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src/main/java/dk/madsravn/interpreter/ast/ArrayLiteral.java

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+package dk.madsravn.interpreter.ast;
+
+import dk.madsravn.interpreter.tokens.Token;
+
+import java.lang.reflect.Array;
+import java.util.List;
+import java.util.stream.Collectors;
+
+public class ArrayLiteral implements IExpression {
+    private Token token;
+    private List<IExpression> elements;
+
+    public ArrayLiteral(Token token, List<IExpression> elements) {
+        this.token = token;
+        this.elements = elements;
+    }
+
+    public int getElementsLength() {
+        return elements.size();
+    }
+
+    public List<IExpression> getElements() {
+        return elements;
+    }
+
+    @Override
+    public void expressionNode() {}
+
+    @Override
+    public String tokenLiteral() {
+        return token.getLiteral();
+    }
+
+    @Override
+    public String string() {
+
+        String elementsString = elements.stream().map(p -> p.string()).collect(Collectors.joining(", "));
+        StringBuilder sb = new StringBuilder();
+        sb.append("[");
+        sb.append(elementsString);
+        sb.append("]");
+
+        return sb.toString();
+    }
+
+}

src/main/java/dk/madsravn/interpreter/ast/HashLiteral.java

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+package dk.madsravn.interpreter.ast;
+
+import dk.madsravn.interpreter.tokens.Token;
+
+import java.util.Map;
+import java.util.stream.Collectors;
+
+public class HashLiteral implements IExpression {
+
+    private Token token;
+    private Map<IExpression, IExpression> pairs;
+
+    public HashLiteral(Token token, Map<IExpression, IExpression> pairs) {
+        this.token = token;
+        this.pairs = pairs;
+    }
+
+    public Map<IExpression, IExpression> getPairs() {
+        return pairs;
+    }
+
+    public int getPairsLength() {
+        return pairs.size();
+    }
+
+    @Override
+    public void expressionNode() { }
+
+    @Override
+    public String tokenLiteral() {
+        return token.getLiteral();
+    }
+
+    @Override
+    public String string() {
+        StringBuilder sb = new StringBuilder();
+        String content = pairs.entrySet().stream().map(e -> e.getKey().string() + ": " + e.getValue().string()).collect(Collectors.joining(", "));
+        sb.append("{");
+        sb.append(content);
+        sb.append("}");
+
+        return sb.toString();
+    }
+}

src/main/java/dk/madsravn/interpreter/ast/IndexExpression.java

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+package dk.madsravn.interpreter.ast;
+
+import dk.madsravn.interpreter.tokens.Token;
+
+public class IndexExpression implements IExpression {
+    private Token token;
+    private IExpression left;
+    private IExpression index;
+
+    public IndexExpression(Token token, IExpression left, IExpression index) {
+        this.token = token;
+        this.left = left;
+        this.index = index;
+    }
+
+    public IExpression getLeft() {
+        return left;
+    }
+
+    public IExpression getIndex() {
+        return index;
+    }
+
+    @Override
+    public void expressionNode() {  }
+
+    @Override
+    public String tokenLiteral() {
+        return token.getLiteral();
+    }
+
+    @Override
+    public String string() {
+        StringBuilder sb = new StringBuilder();
+        sb.append("(");
+        sb.append(left.string());
+        sb.append("[");
+        sb.append(index.string());
+        sb.append("])");
+
+        return sb.toString();
+    }
+}