Combining data into groups—like Object.groupBy and Map.groupBy in JavaScript—allows you to compute higher order datasets, like grouping employees by department.

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Learn how to group arrays in JavaScript efficiently using new features like Object.groupBy and Map.groupBy introduced in 2024. The post provides code examples on how to group data using these methods compared to traditional reduce method. TypeScript 5.4 supports these new APIs with appropriate configuration.

Array Grouping in JavaScript