randomize-with-percentage/dist/index.js

randomize-with-percentage is a typescript library for randomized get items with percentages.

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
function randomize(items) {
    const allPercentageSum = items.reduce((acc, item) => acc + item.percent, 0);
    if (allPercentageSum !== 100) {
        throw new Error("All percentages sum must be 100");
    }
    const biggestDecimalLength = items.reduce((acc, item) => {
        const decimal = item.percent.toString().split(".")[1];
        if (!decimal)
            return acc;
        const decimalLength = Number(decimal.split("").length);
        if (acc < decimalLength)
            return decimalLength;
        return acc;
    }, 0);
    const decimalGrowth = Math.pow(10, biggestDecimalLength);
    const random = Math.floor(Math.random() * 100 * decimalGrowth);
    let totalPercentPassed = 0;
    const selectedListItem = items.find((item) => {
        totalPercentPassed += item.percent * decimalGrowth;
        if (random < totalPercentPassed)
            return true;
        return false;
    });
    return {
        value: selectedListItem.value,
        selectedListItem,
    };
}
exports.default = randomize;
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