diff --git a/src/main/java/carpet/script/Expression.java b/src/main/java/carpet/script/Expression.java
index 6b4f22b6..fe4fafab 100644
--- a/src/main/java/carpet/script/Expression.java
+++ b/src/main/java/carpet/script/Expression.java
@@ -13,10 +13,12 @@ import carpet.script.Fluff.TriFunction;
 import carpet.script.exception.ExpressionException;
 import carpet.script.exception.InternalExpressionException;
 import carpet.script.value.AbstractListValue;
+import carpet.script.value.ContainerValueInterface;
 import carpet.script.value.FunctionSignatureValue;
 import carpet.script.value.GlobalValue;
 import carpet.script.value.LazyListValue;
 import carpet.script.value.ListValue;
+import carpet.script.value.MapValue;
 import carpet.script.value.NumericValue;
 import carpet.script.value.StringValue;
 import carpet.script.value.Value;
@@ -1227,7 +1229,12 @@ public class Expression implements Cloneable
      */
     public void Operators()
     {
-        addBinaryOperator(".", precedence.get("attribute~."),true, Value::getElementAt);
+        addBinaryOperator(".", precedence.get("attribute~."),true, (container, key) ->
+        {
+            if (container instanceof ContainerValueInterface)
+                return ((ContainerValueInterface) container).get(key);
+            throw new InternalExpressionException("Cannot access elements of a non-container");
+        });
         addBinaryOperator("+", precedence.get("addition+-"), true, Value::add);
         addBinaryOperator("-", precedence.get("addition+-"), true, Value::subtract);
         addBinaryOperator("*", precedence.get("multiplication*/%"), true, Value::multiply);
@@ -1322,7 +1329,7 @@ public class Expression implements Cloneable
             v1.assertAssignable();
             String varname = v1.getVariable();
             LazyValue boundedLHS;
-            if (v1 instanceof ListValue)
+            if (v1 instanceof ListValue || v1 instanceof MapValue)
             {
                 ((ListValue) v1).append(v2);
                 boundedLHS = (cc, tt)-> v1;
@@ -1872,7 +1879,46 @@ public class Expression implements Cloneable
             return LazyListValue.range(from, to, step);
         });
 
-        addBinaryFunction("get", Value::getElementAt);
+        addFunction("m", lv ->
+        {
+            if (lv.size() == 1 && lv.get(0) instanceof LazyListValue)
+                return new MapValue(((LazyListValue) lv.get(0)).unroll());
+            return new MapValue(lv);
+        });
+
+        addUnaryFunction("keys", v -> {
+            if (v instanceof MapValue)
+                return new ListValue(((MapValue) v).getMap().keySet());
+            throw new InternalExpressionException("keys applies only to maps");
+        });
+
+        addUnaryFunction("values", v -> {
+            if (v instanceof MapValue)
+                return new ListValue(((MapValue) v).getMap().values());
+            throw new InternalExpressionException("keys applies only to maps");
+        });
+
+        addUnaryFunction("pairs", v -> {
+            if (v instanceof MapValue)
+                return new ListValue(((MapValue) v).getMap().entrySet().stream().map(
+                        (p) -> ListValue.of(p.getKey(), p.getValue())
+                        ).collect(Collectors.toList()));
+            throw new InternalExpressionException("pairs applies only to maps");
+        });
+
+        addBinaryFunction("get", (container, key) ->
+        {
+            if (container instanceof ContainerValueInterface)
+                return ((ContainerValueInterface) container).get(key);
+            throw new InternalExpressionException("Cannot access elements of a non-container");
+        });
+
+        addBinaryFunction("has", (container, key) ->
+        {
+            if (container instanceof ContainerValueInterface)
+                return new NumericValue(((ContainerValueInterface) container).has(key));
+            throw new InternalExpressionException("Cannot access elements of a non-container");
+        });
 
