F!! Query.join with transformer

Author: actions-user

approvaltests-util-tests/src/test/java/org/lambda/query/QueryableTest.java

@@ -183,4 +183,10 @@ void testJoin()
     String result = Queryable.as("hello", null, "world").join("_");
     assertEquals("hello_null_world", result);
   }
+  @Test
+  void testJoinWithTransformation()
+  {
+    String result = Queryable.as("Hello", "World").join("_", String::toUpperCase);
+    assertEquals("HELLO_WORLD", result);
+  }
 }

approvaltests-util/src/main/java/org/lambda/query/Queryable.java

@@ -165,4 +165,8 @@ public String join(String joinCharacter)
   {
     return String.join(joinCharacter, this.select(t -> "" + t));
   }
+  public <Out> String join(String joinCharacter, Function1<In, Out> transformer)
+  {
+    return String.join(joinCharacter, this.select(t -> "" + transformer.call(t)));
+  }
 }