Sep 10, 2021 · Depending on your downstream operations, you can also consider playing with goupingBy () from the standard library. GoupingBy is lazy, and might be more complementary …

Apr 11, 2025 · The following example demonstrates how to group strings by their first letter using the groupingBy() function, count the elements in each group, and then iterate through each …

Sep 2, 2024 · By mastering Kotlin groupBy, you can efficiently perform operations on grouped data, enhancing your ability to handle various data manipulation tasks in Kotlin. With these …

Dec 30, 2023 · Read on for an introduction to the most important functions for grouping: groupBy, partition, groupingBy, fold, reduce, aggregate and their variants. The groupBy function is the …

Jun 15, 2025 · The Kotlin Standard Library provides useful functions like groupBy() and groupingBy() to easily perform grouping operations on collections. These functions help us …

This function belongs to the Kotlin standard library and provides a convenient way to group elements into a map, where the keys are the results of the key selector function and the values …

Oct 30, 2019 · Since groupBy keeps emitting the data to the inner flows after emitting the flows themselves to the downstream, you have to be very careful with how you collect them. You …

Dec 5, 2024 · One of these is the ability to group list items by a property efficiently and effectively. Grouping is particularly useful when we want to organize a list into sublists based on a specific …

Groups elements of the original array by the key returned by the given keySelector function applied to each element and returns a map where each group key is associated with a list of …

The returned Grouping can be considered a bit like a map from a key to a list of elements, but it supports far fewer operations. However, since using it might be an important optimization, let's …