D and I’ve broken these categories into separate, dedicated vignettes. As dice rolling is arguably the most fundamental element of D&D, this first vignette focuses on the dice rolling functions included in the package.

If any of these functions break for you, please post an Issue so that I can fix the issue as soon as possible.

## Flexible Dice Rolling

At its simplest, D&D involves significant amounts of dice rolling and (often) summing their values, so dndR includes a roll function! This function supports ‘rolling’ up to 10 million of any dice type and returns the sum of their outcomes.

# Roll three six-sided dice
dndR::roll(dice = "3d6")
#> [1] 12

If desired, you can set the show_dice argument to message the individual dice outcomes that make up that total.

# Roll four four-sided dice and show the per-dice results
dndR::roll(dice = "4d4", show_dice = TRUE)
#> Individual rolls: 4, 2, 4, 4
#> [1] 14

If you are rolling for a character that has a feature that allows them to re-roll ones, roll also supports re-rolling ones once and keeping the re-rolled value. If a one is detected, a message will be printed indicating that it has been re-rolled.

# Re-roll low values (if any)
dndR::roll(dice = "10d10", re_roll = TRUE)
#> Re-rolling 1s
#> [1] 66

Because the sum of the individual dice is returned by roll, you can use it multiple times if you want to roll multiple types of dice and sum them together.

# Roll 1d10 and 2d8
dndR::roll(dice = "1d10") + dndR::roll(dice = "2d8")
#> [1] 13

## Simple Dice Rolling

If you’d rather keep things simple, there are also helper functions for each of the standard dice types. The ‘standard’ dice types include dice with the following number of faces: 100, 20, 12, 10, 8, 6, 4, and 2. These functions do not accept any arguments and simply “roll” one of the respective die.

# Roll one twenty-sided die
dndR::d20()
#> [1] 18

Just for fun, there is also a coin helper function that is analogous to a two-sided dice (i.e., “d2”)

# Flip a coin
dndR::coin()
#> [1] 1