Add Array.findLast and findLastIndex from ES2023

Also implement it for the typed arrays variants.
There are no test262 changes because our version of test262 is old and
does not contain them yet.

rhino/src/main/java/org/mozilla/javascript/ArrayLikeAbstractOperations.java

@@ -18,6 +18,8 @@ public enum IterativeOperation {
         SOME,
         FIND,
         FIND_INDEX,
+        FIND_LAST,
+        FIND_LAST_INDEX,
     }
 
     public enum ReduceOperation {
@@ -35,7 +37,10 @@ public static Object iterativeMethod(
             Object[] args) {
         Scriptable o = ScriptRuntime.toObject(cx, scope, thisObj);
 
-        if (IterativeOperation.FIND == operation || IterativeOperation.FIND_INDEX == operation) {
+        if (IterativeOperation.FIND == operation
+                || IterativeOperation.FIND_INDEX == operation
+                || IterativeOperation.FIND_LAST == operation
+                || IterativeOperation.FIND_LAST_INDEX == operation) {
             requireObjectCoercible(cx, o, fun);
         }
 
@@ -62,12 +67,29 @@ public static Object iterativeMethod(
             array = cx.newArray(scope, resultLength);
         }
         long j = 0;
-        for (long i = 0; i < length; i++) {
+        long start =
+                (operation == IterativeOperation.FIND_LAST
+                                || operation == IterativeOperation.FIND_LAST_INDEX)
+                        ? length - 1
+                        : 0;
+        long end =
+                (operation == IterativeOperation.FIND_LAST
+                                || operation == IterativeOperation.FIND_LAST_INDEX)
+                        ? -1
+                        : length;
+        long increment =
+                (operation == IterativeOperation.FIND_LAST
+                                || operation == IterativeOperation.FIND_LAST_INDEX)
+                        ? -1
+                        : +1;
+        for (long i = start; i != end; i += increment) {
             Object[] innerArgs = new Object[3];
             Object elem = getRawElem(o, i);
             if (elem == NOT_FOUND) {
                 if (operation == IterativeOperation.FIND
-                        || operation == IterativeOperation.FIND_INDEX) {
+                        || operation == IterativeOperation.FIND_INDEX
+                        || operation == IterativeOperation.FIND_LAST
+                        || operation == IterativeOperation.FIND_LAST_INDEX) {
                     elem = Undefined.instance;
                 } else {
                     continue;
@@ -93,9 +115,11 @@ public static Object iterativeMethod(
                     if (ScriptRuntime.toBoolean(result)) return Boolean.TRUE;
                     break;
                 case FIND:
+                case FIND_LAST:
                     if (ScriptRuntime.toBoolean(result)) return elem;
                     break;
                 case FIND_INDEX:
+                case FIND_LAST_INDEX:
                     if (ScriptRuntime.toBoolean(result)) return ScriptRuntime.wrapNumber(i);
                     break;
             }
@@ -109,6 +133,7 @@ public static Object iterativeMethod(
             case SOME:
                 return Boolean.FALSE;
             case FIND_INDEX:
+            case FIND_LAST_INDEX:
                 return ScriptRuntime.wrapNumber(-1);
             case FOR_EACH:
             default:

