Adding analyzer feedback for karls language concept exercise

config.json

@@ -80,7 +80,6 @@
         ],
         "prerequisites": [
           "arrays",
-          "for-loops",
           "strings"
         ],
         "status": "active"

exercises/concept/karls-languages/.docs/hints.md

@@ -2,31 +2,37 @@
 
 ## 1. Define a function to check if the language list is empty
 
-- Try using the [`isEmpty()`](https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/util/List.html#isEmpty()) method.
+- Try using the [`isEmpty()`][isempty] method.
 
 ## 2. Define a function to add a language to the list
 
-- Try using the [`add(E element)`](https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/util/List.html#add(E)) method.
+- Try using the [`add(E element)`][add] method.
 - Reminder: methods that return `void` do not need any `return` statements.
 
 ## 3. Define a function to remove a language from the list
 
-- Try using the [`remove(Object o)`](https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/util/List.html#remove(java.lang.Object)) method.
+- Try using the [`remove(Object o)`][remove] method.
 - Reminder: methods that return `void` do not need any `return` statements.
 
 ## 4. Define a function to return the first item in the list
 
-- Try using the [`get(int index)`](https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/util/List.html#get(int)) method.
+- Try using the [`get(int index)`][get] method.
 
 ## 5. Define a function to return how many languages are in the list
 
-- Try using the [`size()`](https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/util/List.html#size()) method.
+- Try using the [`size()`][size] method.
 
 ## 6. Define a function to determine if a language is in the list
 
-- Try using the [`contains(Object o)`](https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/util/List.html#contains(java.lang.Object)) method.
+- Try using the [`contains(Object o)`][contains] method.
 
 ## 7. Define a function to determine if the list is exciting
 
-- Try using a [for-each loop](https://docs.oracle.com/javase/tutorial/java/nutsandbolts/for.html) through all of the elements, checking each one.
-- Alternatively, try using the `containsLanguage` method from the previous step.
+- Try using the `containsLanguage` method from the previous step.
+
+[isempty]: https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/util/List.html#isEmpty()
+[add]: https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/util/List.html#add(E)
+[remove]: https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/util/List.html#remove(java.lang.Object)
+[get]: https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/util/List.html#get(int)
+[size]: https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/util/List.html#size()
+[contains]: https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/util/List.html#contains(java.lang.Object)

exercises/concept/karls-languages/.meta/design.md

@@ -43,6 +43,19 @@ This Concepts Exercise's Concepts are:
 
 This Concept Exercise's prerequisites Concepts are:
 
-- `for-loops`: know how to use a for-loop to iterate over a collection.
 - `arrays`: know of the array collection type and that it has a fixed length.
 - `strings`: data types used in this exercise
+
+## Analyzer
+
+This exercise could benefit from the following rules in the [analyzer]:
+
+- `essential`: If the student did not reuse the implementation of the `containsLanguage` method in the `isExciting` method, instruct them to do so.
+  Explain that reusing existing code instead of copy-pasting can help make code easier to maintain.
+- `actionable`: If the solution did not use `contains` in the method `containsLanguage`, instruct the student to do so.
+- `actionable`: If the solution did not use `isEmpty` in the method `isEmpty`, instruct the student to do so.
+
+If the solution does not receive any of the above feedback, it must be exemplar.
+Leave a `celebratory` comment to celebrate the success!
+
+[analyzer]: https://github.com/exercism/java-analyzer

exercises/concept/karls-languages/.meta/src/reference/java/LanguageList.java

@@ -29,11 +29,6 @@ public boolean containsLanguage(String language) {
     }
 
     public boolean isExciting() {
-        for (String language : languages) {
-            if (language.equals("Java") || language.equals("Kotlin")) {
-                return true;
-            }
-        }
-        return false;
+        return containsLanguage("Java") || containsLanguage("Kotlin");
     }
 }