softkave-js-utils/build/other/combineTokens.js

JavaScript & Typescript utility functions, types, and classes

import { getRandomInt } from '../number/index.js';
const kDefaultFilterFn = () => true;
export function combineTokens(tokens, count) {
    const spentRecord = {};
    const result = [];
    const getAvailableTokens = (index) => {
        return tokens.filter(token => {
            const spent = spentRecord[token.token] || 0;
            const filterFn = token.filterFn || kDefaultFilterFn;
            return filterFn(index, spent, result);
        });
    };
    for (let i = 0, available = getAvailableTokens(i); i < count && available.length > 0; i++, available = getAvailableTokens(i)) {
        const index = getRandomInt(0, available.length);
        const token = available[index];
        spentRecord[token.token] = (spentRecord[token.token] || 0) + 1;
        result.push(token.token);
    }
    return result;
}
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