redis-smq-common/dist/esm/src/async/map.js

RedisSMQ Common Library provides many components that are mainly used by RedisSMQ and RedisSMQ Monitor.

import { parallel } from './parallel.js';
export function map(items, operation, chunkSize, callback) {
    if (items.length === 0) {
        return callback(null, []);
    }
    const results = [];
    const processChunk = (startIndex, chunkIndex = 1) => {
        if (startIndex >= items.length) {
            return callback(null, results);
        }
        const endIndex = Math.min(startIndex + chunkSize, items.length);
        const chunkItems = items.slice(startIndex, endIndex);
        parallel(chunkItems.map((item) => (cb) => {
            try {
                operation(item, (err, result) => {
                    if (err) {
                        return cb(err);
                    }
                    return cb(null, result);
                });
            }
            catch (error) {
                const err = error instanceof Error ? error : new Error(String(error));
                return cb(err);
            }
        }), (err, chunkResults) => {
            if (err)
                return callback(err);
            results.push(...chunkResults);
            setImmediate(() => processChunk(endIndex, chunkIndex + 1));
        });
    };
    processChunk(0);
}
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