A function for splitting an iterable into multiple filtered iterables.

array_utils.rb

module ArrayUtils

	def group(groupings)
		return groupings.transform_values { |predicate| self.filter(predicate) }
	end

end

groupIterable.kt

public fun <T> Iterable<T>.group(groupings: Map<String, (T) -> Boolean>): Map<String, Iterable<T>>
		= groupings.mapValues { ( _, predicate ) -> filter(predicate) }

IterableUtils.java

import com.google.common.collect.Iterables;
import com.google.common.collect.Maps;

public final class IterableUtils {

	public static <T> Map<String, Iterable<T>> group(Iterable<T> input, Map<String, Predicate<T>> groupings) {
		return Maps.transformValues(groupings, (predicate) -> Iterables.filter(input, predicate));
	}

	private IterableUtils() {}

}