rhino/src/main/java/org/mozilla/javascript/NativeArray.java

@@ -169,6 +169,8 @@ protected void fillConstructorProperties(IdFunctionObject ctor) {
         addIdFunctionProperty(ctor, ARRAY_TAG, ConstructorId_some, "some", 1);
         addIdFunctionProperty(ctor, ARRAY_TAG, ConstructorId_find, "find", 1);
         addIdFunctionProperty(ctor, ARRAY_TAG, ConstructorId_findIndex, "findIndex", 1);
+        addIdFunctionProperty(ctor, ARRAY_TAG, ConstructorId_findLast, "findLast", 1);
+        addIdFunctionProperty(ctor, ARRAY_TAG, ConstructorId_findLastIndex, "findLastIndex", 1);
         addIdFunctionProperty(ctor, ARRAY_TAG, ConstructorId_reduce, "reduce", 1);
         addIdFunctionProperty(ctor, ARRAY_TAG, ConstructorId_reduceRight, "reduceRight", 1);
         addIdFunctionProperty(ctor, ARRAY_TAG, ConstructorId_isArray, "isArray", 1);
@@ -279,6 +281,14 @@ protected void initPrototypeId(int id) {
                 arity = 1;
                 s = "findIndex";
                 break;
+            case Id_findLast:
+                arity = 1;
+                s = "findLast";
+                break;
+            case Id_findLastIndex:
+                arity = 1;
+                s = "findLastIndex";
+                break;
             case Id_reduce:
                 arity = 1;
                 s = "reduce";
@@ -359,6 +369,8 @@ public Object execIdCall(
                 case ConstructorId_some:
                 case ConstructorId_find:
                 case ConstructorId_findIndex:
+                case ConstructorId_findLast:
+                case ConstructorId_findLastIndex:
                 case ConstructorId_reduce:
                 case ConstructorId_reduceRight:
                     {
@@ -491,6 +503,14 @@ public Object execIdCall(
                 case Id_findIndex:
                     return ArrayLikeAbstractOperations.iterativeMethod(
                             cx, f, IterativeOperation.FIND_INDEX, scope, thisObj, args);
+                case Id_findLast:
+                    return ArrayLikeAbstractOperations.iterativeMethod(
+                            cx, f, IterativeOperation.FIND_LAST, scope, thisObj, args);
+
+                case Id_findLastIndex:
+                    return ArrayLikeAbstractOperations.iterativeMethod(
+                            cx, f, IterativeOperation.FIND_LAST_INDEX, scope, thisObj, args);
+
                 case Id_reduce:
                     return ArrayLikeAbstractOperations.reduceMethod(
                             cx, ReduceOperation.REDUCE, scope, thisObj, args);
@@ -2504,6 +2524,12 @@ protected int findPrototypeId(String s) {
             case "findIndex":
                 id = Id_findIndex;
                 break;
+            case "findLast":
+                id = Id_findLast;
+                break;
+            case "findLastIndex":
+                id = Id_findLastIndex;
+                break;
             case "reduce":
                 id = Id_reduce;
                 break;
@@ -2567,17 +2593,19 @@ protected int findPrototypeId(String s) {
             Id_some = 21,
             Id_find = 22,
             Id_findIndex = 23,
-            Id_reduce = 24,
-            Id_reduceRight = 25,
-            Id_fill = 26,
-            Id_keys = 27,
-            Id_values = 28,
-            Id_entries = 29,
-            Id_includes = 30,
-            Id_copyWithin = 31,
-            Id_at = 32,
-            Id_flat = 33,
-            Id_flatMap = 34,
+            Id_findLast = 24,
+            Id_findLastIndex = 25,
+            Id_reduce = 26,
+            Id_reduceRight = 27,
+            Id_fill = 28,
+            Id_keys = 29,
+            Id_values = 30,
+            Id_entries = 31,
+            Id_includes = 32,
+            Id_copyWithin = 33,
+            Id_at = 34,
+            Id_flat = 35,
+            Id_flatMap = 36,
             SymbolId_unscopables = 35,
             MAX_PROTOTYPE_ID = SymbolId_unscopables;
     private static final int ConstructorId_join = -Id_join,
@@ -2599,11 +2627,13 @@ protected int findPrototypeId(String s) {
             ConstructorId_some = -Id_some,
             ConstructorId_find = -Id_find,
             ConstructorId_findIndex = -Id_findIndex,
+            ConstructorId_findLast = -Id_findLast,
+            ConstructorId_findLastIndex = -Id_findLastIndex,
             ConstructorId_reduce = -Id_reduce,
             ConstructorId_reduceRight = -Id_reduceRight,
-            ConstructorId_isArray = -26,
-            ConstructorId_of = -27,
-            ConstructorId_from = -28;
+            ConstructorId_isArray = -28,
+            ConstructorId_of = -29,
+            ConstructorId_from = -30;
 
