Initial commit to show approach for arrays native

classlib/src/main/java/org/teavm/classlib/java/util/JSArraysGenerator.java

@@ -0,0 +1,32 @@
+/*
+ *  Copyright 2025 ihromant.
+ *
+ *  Licensed under the Apache License, Version 2.0 (the "License");
+ *  you may not use this file except in compliance with the License.
+ *  You may obtain a copy of the License at
+ *
+ *       http://www.apache.org/licenses/LICENSE-2.0
+ *
+ *  Unless required by applicable law or agreed to in writing, software
+ *  distributed under the License is distributed on an "AS IS" BASIS,
+ *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *  See the License for the specific language governing permissions and
+ *  limitations under the License.
+ */
+package org.teavm.classlib.java.util;
+
+import org.teavm.backend.javascript.spi.Injector;
+import org.teavm.backend.javascript.spi.InjectorContext;
+import org.teavm.model.MethodReference;
+
+public class JSArraysGenerator implements Injector {
+    @Override
+    public void generate(InjectorContext context, MethodReference methodRef) {
+        switch (methodRef.getName()) {
+            case "sortIntJS":
+                context.writeExpr(context.getArgument(0));
+                context.getWriter().append(".data.sort()");
+                break;
+        }
+    }
+}

classlib/src/main/java/org/teavm/classlib/java/util/TArrays.java

@@ -23,6 +23,8 @@
 import java.util.function.IntToDoubleFunction;
 import java.util.function.IntToLongFunction;
 import java.util.function.IntUnaryOperator;
+import org.teavm.backend.javascript.spi.InjectedBy;
+import org.teavm.classlib.PlatformDetector;
 import org.teavm.classlib.java.lang.TIllegalArgumentException;
 import org.teavm.classlib.java.lang.TMath;
 import org.teavm.classlib.java.lang.TObject;
@@ -488,7 +490,14 @@ public static void sort(int[] a, int fromIndex, int toIndex) {
         }
     }
 
+    @InjectedBy(JSArraysGenerator.class)
+    private static native void sortIntJS(int[] arr);
+
     public static void sort(int[] a) {
+        if (PlatformDetector.isJavaScript()) {
+            sortIntJS(a);
+            return;
+        }
         if (a.length == 0) {
             return;
         }

tests/src/test/java/org/teavm/classlib/java/util/ArraysTest.java

@@ -32,6 +32,14 @@
 public class ArraysTest {
     @Test
     public void arraySorted() {
+        int[] intArr = { 2, 5, 7, 3, 5, 6 };
+        Arrays.sort(intArr);
+        assertEquals(2, intArr[0]);
+        assertEquals(3, intArr[1]);
+        assertEquals(5, intArr[2]);
+        assertEquals(5, intArr[3]);
+        assertEquals(6, intArr[4]);
+        assertEquals(7, intArr[5]);
         Integer[] array = { 2, 5, 7, 3, 5, 6 };
         Arrays.sort(array);
         assertEquals(Integer.valueOf(2), array[0]);