FunctionalM.findBy

solita · Apr 15, 2024 · 127f3ab · 127f3ab
1 parent 3f64479
commit 127f3ab
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Showing 2 changed files with 8 additions and 1 deletion.
diff --git a/pom.xml b/pom.xml
@@ -2,7 +2,7 @@
     <modelVersion>4.0.0</modelVersion>
     <groupId>fi.solita.utils</groupId>
     <artifactId>functional-utils</artifactId>
-    <version>0.12.49</version>
+    <version>0.12.50</version>
     <build>
         <resources>
                 <resource>

diff --git a/src/main/java/fi/solita/utils/functional/FunctionalM.java b/src/main/java/fi/solita/utils/functional/FunctionalM.java
@@ -24,6 +24,13 @@ public static final <K, V> Option<V> find(K key, Map<? super K, V> map) {
         return FunctionalImpl.find(key, map);
     }
 
+    /**
+     * @return values in {@code map} whose keys satisfy {@code predicate}.
+     */
+    public static final <K, V> Iterable<V> findBy(Apply<? super K, Boolean> predicate, Map<K, V> map) {
+        return FunctionalImpl.map(Transformers.<V>right(), FunctionalImpl.filter(Transformers.<K>left().andThen(predicate), map.entrySet()));
+    }
+
     /**
      * @return elements in {@code map} whose entries satisfy {@code predicate}.
      */