🏠 New in High Baseline Support: Array grouping

September 5, 2026

caniuse · mdn · spec

The Object.groupBy() and Map.groupBy() static methods group values of arrays and iterables based on a function that returns a key for each value.

Source features

• javascript.builtins.Map.groupBy [mdn]
• javascript.builtins.Object.groupBy [mdn]