array.groupBy() and array.groupByToMap() methods let's you group an array by a certain criteria.

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The new array group proposal introduces new methods array.groupBy() and array. groupByToMap(). Their polyfills are available in core-js library. The method groupBy() requires less code and is easier to understand than using product.reduce() . The Map() method accepts any data type a key.

Array Grouping in JavaScript

<p>You’ll have to use reduce method in some cases but for these types of situations this is awesome!</p>