         //Deprecated, use "get" instead
         addBinaryFunction("element", (v1, v2) ->
@@ -1892,27 +1938,36 @@ public class Expression implements Cloneable
         {
             if(lv.size()<3)
             {
-                throw new InternalExpressionException("put takes at least three arguments, a list, index, and values to insert at that index");
+                throw new InternalExpressionException("put takes at least three arguments, a container, address, and values to insert at that index");
             }
-            Value list = lv.get(0);
-            if (!(list instanceof ListValue))
+            Value container = lv.get(0);
+            if (!(container instanceof ContainerValueInterface))
             {
-                throw new InternalExpressionException("First argument of element should be a list");
+                throw new InternalExpressionException("First argument of put should be a container: list, map or nbt");
             }
-            int size = lv.size();
-            //List<Value> items = ((ListValue)lv.get(0)).getItems();
-            Value index = lv.get(1);
-            if (index == Value.NULL)
+            Value where = lv.get(1);
+            Value what = lv.get(2);
+            Value ret;
+            if (lv.size()>3)
             {
-                ((ListValue) list).extend(lv.subList(2,size));
+                return ((ContainerValueInterface) container).put(where, what, lv.get(3));
             }
             else
             {
-                ((ListValue) list).addAtIndex((int) NumericValue.asNumber(index).getLong(), lv.subList(2,size));
+                return ((ContainerValueInterface) container).put(where, what);
             }
-            return new NumericValue(size-2);
         });
 
+        addBinaryFunction("delete", (container, address) ->
+        {
+            if (container instanceof ContainerValueInterface)
+            {
+                return ((ContainerValueInterface) container).remove(address);
+            }
+            throw new InternalExpressionException("First argument of remove should be a container: list, map or nbt");
+        });
+
+
         //condition and expression will get a bound 'i'
         //returns last successful expression or false
                 // while(cond, limit, expr) => ??
diff --git a/src/main/java/carpet/script/value/AbstractListValue.java b/src/main/java/carpet/script/value/AbstractListValue.java
index f7e33a02..f72ffd59 100644
--- a/src/main/java/carpet/script/value/AbstractListValue.java
+++ b/src/main/java/carpet/script/value/AbstractListValue.java
@@ -1,9 +1,15 @@
 package carpet.script.value;
 
+import carpet.script.exception.InternalExpressionException;
+
 import java.util.Iterator;
 
 public abstract class AbstractListValue extends Value
 {
     public abstract Iterator<Value> iterator();
     public void fatality() { }
+    public void append(Value v)
+    {
+        throw new InternalExpressionException("Cannot append a value to abstract list");
+    }
 }
diff --git a/src/main/java/carpet/script/value/ContainerValueInterface.java b/src/main/java/carpet/script/value/ContainerValueInterface.java
new file mode 100644
index 00000000..09e54b28
--- /dev/null
+++ b/src/main/java/carpet/script/value/ContainerValueInterface.java
@@ -0,0 +1,13 @@
+package carpet.script.value;
+
+public interface ContainerValueInterface
+{
+    public Value put(Value where, Value value);
+    default Value put(Value where, Value value, Value conditions)
+    {
+        return put(where, value);
+    }
+    public Value get(Value where);
+    public boolean has(Value where);
+    public Value remove(Value where);
+}
diff --git a/src/main/java/carpet/script/value/LazyListValue.java b/src/main/java/carpet/script/value/LazyListValue.java
index e34a83e7..5035c018 100644
--- a/src/main/java/carpet/script/value/LazyListValue.java
+++ b/src/main/java/carpet/script/value/LazyListValue.java
@@ -126,11 +126,6 @@ public abstract class LazyListValue extends AbstractListValue implements Iterato
         return false;
     }
 
-    @Override
-    public Value getElementAt(Value v2)
-    {
-        throw new InternalExpressionException("get element can only be obtained for regular lists");
-    }
     @Override
     public String getTypeString()
     {
diff --git a/src/main/java/carpet/script/value/ListValue.java b/src/main/java/carpet/script/value/ListValue.java
index d24cd39c..a875e519 100644
--- a/src/main/java/carpet/script/value/ListValue.java
+++ b/src/main/java/carpet/script/value/ListValue.java
@@ -9,7 +9,7 @@ import java.util.stream.Collectors;
 
 import static java.lang.Math.abs;
 
-public class ListValue extends AbstractListValue
+public class ListValue extends AbstractListValue implements ContainerValueInterface
 {
     protected List<Value> items;
     @Override
@@ -98,6 +98,7 @@ public class ListValue extends AbstractListValue
         }
         return output;
     }
+    @Override
     public void append(Value v)
     {
         items.add(v);
@@ -271,6 +272,8 @@ public class ListValue extends AbstractListValue
             super(list);
         }
     }
+
+    @Override
     public int length()
     {
         return items.size();
@@ -309,7 +312,30 @@ public class ListValue extends AbstractListValue
     }
 
