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https://github.com/retraigo/fortuna
A TypeScript module for random events and gacha (random sampling with weights).
https://github.com/retraigo/fortuna
deno dice gacha random toss-a-coin typescript weighted-random-choice
Last synced: 12 days ago
JSON representation
A TypeScript module for random events and gacha (random sampling with weights).
- Host: GitHub
- URL: https://github.com/retraigo/fortuna
- Owner: retraigo
- License: mit
- Created: 2022-03-20T13:45:14.000Z (over 2 years ago)
- Default Branch: main
- Last Pushed: 2024-09-14T06:07:18.000Z (about 2 months ago)
- Last Synced: 2024-10-11T20:57:11.344Z (28 days ago)
- Topics: deno, dice, gacha, random, toss-a-coin, typescript, weighted-random-choice
- Language: TypeScript
- Homepage:
- Size: 616 KB
- Stars: 20
- Watchers: 1
- Forks: 0
- Open Issues: 0
-
Metadata Files:
- Readme: README.md
- Contributing: CONTRIBUTING.md
- Funding: .github/FUNDING.yml
- License: LICENSE
Awesome Lists containing this project
- awesome-deno - fortuna - Weighted gacha system. (Modules / Utils)
README
# Fortuna
The quick solution for everything random!
A Gacha-like system to roll random items with weights.
## Usage
More weight = more common. Think of it as in terms of probability.
```js
// Deno
import { GachaMachine } from "https://deno.land/x/fortuna/mod.ts"
// JSR
import { GachaMachine } from "jsr:@nekooftheabyss/[email protected]"
// Node
import { GachaMachine } from "@nekooftheabyss/fortuna"
// esm.sh
import { GachaMachine } from "https://esm.sh/jsr/@nekooftheabyss/[email protected]"
const items = [
{ result: "SSR cool character", chance: 1 },
{ result: "Kinda rare character", chance: 3 },
{ result: "Mob character #1", chance: 5 },
{ result: "Mob character #2", chance: 5 },
{ result: "Mob character #3", chance: 5 },
]
const machine = new GachaMachine(items)
machine.get(10) // Rolls 10x
/*
My result:
[
"Kinda rare character",
"Mob character #1",
"Mob character #3",
"Mob character #3",
"Mob character #1",
"Kinda rare character",
"Mob character #2",
"Mob character #2" ,
"Mob character #1",
"Mob character #2"
]
*/
```
### Rolling distinct elements
You can roll distinct elements using the `LimitedGachaMachine`. It is slower
than `GachaMachine` but there shouldn't be much noticeable difference.
The "distinct" behavior only applies to within a single `.get()` call. It
doesn't affect the pool of items used when initializing `new LimitedGachaMachine()`.
```js
import { LimitedGachaMachine } from "https://deno.land/x/fortuna/mod.ts"
// JSR
import { LimitedGachaMachine } from "jsr:@nekooftheabyss/[email protected]"
const items = [
{ result: "SSR cool character", chance: 1 },
{ result: "Kinda rare character", chance: 3 },
{ result: "Mob character #1", chance: 5 },
{ result: "Mob character #2", chance: 5 },
{ result: "Mob character #3", chance: 5 },
]
const machine = new LimitedGachaMachine(items)
machine.get(4) // Rolls 4x
/*
My result:
[
"Kinda rare character",
"Mob character #1",
"Mob character #3",
"Mob character #2",
]
*/
```
### Plain weighted random selection
You probably don't need all complicated stuff. Here's a quick way to just create a simple weight-based gacha system:
(Only works on v3.0.1 and above)
```ts
import { roll } from "jsr:@nekooftheabyss/[email protected]/roll"; // wherever you are importing from.
const items = [
{ result: "SSR cool character", chance: 1 },
{ result: "Kinda rare character", chance: 3 },
{ result: "Mob character #1", chance: 5 },
{ result: "Mob character #2", chance: 5 },
{ result: "Mob character #3", chance: 5 },
];
roll(items); // Rolls one item from the list of items using linear search.
```
You can also provide two individual arrays for choices and weights.
```ts
import { roll } from "jsr:@nekooftheabyss/[email protected]/roll"; // wherever you are importing from.
const items = [
"SSR cool character",
"Kinda rare character",
"Mob character #1",
"Mob character #2",
"Mob character #3",
];
const chances = [1, 3, 5, 5, 5];
roll(items, chances); // Rolls one item from the list of items using linear search.
```
Providing the total chance may result in faster rolls.
```ts
import { roll } from "jsr:@nekooftheabyss/[email protected]/roll"; // wherever you are importing from.
const items = [
{ result: "SSR cool character", chance: 1 },
{ result: "Kinda rare character", chance: 3 },
{ result: "Mob character #1", chance: 5 },
{ result: "Mob character #2", chance: 5 },
{ result: "Mob character #3", chance: 5 },
];
roll(items, 19); // Rolls one item from the list of items using linear search.
```
```ts
import { roll } from "jsr:@nekooftheabyss/[email protected]/roll"; // wherever you are importing from.
const items = [
"SSR cool character",
"Kinda rare character",
"Mob character #1",
"Mob character #2",
"Mob character #3",
];
const chances = [1, 3, 5, 5, 5];
roll(items, chances, 19); // Rolls one item from the list of items using linear search.
```
## Documentation
Documentation for the latest version can be found in [jsr:@nekooftheabyss/fortuna](https://jsr.io/@nekooftheabyss/fortuna)