Добавлены свойства для массива

src/main/java/com/annimon/ownlang/lib/ArrayValue.java

@@ -1,6 +1,7 @@
 package com.annimon.ownlang.lib;
 
 import com.annimon.ownlang.exceptions.TypeException;
+import com.annimon.ownlang.exceptions.UnknownPropertyException;
 import java.util.Arrays;
 import java.util.Iterator;
 import java.util.List;
@@ -78,29 +79,45 @@ public class ArrayValue implements Value, Iterable<Value> {
     public int type() {
         return Types.ARRAY;
     }
-    
+
     public int size() {
         return elements.length;
     }
-    
+
     public Value get(int index) {
         return elements[index];
     }
-    
+
+    public Value get(Value index) {
+        final String prop = index.asString();
+        switch (prop) {
+            // Properties
+            case "length":
+                return NumberValue.of(size());
+
+            // Functions
+            case "isEmpty":
+                return NumberValue.fromBoolean(size() == 0);
+
+            default:
+                return get(index.asInt());
+        }
+    }
+
     public void set(int index, Value value) {
         elements[index] = value;
     }
-    
+
     @Override
     public Object raw() {
         return elements;
     }
-    
+
     @Override
     public int asInt() {
         throw new TypeException("Cannot cast array to integer");
     }
-    
+
     @Override
     public double asNumber() {
         throw new TypeException("Cannot cast array to number");
@@ -132,7 +149,7 @@ public class ArrayValue implements Value, Iterable<Value> {
         final ArrayValue other = (ArrayValue) obj;
         return Arrays.deepEquals(this.elements, other.elements);
     }
-    
+
     @Override
     public int compareTo(Value o) {
         if (o.type() == Types.ARRAY) {

src/main/java/com/annimon/ownlang/parser/ast/ContainerAccessExpression.java

@@ -43,8 +43,7 @@ public final class ContainerAccessExpression implements Expression, Accessible {
         final Value lastIndex = lastIndex();
         switch (container.type()) {
             case Types.ARRAY:
-                final int arrayIndex = lastIndex.asInt();
-                return ((ArrayValue) container).get(arrayIndex);
+                return ((ArrayValue) container).get(lastIndex);
 
             case Types.MAP:
                 return ((MapValue) container).get(lastIndex);

src/test/java/com/annimon/ownlang/parser/ProgramsTest.java

@@ -1,6 +1,7 @@
 package com.annimon.ownlang.parser;
 
 import com.annimon.ownlang.Console;
+import com.annimon.ownlang.lib.FunctionValue;
 import com.annimon.ownlang.lib.Functions;
 import com.annimon.ownlang.lib.NumberValue;
 import com.annimon.ownlang.lib.Variables;
@@ -83,6 +84,15 @@ public class ProgramsTest {
             assertFalse(args[0].asInt() != 0);
             return NumberValue.ONE;
         });
+        Functions.set("assertFail", (args) -> {
+            try {
+                ((FunctionValue) args[0]).getValue().execute();
+                fail("Function should fail");
+            } catch (Throwable thr) {
+
+            }
+            return NumberValue.ONE;
+        });
     }
 
     @Test

src/test/resources/other/arrayFunctions.own

@@ -0,0 +1,26 @@
+def testSetUnknownKey() = assertFail(def() {
+    arr = [1, 2, 3]
+    arr.one = 1
+  })
+
+def testSetLengthProperty() = assertFail(def() {
+    arr = [1, 2, 3]
+    arr.length = 10
+  })
+
+def testGetLength() {
+  arr = [1, 2, 3]
+  assertEquals(3, arr.length)
+}
+
+def testGetLengthInnerArray() {
+  arr = [[1, 2, 3], [1, 2, [3, 4, 5, 6]]]
+  assertEquals(2, arr.length)
+  assertEquals(3, arr[0].length)
+  assertEquals(4, arr[1][2].length)
+}
+
+def testIsEmpty() {
+  arr = [1, 2, 3]
+  assertFalse(arr.isEmpty)
+}