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• devutility.internal
• 1.1.7
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• StreamHelper.java

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devutility.internal.util.StreamHelper Maven / Gradle / Ivy

package devutility.internal.util;

import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;
import java.util.function.Function;
import java.util.function.Predicate;

public class StreamHelper {
	// region distinct by key

	public static  Predicate distinctByKey(Function keyExtractor) {
		Map map = new ConcurrentHashMap<>();
		return t -> map.putIfAbsent(keyExtractor.apply(t), Boolean.TRUE) == null;
	}

	// endregion
}