xxl.mathematica.map.GroupBy Maven / Gradle / Ivy

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package xxl.mathematica.map;

import java.util.List;
import java.util.Map;
import java.util.function.Function;

/**
 * 分组
 */
public class GroupBy {
    /**
     * 分组
     *
     * @param 
     * @param 
     * @return
     */
    public static  Map> groupBy(List list, Function f) {
        return io.vavr.collection.List.ofAll(list)
                .groupBy(f)
                .mapValues(io.vavr.collection.List::asJava)
                .toJavaMap();
    }
}