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The `groupBy` function in JavaScript is used to group elements of an array based on a specified key. It returns a map where keys are the unique values of the specified key and values are arrays of items that share the same key.
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Temporal is a proposal for a modern date and time API, aiming to improve upon the existing `Date` object by providing better functionality for handling dates, times, and time zones. It offers features like date manipulation, formatting, parsing, and time zone management.
The `groupBy` function in JavaScript is used to group elements of an array based on a specified key. It returns a map where keys are the unique values of the specified key and values are arrays of items that share the same key.