The quick solution for everything random!
A Gacha-like system to roll random items with weights.
More weight = more common. Think of it as in terms of probability.
// 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"
]
*/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().
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",
]
*/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)
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.
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.
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.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 for the latest version can be found in jsr:@nekooftheabyss/fortuna