diff --git a/src/com/annimon/ownlang/lib/modules/functions/std_arrayCombine.java b/src/com/annimon/ownlang/lib/modules/functions/std_arrayCombine.java
new file mode 100644
index 0000000..9e43c19
--- /dev/null
+++ b/src/com/annimon/ownlang/lib/modules/functions/std_arrayCombine.java
@@ -0,0 +1,30 @@
+package com.annimon.ownlang.lib.modules.functions;
+
+import com.annimon.ownlang.exceptions.ArgumentsMismatchException;
+import com.annimon.ownlang.exceptions.TypeException;
+import com.annimon.ownlang.lib.*;
+
+public final class std_arrayCombine implements Function {
+
+    @Override
+    public Value execute(Value... args) {
+        if (args.length != 2) throw new ArgumentsMismatchException("Two arguments expected");
+        if (args[0].type() != Types.ARRAY) {
+            throw new TypeException("Array expected in first argument");
+        }
+        if (args[1].type() != Types.ARRAY) {
+            throw new TypeException("Array expected in second argument");
+        }
+        
+        final ArrayValue keys = ((ArrayValue) args[0]);
+        final ArrayValue values = ((ArrayValue) args[1]);
+        final int length = Math.min(keys.size(), values.size());
+        
+        final MapValue result = new MapValue(length);
+        for (int i = 0; i < length; i++) {
+            result.set(keys.get(i), values.get(i));
+        }
+        return result;
+    }
+    
+}
\ No newline at end of file
diff --git a/src/com/annimon/ownlang/lib/modules/functions/std_arrayKeyExists.java b/src/com/annimon/ownlang/lib/modules/functions/std_arrayKeyExists.java
new file mode 100644
index 0000000..30a3967
--- /dev/null
+++ b/src/com/annimon/ownlang/lib/modules/functions/std_arrayKeyExists.java
@@ -0,0 +1,19 @@
+package com.annimon.ownlang.lib.modules.functions;
+
+import com.annimon.ownlang.exceptions.ArgumentsMismatchException;
+import com.annimon.ownlang.exceptions.TypeException;
+import com.annimon.ownlang.lib.*;
+
+public final class std_arrayKeyExists implements Function {
+
+    @Override
+    public Value execute(Value... args) {
+        if (args.length != 2) throw new ArgumentsMismatchException("Two arguments expected");
+        if (args[1].type() != Types.MAP) {
+            throw new TypeException("Map expected in second argument");
+        }
+        final MapValue map = ((MapValue) args[1]);
+        return NumberValue.fromBoolean(map.containsKey(args[0]));
+    }
+    
+}
\ No newline at end of file
diff --git a/src/com/annimon/ownlang/lib/modules/functions/std_arrayKeys.java b/src/com/annimon/ownlang/lib/modules/functions/std_arrayKeys.java
new file mode 100644
index 0000000..11c27b8
--- /dev/null
+++ b/src/com/annimon/ownlang/lib/modules/functions/std_arrayKeys.java
@@ -0,0 +1,26 @@
+package com.annimon.ownlang.lib.modules.functions;
+
+import com.annimon.ownlang.exceptions.ArgumentsMismatchException;
+import com.annimon.ownlang.exceptions.TypeException;
+import com.annimon.ownlang.lib.*;
+import java.util.ArrayList;
+import java.util.List;
+import java.util.Map;
+
+public final class std_arrayKeys implements Function {
+
+    @Override
+    public Value execute(Value... args) {
+        if (args.length != 1) throw new ArgumentsMismatchException("One argument expected");
+        if (args[0].type() != Types.MAP) {
+            throw new TypeException("Map expected in first argument");
+        }
+        final MapValue map = ((MapValue) args[0]);
+        final List<Value> keys = new ArrayList<>(map.size());
+        for (Map.Entry<Value, Value> entry : map) {
+            keys.add(entry.getKey());
+        }
+        return new ArrayValue(keys);
+    }
+    
+}
\ No newline at end of file
diff --git a/src/com/annimon/ownlang/lib/modules/functions/std_arrayValues.java b/src/com/annimon/ownlang/lib/modules/functions/std_arrayValues.java
new file mode 100644
index 0000000..fdd147e
--- /dev/null
+++ b/src/com/annimon/ownlang/lib/modules/functions/std_arrayValues.java
@@ -0,0 +1,26 @@
+package com.annimon.ownlang.lib.modules.functions;
+
+import com.annimon.ownlang.exceptions.ArgumentsMismatchException;
+import com.annimon.ownlang.exceptions.TypeException;
+import com.annimon.ownlang.lib.*;
+import java.util.ArrayList;
+import java.util.List;
+import java.util.Map;
+
+public final class std_arrayValues implements Function {
+
+    @Override
+    public Value execute(Value... args) {
+        if (args.length != 1) throw new ArgumentsMismatchException("One argument expected");
+        if (args[0].type() != Types.MAP) {
+            throw new TypeException("Map expected in first argument");
+        }
+        final MapValue map = ((MapValue) args[0]);
+        final List<Value> values = new ArrayList<>(map.size());
+        for (Map.Entry<Value, Value> entry : map) {
+            values.add(entry.getValue());
+        }
+        return new ArrayValue(values);
+    }
+    
+}
\ 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 9422a5f..7fceb41 100644
--- a/src/com/annimon/ownlang/lib/modules/std.java
+++ b/src/com/annimon/ownlang/lib/modules/std.java
@@ -13,8 +13,6 @@ public final class std implements Module {
     public void init() {
         Functions.set("echo", new std_echo());
         Functions.set("readln", new std_readln());
-        Functions.set("newarray", new std_newarray());
-        Functions.set("sort", new std_sort());
         Functions.set("length", new std_length());
         Functions.set("rand", new std_rand());
         Functions.set("time", new std_time());
@@ -36,5 +34,13 @@ public final class std implements Module {
         Functions.set("replace", new std_replace());
         Functions.set("replaceAll", new std_replaceall());
         Functions.set("replaceFirst", new std_replacefirst());
+        
+        // Arrays and maps
+        Functions.set("newarray", new std_newarray());
+        Functions.set("sort", new std_sort());
+        Functions.set("arrayCombine", new std_arrayCombine());
+        Functions.set("arrayKeyExists ", new std_arrayKeyExists());
+        Functions.set("arrayKeys ", new std_arrayKeys());
+        Functions.set("arrayValues ", new std_arrayValues());
     }
 }