groupjs_by Library Offers Grouped Aggregation Beyond Native JavaScript Object.groupBy

A new open-source JavaScript library called groupjs_by has been released to address limitations in the native Object.groupBy() method introduced in modern JavaScript. While the native method splits arrays into grouped buckets, it requires additional reduce() loops to perform aggregations such as sums, averages, or counts. groupjs_by chains operations like .sum(), .count(), and .average() in a single pass, aimed at developers building dashboards or data reporting pipelines. The library supports multi-key grouping, nested JSON accessors, and automatically skips null or non-numeric values to prevent NaN errors. It is available via npm with zero dependencies and includes TypeScript support and performance benchmarks on GitHub.