Kotlin List To Map Groupby
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Kotlin List To Map Groupby
In this map, each key is the lambda result and the corresponding value is the list of elements on which this result is returned. Map<k, list> (source) 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 corresponding elements. Keys will be the lambda result and list of groups corresponding to keys will actually be those lists on which result is applied.
As we can see in above program, result. } if (item is secondentity) container [second] = item.result.count if (item is thridentity) container. Groupby method of kotlin is used to group similar items of a collection.
Groups elements of the original array by the key returned by the given keyselector function applied to each element and puts to the destination map each group key associated with a list of corresponding elements.
In this map, each key is the result of lambda and corresponding value is the list of elements. You can produce the same groups using the filter () function, but groupby () is preferable because it only performs the grouping once. In this map, each key is the lambda result and the corresponding value is the list of elements on which this result is returned. The only difference is that we don’t specify the value for it since it will only be mapped by that.
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