     @Override
-    public Value getElementAt(Value value)
+    public Value put(Value ind, Value value)
+    {
+        if (ind == Value.NULL)
+        {
+            items.add(value);
+            return items.get(items.size()-1);
+        }
+        else
+        {
+            int numitems = items.size();
+            int index = (int) NumericValue.asNumber(ind).getLong();
+            if (index < 0)
+            {
+                long range = abs(index) / numitems;
+                index += (range + 2) * numitems;
+                index = index % numitems;
+            }
+            while (index >= items.size()) items.add(Value.NULL);
+            return items.set(index, value);
+        }
+    }
+
+    @Override
+    public Value get(Value value)
     {
         long index = NumericValue.asNumber(value).getLong();
         int numitems = items.size();
@@ -319,6 +345,24 @@ public class ListValue extends AbstractListValue
         return items.get((int)index);
     }
 
+    @Override
+    public boolean has(Value where)
+    {
+        long index = NumericValue.asNumber(where).getLong();
+        return index >= 0 && index < items.size();
+    }
+
+    @Override
+    public Value remove(Value where)
+    {
+        long index = NumericValue.asNumber(where).getLong();
+        int numitems = items.size();
+        long range = abs(index)/numitems;
+        index += (range+2)*numitems;
+        index = index % numitems;
+        return items.remove((int)index);
+    }
+
     @Override
     public String getTypeString()
     {
diff --git a/src/main/java/carpet/script/value/MapValue.java b/src/main/java/carpet/script/value/MapValue.java
index 57610d09..adc6ffb7 100644
--- a/src/main/java/carpet/script/value/MapValue.java
+++ b/src/main/java/carpet/script/value/MapValue.java
@@ -1,18 +1,32 @@
 package carpet.script.value;
 
-import java.util.Arrays;
+import carpet.script.exception.InternalExpressionException;
+
+import java.util.ArrayList;
 import java.util.HashMap;
 import java.util.Iterator;
+import java.util.List;
 import java.util.Map;
+import java.util.stream.Collectors;
 
-public class MapValue extends AbstractListValue
+public class MapValue extends AbstractListValue implements ContainerValueInterface
 {
     private Map<Value, Value> map;
-    public MapValue()
+
+    private MapValue()
     {
         map = new HashMap<>();
     }
 
+    public MapValue(List<Value> kvPairs)
+    {
+        this();
+        for (Value v : kvPairs)
+        {
+            put(v);
+        }
+    }
+
     @Override
     public Iterator<Value> iterator()
     {
@@ -22,7 +36,20 @@ public class MapValue extends AbstractListValue
     @Override
     public String getString()
     {
-        return Arrays.toString(map.entrySet().toArray());
+        return "{"+map.entrySet().stream().map((p) -> p.getKey().getString()+": "+p.getValue().getString()).collect(Collectors.joining(", "))+"}";
+    }
+
+    @Override
+    public String getPrettyString()
+    {
+        if (map.size()<6)
+            return "{"+map.entrySet().stream().map((p) -> p.getKey().getPrettyString()+": "+p.getValue().getPrettyString()).collect(Collectors.joining(", "))+"}";
+        List<Value> keys = new ArrayList<>(map.keySet());
+        int max = keys.size();
+        return "{"+keys.get(0).getPrettyString()+": "+map.get(keys.get(0)).getPrettyString()+", "+
+                keys.get(1).getPrettyString()+": "+map.get(keys.get(1)).getPrettyString()+", ..., "+
+                keys.get(max-2).getPrettyString()+": "+map.get(keys.get(max-2)).getPrettyString()+", "+
+                keys.get(max-1).getPrettyString()+": "+map.get(keys.get(max-1)).getPrettyString()+"}";
     }
 
     @Override
@@ -31,4 +58,150 @@ public class MapValue extends AbstractListValue
         return !map.isEmpty();
     }
 
