Function to convert Hypixel network experience to a level in JS/TS

convert.js

// Code adapted from https://github.com/HypixelDev/PublicAPI/blob/master/Java/src/main/java/net/hypixel/api/util/ILeveling.java

const BASE = 10_000
const GROWTH = 2_500

console.log(BASE + GROWTH)

const REVERSE_PQ_PREFIX = -(BASE - 0.5 * GROWTH) / GROWTH;
const REVERSE_CONST = REVERSE_PQ_PREFIX * REVERSE_PQ_PREFIX;
const GROWTH_DIVIDES_2 = 2 / GROWTH;

function calculate(exp) {
    return exp < 0 ? 1 : Math.floor(1 + REVERSE_PQ_PREFIX + Math.sqrt(REVERSE_CONST + GROWTH_DIVIDES_2 * exp));
}

console.log(calculate("5094162"))