Dice-rolls NPM

Dice Rolls

Dependency free dice roller for table top style gaming rules

The Dice Rolls library is a lightweight, dependency-free tool designed to facilitate dice rolling within your projects. Whether you're developing a game, building an application, or creating interactive content, this library simplifies the process of rolling standard table top dice including d4, d6, d8, d10, d12, and d20.

Features

Simple syntax for specifying the number and type of dice to roll.
Roll any quantity of dice, with or without a modifer.
Get a total result, or an array of results representing each roll.
Static helpers for min/max possibilities, and single roll.
Class helpers for min/max results, counts, and result filtering
Lightweight and dependency-free, making it easy to integrate into any project.

Installation

To use the Dice Roll Library in your project, simply add the package to your project and include it in your project source.

bun add dice-rolls@latest

import Roll from "dice-rolls"

Usage

Using the Dice Rolls Library is straightforward. Simply create a new Roll object with the desired dice notation, and call the result. The rolls are executed on contruction of the object and are near instantly available. Trying to roll a non-defined dice will roll a d20 instead, because errors aren't desireable in a simple library. And since the project is TypeScript native, it ships with definitions so the Dice definition lists only the valid dice faces of 4, 6, 8, 10, 12 and 20.

In this example, 3d6 indicates rolling three six-sided dice. Three rolls are executed on contruction and the results are immediatly available.

// Create a new Roll object with 3d6 notation
const roll = new Roll("3d6")

console.log("Result:", roll.result) // Result: 12
console.log("Results:", roll.results) // Results: [ 5, 3, 4 ]

In this example, we just get the result of the roll directly using the default d20 dice.

// The default Roll is 1d20
const roll = new Roll().result

console.log("Result:", roll) // Result: 17

In this example, a +2 modifier is added to the result of two twelve-sided dice.

// The modifier is added to the total, not each roll
const roll = new Roll("2d12", 2)

console.log("Result:", roll.result) // Result: 17
console.log("Results:", roll.results) // Results: [ 8, 7 ]

Structure

The resulting object from calling a new Roll() contains the following readonly properties;

result - the total of the dice rolls, plus the modifier.
results - an array of numbers representing each dice roll.
faces - the number of faces on the dice rolled.
modifier - if defeined, the numeric value added to the results to give the final result. Otherwise undefined

Helpers

The Roll class also has two static helper methods

Roll.d(n) to roll a single dice with n faces, and
Roll.minMax("3d6") to calculate and return the minimum and maximum values for the roll, with optional modifier

const roll = Roll.d(20) // 1-20

const [min, max] = Roll.minMax("3d6", 1) // [ 4, 19 ]

The resulting object after creation also contains helper methods to assist in quickly targeting results

min returns the lowest roll
max returns the highest roll
count return a list of each of the counts for each face, including zeros, and
where filters using simple mathematical notation

const roll = new Roll("6d8", 2).results // [ 2, 5, 3, 3, 8, 6 ]

roll.max() // 8
roll.min() // 2

roll.count() // { 1: 0, 2: 1, 3: 2, 4: 0, 5: 1, 6: 1, 7: 0, 8: 1 }
roll.count(8) // 1
roll.count()[8] // 1
roll.count(">5") // 2

roll.where("<=3").results // [ 2, 3, 3 ]

roll.where(">=5").where("<8").result // 13 (5 + 6 = 11) + 2

roll.where("<5").max() // 3

Contributing

Contributions to the Dice Rolls Library are welcome! If you have ideas for improvements, bug fixes, or new features, feel free to open an issue or submit a pull request on our GitHub repository.

License

The Dice Rolls Library is open source and released under the Apache License, Version 2.0. See the LICENSE file for details.

For more information, please visit the GitHub repository.