+    @Override
+    public Value clone()
+    {
+        return new MapValue(map);
+    }
+    public MapValue(Map<Value,Value> other)
+    {
+        map = new HashMap<>(other);
+    }
+
+    @Override
+    public Value add(Value o)
+    {
+        throw new InternalExpressionException("cannot add to a map value");
+    }
+
+    @Override
+    public Value subtract(Value v)
+    {
+        throw new InternalExpressionException("cannot subtract to a map value");
+    }
+
+    @Override
+    public Value multiply(Value v)
+    {
+        throw new InternalExpressionException("cannot multiply to a map value");
+    }
+
+    @Override
+    public Value divide(Value v)
+    {
+        throw new InternalExpressionException("cannot divide to a map value");
+    }
+
+    public void put(Value v)
+    {
+        if (!(v instanceof ListValue))
+        {
+            map.put(v, Value.NULL);
+            return;
+        }
+        ListValue pair = (ListValue)v;
+        if (pair.getItems().size() != 2)
+        {
+            throw new InternalExpressionException("map constructor requires elements that have two elements");
+        }
+        map.put(pair.getItems().get(0), pair.getItems().get(1));
+    }
+
+    @Override
+    public void append(Value v)
+    {
+        put(v);
+    }
+
+    @Override
+    public int compareTo(Value o)
+    {
+        throw new InternalExpressionException("cannot compare to a map value");
+    }
+
+    @Override
+    public boolean equals(final Value o)
+    {
+        if (o instanceof MapValue)
+        {
+            MapValue ol = (MapValue)o;
+            int this_size = this.map.keySet().size();
+            int o_size = ol.map.keySet().size();
+            if (this_size != o_size) return false;
+            if (this_size == 0) return true;
+            return this.map.keySet().equals(ol.map.keySet());
+        }
+        return false;
+    }
+
+    public Map<Value, Value> getMap()
+    {
+        return map;
+    }
+
+    public void extend(List<Value> subList)
+    {
+        for (Value v: subList) put(v);
+    }
+
+    @Override
+    public int length()
+    {
+        return map.size();
+    }
+
+    @Override
+    public Value in(Value value1)
+    {
+        if (map.containsKey(value1)) return value1;
+        return Value.NULL;
+    }
+
+    @Override
+    public Value slice(long from, long to)
+    {
+        throw new InternalExpressionException("cannot slice a map value");
+    }
+
+    @Override
+    public double readNumber()
+    {
+        return (double)map.size();
+    }
+
+    @Override
+    public Value get(Value v2)
+    {
+        return map.getOrDefault(v2, Value.NULL);
+    }
+
+    @Override
+    public boolean has(Value where)
+    {
+        return map.containsKey(where);
+    }
+
+    @Override
+    public Value remove(Value where)
+    {
+        return map.remove(where);
+    }
+
+    @Override
+    public Value put(Value key, Value value)
+    {
+        return map.put(key, value);
+    }
+
+    @Override
+    public String getTypeString()
+    {
+        return "map";
+    }
+
+    @Override
+    public int hashCode()
+    {
+        return map.hashCode();
+    }
 }
diff --git a/src/main/java/carpet/script/value/NBTSerializableValue.java b/src/main/java/carpet/script/value/NBTSerializableValue.java
index efb616ee..65eddd74 100644
--- a/src/main/java/carpet/script/value/NBTSerializableValue.java
+++ b/src/main/java/carpet/script/value/NBTSerializableValue.java
@@ -3,6 +3,7 @@ package carpet.script.value;
 import carpet.script.CarpetContext;
 import carpet.script.LazyValue;
 import carpet.script.exception.InternalExpressionException;
+import carpet.settings.CarpetSettings;
 import com.mojang.brigadier.StringReader;
 import com.mojang.brigadier.exceptions.CommandSyntaxException;
 import net.minecraft.block.entity.HopperBlockEntity;
@@ -20,17 +21,18 @@ import net.minecraft.nbt.StringNbtReader;
 import net.minecraft.nbt.Tag;
 import net.minecraft.util.math.BlockPos;
 
+import java.util.Collection;
 import java.util.HashMap;
 import java.util.List;
 import java.util.Map;
 import java.util.function.Supplier;
 import java.util.stream.Collectors;
 
