diff --git a/program.own b/program.own
index 25141c6..b861f63 100644
--- a/program.own
+++ b/program.own
@@ -87,4 +87,6 @@ for i = 0, i < 4, i = i + 1 {
 map = {"+" : add, "-" : sub. "*" : mul, "/" : div}
 //print map["+"]
 print "\n"
-print function(map["+"], 4, 5)
\ No newline at end of file
+print function(map["+"], 4, 5)
+print "\n"
+foreach(map, def(op, func) = echo (4, op, 5, "=", func(4,5)))
diff --git a/src/com/annimon/ownlang/lib/ArrayValue.java b/src/com/annimon/ownlang/lib/ArrayValue.java
index fbee729..9a570df 100644
--- a/src/com/annimon/ownlang/lib/ArrayValue.java
+++ b/src/com/annimon/ownlang/lib/ArrayValue.java
@@ -1,12 +1,13 @@
 package com.annimon.ownlang.lib;
 
 import java.util.Arrays;
+import java.util.Iterator;
 
 /**
  *
  * @author aNNiMON
  */
-public final class ArrayValue implements Value {
+public final class ArrayValue implements Value, Iterable<Value> {
     
     private final Value[] elements;
 
@@ -41,6 +42,11 @@ public final class ArrayValue implements Value {
         return Arrays.toString(elements);
     }
 
+    @Override
+    public Iterator<Value> iterator() {
+        return Arrays.asList(elements).iterator();
+    }
+
     @Override
     public int hashCode() {
         int hash = 5;
@@ -57,8 +63,6 @@ public final class ArrayValue implements Value {
         final ArrayValue other = (ArrayValue) obj;
         return Arrays.deepEquals(this.elements, other.elements);
     }
-    
-    
 
     @Override
     public String toString() {
diff --git a/src/com/annimon/ownlang/lib/MapValue.java b/src/com/annimon/ownlang/lib/MapValue.java
index c636a17..fb54763 100644
--- a/src/com/annimon/ownlang/lib/MapValue.java
+++ b/src/com/annimon/ownlang/lib/MapValue.java
@@ -1,6 +1,7 @@
 package com.annimon.ownlang.lib;
 
 import java.util.HashMap;
+import java.util.Iterator;
 import java.util.Map;
 import java.util.Objects;
 
@@ -8,14 +9,18 @@ import java.util.Objects;
  *
  * @author aNNiMON
  */
-public final class MapValue implements Value {
+public class MapValue implements Value, Iterable<Map.Entry<Value, Value>> {
     
     private final Map<Value, Value> map;
 
     public MapValue(int size) {
         this.map = new HashMap<>(size);
     }
-    
+
+    public MapValue(Map<Value, Value> map) {
+        this.map = map;
+    }
+
     public Value get(Value key) {
         return map.get(key);
     }
@@ -23,7 +28,7 @@ public final class MapValue implements Value {
     public void set(Value key, Value value) {
         map.put(key, value);
     }
-    
+
     @Override
     public double asNumber() {
         throw new RuntimeException("Cannot cast map to number");
@@ -34,6 +39,11 @@ public final class MapValue implements Value {
         return map.toString();
     }
 
+    @Override
+    public Iterator<Map.Entry<Value, Value>> iterator() {
+        return map.entrySet().iterator();
+    }
+
     @Override
     public int hashCode() {
         int hash = 5;
@@ -51,8 +61,6 @@ public final class MapValue implements Value {
         return Objects.equals(this.map, other.map);
     }
     
-    
-
     @Override
     public String toString() {
         return asString();
diff --git a/src/com/annimon/ownlang/lib/modules/functions/std_foreach.java b/src/com/annimon/ownlang/lib/modules/functions/std_foreach.java
new file mode 100644
index 0000000..eac4b96
--- /dev/null
+++ b/src/com/annimon/ownlang/lib/modules/functions/std_foreach.java
@@ -0,0 +1,32 @@
+package com.annimon.ownlang.lib.modules.functions;
+
+import com.annimon.ownlang.lib.*;
+
+import java.util.Map;
+
+public final class std_foreach implements Function {
+
+    @Override
+    public Value execute(Value... args) {
+        if (args.length != 2) return NumberValue.ZERO;
+
+        if (!(args[1] instanceof FunctionValue)) return NumberValue.ZERO;
+        final Function function = ((FunctionValue) args[1]).getValue();
+        final Value container = args[0];
+        if (container instanceof ArrayValue) {
+            final ArrayValue array = (ArrayValue) container;
+            for (Value element : array) {
+                function.execute(element);
+            }
+            return NumberValue.ZERO;
+        }
+        if (container instanceof MapValue) {
+            final MapValue map = (MapValue) container;
+            for (Map.Entry<Value, Value> element : map) {
+                function.execute(element.getKey(), element.getValue());
+            }
+            return NumberValue.ZERO;
+        }
+        return NumberValue.ZERO;
+    }
+}
\ No newline at end of file
diff --git a/src/com/annimon/ownlang/lib/modules/std.java b/src/com/annimon/ownlang/lib/modules/std.java
index 3b8c725..dfa4409 100644
--- a/src/com/annimon/ownlang/lib/modules/std.java
+++ b/src/com/annimon/ownlang/lib/modules/std.java
@@ -1,13 +1,7 @@
 package com.annimon.ownlang.lib.modules;
 
 import com.annimon.ownlang.lib.*;
-import com.annimon.ownlang.lib.modules.functions.std_echo;
-import com.annimon.ownlang.lib.modules.functions.std_foreach;
-import com.annimon.ownlang.lib.modules.functions.std_newarray;
-import com.annimon.ownlang.lib.modules.functions.std_rand;
-import com.annimon.ownlang.lib.modules.functions.std_sleep;
-import com.annimon.ownlang.lib.modules.functions.std_thread;
-import java.util.Random;
+import com.annimon.ownlang.lib.modules.functions.*;
 
 /**
  *
@@ -18,6 +12,7 @@ public final class std implements Module {
     @Override
     public void init() {
         Functions.set("echo", new std_echo());
+        Functions.set("foreach", new std_foreach());
         Functions.set("newarray", new std_newarray());
         Functions.set("rand", new std_rand());
         Functions.set("sleep", new std_sleep());