Tests

bun run test

src/test/roll.spec.ts:
✓ Roll.d static method > should roll a d20
✓ Roll.d static method > should roll a d6
✓ Roll.minMax static method > should return the minimum and maximum values of a 3d6 roll
✓ Roll.minMax static method > should return the minimum and maximum values of a 3d6 roll with a +5 modifier
✓ Roll.minMax static method > should return the minimum and maximum values of a 2d12 roll with a -2 modifier
✓ Specify a Dice to roll > should roll a d4
✓ Specify a Dice to roll > should roll a d6
✓ Specify a Dice to roll > should roll a d8
✓ Specify a Dice to roll > should roll a d10
✓ Specify a Dice to roll > should roll a d12
✓ Specify a Dice to roll > should roll a d20
✓ A non-specific roll > should roll a d20 (with no arguments)
✓ A non-specific roll > should roll a d20 (for anything but d4, d6, d8, d10, d12 or d20)
✓ Specify a quantity of Dice > should roll 3d6
✓ Specify a quantity of Dice > should roll 3d6 with a +5 modifier
✓ Specify a quantity of Dice > should roll 2d12 with a -2 modifier
✓ Rolling 32d6 > should have a result in the middle third of the mathematical spread
✓ Rolling 32d6 > should have a maximum roll count grater than the minimum roll count
✓ Rolling 32d6 > should have a non-uniform distribution ▅▆▅▇▆▃
✓ Min/Max results > should return the minimum roll from the set of 4d6
✓ Min/Max results > should return the maximum roll from the set of 4d6
✓ Counting results of 10d6 > should count each of the '1' results
✓ Counting results of 10d6 > should count each of the '2' results
✓ Counting results of 10d6 > should count each of the '3' results
✓ Counting results of 10d6 > should count each of the '4' results
✓ Counting results of 10d6 > should count each of the '5' results
✓ Counting results of 10d6 > should count each of the '6' results
✓ Counting results of 10d6 > should be able to directly access a count for face '1'
✓ Counting results of 10d6 > should be able to directly access a count for face '2'
✓ Counting results of 10d6 > should be able to directly access a count for face '3'
✓ Counting results of 10d6 > should be able to directly access a count for face '4'
✓ Counting results of 10d6 > should be able to directly access a count for face '5'
✓ Counting results of 10d6 > should be able to directly access a count for face '6'
✓ Counting results of 10d6 > should return a count of zero for a non-existent face
✓ Counting results of 10d6 > should return a count of results equal to '3'
✓ Counting results of 10d6 > should return a count of results greater than 3
✓ Filtering results > should filter results where the roll is greater than 3
✓ Filtering results > should filter results where the roll is equal to 6
✓ Filtering results > should filter results where the roll is less than or equal to 5
✓ Filtering results > should filter results where the roll is greater than 3 and less than 5
✓ Filtering results > should filter the results and return a new sum result using the original modifier
✓ Statistical Probability > should randomly distribute a d4 over 64 rolls ▅▅▇▃
✓ Statistical Probability > should have no more than 2 uniform counts
✓ Statistical Probability > should randomly distribute a d4 over 256 rolls ▆▃▃▇
✓ Statistical Probability > should have no more than 2 uniform counts
✓ Statistical Probability > should randomly distribute a d4 over 4096 rolls ▅▃▃▇
✓ Statistical Probability > should have no more than 1 uniform counts
✓ Statistical Probability > should randomly distribute a d4 over 65536 rolls ▆▇▃▇
✓ Statistical Probability > should have no more than 1 uniform counts
✓ Statistical Probability > should randomly distribute a d6 over 64 rolls ▇▃▆▃▆▃