     /** Internal representation of the JavaScript array's length property. */
     private long length;

rhino/src/main/java/org/mozilla/javascript/typedarrays/NativeTypedArrayView.java

@@ -771,6 +771,12 @@ public Object execIdCall(
             case Id_findIndex:
                 return ArrayLikeAbstractOperations.iterativeMethod(
                         cx, f, IterativeOperation.FIND_INDEX, scope, thisObj, args);
+            case Id_findLast:
+                return ArrayLikeAbstractOperations.iterativeMethod(
+                        cx, f, IterativeOperation.FIND_LAST, scope, thisObj, args);
+            case Id_findLastIndex:
+                return ArrayLikeAbstractOperations.iterativeMethod(
+                        cx, f, IterativeOperation.FIND_LAST_INDEX, scope, thisObj, args);
             case Id_reduce:
                 return ArrayLikeAbstractOperations.reduceMethod(
                         cx, ReduceOperation.REDUCE, scope, thisObj, args);
@@ -898,6 +904,14 @@ protected void initPrototypeId(int id) {
                 arity = 1;
                 s = "findIndex";
                 break;
+            case Id_findLast:
+                arity = 1;
+                s = "findLast";
+                break;
+            case Id_findLastIndex:
+                arity = 1;
+                s = "findLastIndex";
+                break;
             case Id_reduce:
                 arity = 1;
                 s = "reduce";
@@ -1002,6 +1016,12 @@ protected int findPrototypeId(String s) {
             case "findIndex":
                 id = Id_findIndex;
                 break;
+            case "findLast":
+                id = Id_findLast;
+                break;
+            case "findLastIndex":
+                id = Id_findLastIndex;
+                break;
             case "reduce":
                 id = Id_reduce;
                 break;
@@ -1042,9 +1062,11 @@ protected int findPrototypeId(String s) {
             Id_some = 24,
             Id_find = 25,
             Id_findIndex = 26,
-            Id_reduce = 27,
-            Id_reduceRight = 28,
-            SymbolId_iterator = 29;
+            Id_findLast = 27,
+            Id_findLastIndex = 28,
+            Id_reduce = 29,
+            Id_reduceRight = 30,
+            SymbolId_iterator = 31;
 
     protected static final int MAX_PROTOTYPE_ID = SymbolId_iterator;
 

tests/src/test/java/org/mozilla/javascript/tests/es2023/ArrayFindLastIndexTest.java

@@ -0,0 +1,14 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+package org.mozilla.javascript.tests.es2023;
+
+import org.mozilla.javascript.Context;
+import org.mozilla.javascript.drivers.LanguageVersion;
+import org.mozilla.javascript.drivers.RhinoTest;
+import org.mozilla.javascript.drivers.ScriptTestsBase;
+
+@RhinoTest("testsrc/jstests/es2023/array-findLastIndex.js")
+@LanguageVersion(Context.VERSION_ES6)
+public class ArrayFindLastIndexTest extends ScriptTestsBase {}

tests/src/test/java/org/mozilla/javascript/tests/es2023/ArrayFindLastTest.java

@@ -0,0 +1,14 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+package org.mozilla.javascript.tests.es2023;
+
+import org.mozilla.javascript.Context;
+import org.mozilla.javascript.drivers.LanguageVersion;
+import org.mozilla.javascript.drivers.RhinoTest;
+import org.mozilla.javascript.drivers.ScriptTestsBase;
+
+@RhinoTest("testsrc/jstests/es2023/array-findLast.js")
+@LanguageVersion(Context.VERSION_ES6)
+public class ArrayFindLastTest extends ScriptTestsBase {}

tests/src/test/java/org/mozilla/javascript/tests/es2023/TypedArrayFindLastIndexTest.java

@@ -0,0 +1,14 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+package org.mozilla.javascript.tests.es2023;
+
+import org.mozilla.javascript.Context;
+import org.mozilla.javascript.drivers.LanguageVersion;
+import org.mozilla.javascript.drivers.RhinoTest;
+import org.mozilla.javascript.drivers.ScriptTestsBase;
+
+@RhinoTest("testsrc/jstests/es2023/typed-array-find-last-index.js")
+@LanguageVersion(Context.VERSION_ES6)
+public class TypedArrayFindLastIndexTest extends ScriptTestsBase {}

tests/src/test/java/org/mozilla/javascript/tests/es2023/TypedArrayFindLastTest.java

@@ -0,0 +1,14 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+package org.mozilla.javascript.tests.es2023;
+
+import org.mozilla.javascript.Context;
+import org.mozilla.javascript.drivers.LanguageVersion;
+import org.mozilla.javascript.drivers.RhinoTest;
+import org.mozilla.javascript.drivers.ScriptTestsBase;
+
+@RhinoTest("testsrc/jstests/es2023/typed-array-find-last.js")
+@LanguageVersion(Context.VERSION_ES6)
+public class TypedArrayFindLastTest extends ScriptTestsBase {}