-public class NBTSerializableValue extends Value
+public class NBTSerializableValue extends Value implements ContainerValueInterface
 {
     private String nbtString = null;
     private Tag nbtTag = null;
-    private Supplier<CompoundTag> nbtSupplier = null;
+    private Supplier<Tag> nbtSupplier = null;
 
     public NBTSerializableValue(ItemStack stack)
     {
@@ -43,7 +45,7 @@ public class NBTSerializableValue extends Value
         {
             try
             {
-                return (new StringNbtReader(new StringReader(nbtString))).parseCompoundTag();
+                return (new StringNbtReader(new StringReader(nbtString))).parseTag();
             }
             catch (CommandSyntaxException e)
             {
@@ -207,6 +209,82 @@ public class NBTSerializableValue extends Value
         }
     }
 
+    @Override
+    public Value put(Value where, Value value)
+    {
+        /// WIP
+
+        NbtPathArgumentType.NbtPath path = cachePath(where.getString());
+        Tag tagToInsert = value instanceof NBTSerializableValue ?
+            ((NBTSerializableValue) value).getTag() :
+            new NBTSerializableValue(value.getString()).getTag();
+        CarpetSettings.LOG.error("Inserting tag of class: "+tagToInsert.getClass().getSimpleName());
+
+        Tag tag = getTag().copy();
+        try
+        {
+            Collection<Tag> collection_1 = path.get(tag); //, CompoundTag::new);
+            for(Tag t: collection_1)
+            {
+                ((CompoundTag)t).copyFrom((CompoundTag) tagToInsert);
+            }
+            if (collection_1.size() > 0)
+            {
+                nbtSupplier = () -> tag;
+                nbtTag = tag;
+            }
+            return this;
+        }
+        catch (CommandSyntaxException e)
+        {
+            return Value.NULL;
+        }
+    }
+
+    @Override
+    public Value put(Value where, Value value, Value conditions)
+    {
+        throw new InternalExpressionException("not implemented");
+    }
+
+    @Override
+    public Value get(Value value)
+    {
+        NbtPathArgumentType.NbtPath path = cachePath(value.getString());
+        try
+        {
+            List<Tag> tags = path.get(getTag());
+            if (tags.size()==0)
+                return Value.NULL;
+            if (tags.size()==1)
+                return NBTSerializableValue.decodeTag(tags.get(0));
+            return ListValue.wrap(tags.stream().map(NBTSerializableValue::decodeTag).collect(Collectors.toList()));
+        }
+        catch (CommandSyntaxException ignored) { }
+        return Value.NULL;
+    }
+
+    @Override
+    public boolean has(Value where)
+    {
+        return cachePath(where.getString()).count(getTag()) > 0;
+    }
+
+    @Override
+    public Value remove(Value where)
+    {
+        NbtPathArgumentType.NbtPath path = cachePath(where.getString());
+        Tag tag = getTag().copy();
+        int removed = path.remove(tag);
+        if (removed > 0)
+        {
+            nbtSupplier = null;
+            nbtTag = tag;
+            return Value.TRUE;
+        }
+        return Value.FALSE;
+    }
+
     public static class InventoryLocator
     {
         public Object owner;
@@ -242,22 +320,7 @@ public class NBTSerializableValue extends Value
         return res;
     }
 
-    @Override
-    public Value getElementAt(Value value)
-    {
-        NbtPathArgumentType.NbtPath path = cachePath(value.getString());
-        try
-        {
-            List<Tag> tags = path.get(getTag());
-            if (tags.size()==0)
-                return Value.NULL;
-            if (tags.size()==1)
-                return NBTSerializableValue.decodeTag(tags.get(0));
-            return ListValue.wrap(tags.stream().map(NBTSerializableValue::decodeTag).collect(Collectors.toList()));
-        }
-        catch (CommandSyntaxException ignored) { }
-        return Value.NULL;
-    }
+
 
     @Override
     public String getTypeString()
diff --git a/src/main/java/carpet/script/value/Value.java b/src/main/java/carpet/script/value/Value.java
index c0bffde9..eda60bb7 100644
--- a/src/main/java/carpet/script/value/Value.java
+++ b/src/main/java/carpet/script/value/Value.java
@@ -173,11 +173,6 @@ public abstract class Value implements Comparable<Value>, Cloneable
         return (long)readNumber();
     }
 
-    public Value getElementAt(Value v2)
-    {
-        throw new InternalExpressionException("get element can only be obtained for lists and nbt values");
-    }
-
     public String getTypeString()
     {
         throw new InternalExpressionException("How did you get here? Cannot get type of an intenal type.");