✓ Statistical Probability > should have no more than 3 uniform counts
✓ Statistical Probability > should randomly distribute a d6 over 256 rolls ▆▆▅▇▇▃
✓ Statistical Probability > should have no more than 3 uniform counts
✓ Statistical Probability > should randomly distribute a d6 over 4096 rolls ▆▆▆▇▆▃
✓ Statistical Probability > should have no more than 2 uniform counts
✓ Statistical Probability > should randomly distribute a d6 over 65536 rolls ▃▇▃▃▆▅
✓ Statistical Probability > should have no more than 2 uniform counts
✓ Statistical Probability > should randomly distribute a d8 over 64 rolls ▇▆▆▅▆▆▃▅
✓ Statistical Probability > should have no more than 4 uniform counts
✓ Statistical Probability > should randomly distribute a d8 over 256 rolls ▅▆▅▇▅▃▅▆
✓ Statistical Probability > should have no more than 3 uniform counts
✓ Statistical Probability > should randomly distribute a d8 over 4096 rolls ▃▃▅▅▇▇▅▅
✓ Statistical Probability > should have no more than 2 uniform counts
✓ Statistical Probability > should randomly distribute a d8 over 65536 rolls ▇▃▅▇▆▇▇▆
✓ Statistical Probability > should have no more than 2 uniform counts
✓ Statistical Probability > should randomly distribute a d10 over 64 rolls ▅▃▆▇▃▆▃▅▆▇
✓ Statistical Probability > should have no more than 5 uniform counts
✓ Statistical Probability > should randomly distribute a d10 over 256 rolls ▇▆▃▆▆▅▆▆▆▆
✓ Statistical Probability > should have no more than 4 uniform counts
✓ Statistical Probability > should randomly distribute a d10 over 4096 rolls ▆▃▃▇▇▃▆▆▃▇
✓ Statistical Probability > should have no more than 3 uniform counts
✓ Statistical Probability > should randomly distribute a d10 over 65536 rolls ▆▆▃▆▅▆▅▆▆▇
✓ Statistical Probability > should have no more than 2 uniform counts
✓ Statistical Probability > should randomly distribute a d12 over 64 rolls ▆▅▆▆▆▃▆▅▅▇▅▃
✓ Statistical Probability > should have no more than 6 uniform counts
✓ Statistical Probability > should randomly distribute a d12 over 256 rolls ▅▃▆▆▅▃▃▇▅▅▆▅
✓ Statistical Probability > should have no more than 5 uniform counts
✓ Statistical Probability > should randomly distribute a d12 over 4096 rolls ▇▆▅▇▆▅▆▇▆▆▇▃
✓ Statistical Probability > should have no more than 3 uniform counts
✓ Statistical Probability > should randomly distribute a d12 over 65536 rolls ▅▃▃▅▇▅▅▃▅▃▆▇
✓ Statistical Probability > should have no more than 3 uniform counts
✓ Statistical Probability > should randomly distribute a d20 over 64 rolls ▇▃▆▅▇▅▃▅▅▅▅▆▅▅▅▅▆▅▆▆
✓ Statistical Probability > should have no more than 10 uniform counts
✓ Statistical Probability > should randomly distribute a d20 over 256 rolls ▅▆▆▆▇▅▅▆▆▅▆▆▅▆▅▅▆▅▆▃
✓ Statistical Probability > should have no more than 8 uniform counts
✓ Statistical Probability > should randomly distribute a d20 over 4096 rolls ▅▆▅▅▅▆▆▇▆▇▇▅▇▅▆▅▆▃▆▅
✓ Statistical Probability > should have no more than 5 uniform counts
✓ Statistical Probability > should randomly distribute a d20 over 65536 rolls ▆▆▇▆▆▇▆▆▅▅▆▇▆▇▆▃▃▅▃▃
✓ Statistical Probability > should have no more than 4 uniform counts
--------------|---------|---------|-------------------
File          | % Funcs | % Lines | Uncovered Line #s
--------------|---------|---------|-------------------
All files     |  100.00 |  100.00 |
 src/dice.ts  |  100.00 |  100.00 |
 src/index.ts |  100.00 |  100.00 |
 src/roll.ts  |  100.00 |  100.00 |
--------------|---------|---------|-------------------

 89 pass
 0 fail
 609 expect() calls
Ran 89 tests across 1 files. [31.00ms]

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