Override .mapTo and .mapToVoid to narrow types (#3090)

Author: adamkopec

vavr/src/main/java/io/vavr/Lazy.java

@@ -223,6 +223,16 @@ public <U> Lazy<U> map(Function<? super T, ? extends U> mapper) {
         return Lazy.of(() -> mapper.apply(get()));
     }
 
+    @Override
+    public <U> Lazy<U> mapTo(U value) {
+        return map(ignored -> value);
+    }
+
+    @Override
+    public Lazy<Void> mapToVoid() {
+        return map(ignored -> null);
+    }
+
     @Override
     public Lazy<T> peek(Consumer<? super T> action) {
         action.accept(get());

vavr/src/main/java/io/vavr/Value.java

@@ -70,6 +70,8 @@
  * <li>{@link #getOrElseTry(CheckedFunction0)}</li>
  * <li>{@link #getOrNull()}</li>
  * <li>{@link #map(Function)}</li>
+ * <li>{@link #mapTo(Object)}</li>
+ * <li>{@link #mapToVoid()}</li>
  * <li>{@link #stringPrefix()}</li>
  * </ul>
  *

vavr/src/main/java/io/vavr/collection/Array.java

@@ -971,6 +971,16 @@ public <U> Array<U> map(Function<? super T, ? extends U> mapper) {
         return wrap(arr);
     }
 
+    @Override
+    public <U> Array<U> mapTo(U value) {
+        return map(ignored -> value);
+    }
+
+    @Override
+    public Array<Void> mapToVoid() {
+        return map(ignored -> null);
+    }
+
     @Override
     public Array<T> orElse(Iterable<? extends T> other) {
         return isEmpty() ? ofAll(other) : this;

vavr/src/main/java/io/vavr/collection/BitSet.java

@@ -588,6 +588,16 @@ default <U> SortedSet<U> map(Function<? super T, ? extends U> mapper) {
         return map(Comparators.naturalComparator(), mapper);
     }
 
+    @Override
+    default <U> SortedSet<U> mapTo(U value) {
+        return map(ignored -> value);
+    }
+
+    @Override
+    default SortedSet<Void> mapToVoid() {
+        return map(ignored -> null);
+    }
+
     @Override
     BitSet<T> remove(T element);
 

vavr/src/main/java/io/vavr/collection/CharSeq.java

@@ -668,6 +668,16 @@ public <U> IndexedSeq<U> map(Function<? super Character, ? extends U> mapper) {
         return result;
     }
 
+    @Override
+    public <U> IndexedSeq<U> mapTo(U value) {
+        return map(ignored -> value);
+    }
+
+    @Override
+    public IndexedSeq<Void> mapToVoid() {
+        return map(ignored -> null);
+    }
+
     @Override
     public String mkString() {
         return back;

vavr/src/main/java/io/vavr/collection/HashSet.java

@@ -714,6 +714,16 @@ public <U> HashSet<U> map(Function<? super T, ? extends U> mapper) {
         }
     }
 
+    @Override
+    public <U> HashSet<U> mapTo(U value) {
+        return map(ignored -> value);
+    }
+
+    @Override
+    public HashSet<Void> mapToVoid() {
+        return map(ignored -> null);
+    }
+
     @Override
     public String mkString(CharSequence prefix, CharSequence delimiter, CharSequence suffix) {
         return iterator().mkString(prefix, delimiter, suffix);

vavr/src/main/java/io/vavr/collection/IndexedSeq.java

@@ -230,6 +230,16 @@ default int lastIndexWhere(Predicate<? super T> predicate, int end) {
     @Override
     <U> IndexedSeq<U> map(Function<? super T, ? extends U> mapper);
 
+    @Override
+    default <U> IndexedSeq<U> mapTo(U value) {
+        return map(ignored -> value);
+    }
+
+    @Override
+    default IndexedSeq<Void> mapToVoid() {
+        return map(ignored -> null);
+    }
+
     @Override
     IndexedSeq<T> orElse(Iterable<? extends T> other);
 

vavr/src/main/java/io/vavr/collection/Iterator.java

@@ -1701,6 +1701,16 @@ public U getNext() {
         }
     }
 
+    @Override
+    default <U> Iterator<U> mapTo(U value) {
+        return map(ignored -> value);
+    }
+
+    @Override
+    default Iterator<Void> mapToVoid() {
+        return map(ignored -> null);
+    }
+
     @Override
     default Iterator<T> orElse(Iterable<? extends T> other) {
         return isEmpty() ? ofAll(other) : this;

vavr/src/main/java/io/vavr/collection/LinearSeq.java

@@ -212,6 +212,16 @@ default int lastIndexWhere(Predicate<? super T> predicate, int end) {
     @Override
     <U> LinearSeq<U> map(Function<? super T, ? extends U> mapper);
 
+    @Override
+    default <U> LinearSeq<U> mapTo(U value) {
+        return map(ignored -> value);
+    }
+
+    @Override
+    default LinearSeq<Void> mapToVoid() {
+        return map(ignored -> null);
+    }
+
     @Override
     LinearSeq<T> orElse(Iterable<? extends T> other);
 

vavr/src/main/java/io/vavr/collection/LinkedHashSet.java

@@ -735,6 +735,16 @@ public <U> LinkedHashSet<U> map(Function<? super T, ? extends U> mapper) {
         }
     }
 
+    @Override
+    public <U> LinkedHashSet<U> mapTo(U value) {
+        return map(ignored -> value);
+    }
+
+    @Override
+    public LinkedHashSet<Void> mapToVoid() {
+        return map(ignored -> null);
+    }
+
     @Override
     public String mkString(CharSequence prefix, CharSequence delimiter, CharSequence suffix) {
         return iterator().mkString(prefix, delimiter, suffix);