feat: add native Array

com/welambdas/lambda/Interpreter.java

@@ -23,6 +23,19 @@ public Object call(Interpreter interpreter, List<Object> arguments) {
       @Override
       public String toString() { return "<native fn>"; }
     });
+    globals.define("Array", new LambdaCallable() {
+      @Override
+      public int arity() {
+        return 1;
+      }
+
+      @Override
+      public Object call(Interpreter interpreter,
+                         List<Object> arguments) {
+        int size = (int)(double)arguments.get(0);
+        return new LambdaArray(size);
+      }
+    });
   }
 
   @Override

com/welambdas/lambda/LambdaArray.java

@@ -0,0 +1,68 @@
+package com.welambdas.lambda;
+
+import java.util.List;
+
+class LambdaArray extends LambdaInstance {
+  private final Object[] elements;
+
+  LambdaArray(int size) {
+    super(null);
+    elements = new Object[size];
+  }
+
+  @Override
+  Object get(Token name) {
+    if (name.lexeme.equals("get")) {
+      return new LambdaCallable() {
+        @Override
+        public int arity() {
+          return 1;
+        }
+
+        @Override
+        public Object call(Interpreter interpreter,
+                           List<Object> arguments) {
+          int index = (int)(double)arguments.get(0);
+          return elements[index];
+        }
+      };
+    } else if (name.lexeme.equals("set")) {
+      return new LambdaCallable() {
+        @Override
+        public int arity() {
+          return 2;
+        }
+
+        @Override
+        public Object call(Interpreter interpreter,
+                           List<Object> arguments) {
+          int index = (int)(double)arguments.get(0);
+          Object value = arguments.get(1);
+          return elements[index] = value;
+        }
+      };
+    } else if (name.lexeme.equals("length")) {
+      return (double) elements.length;
+    }
+
+    throw new RuntimeError(name,
+        "Undefined property '" + name.lexeme + "'.");
+  }
+
+  @Override
+  void set(Token name, Object value) {
+    throw new RuntimeError(name, "Can't add properties to arrays.");
+  }
+
+  @Override
+  public String toString() {
+    StringBuffer buffer = new StringBuffer();
+    buffer.append("[");
+    for (int i = 0; i < elements.length; i++) {
+      if (i != 0) buffer.append(", ");
+      buffer.append(elements[i]);
+    }
+    buffer.append("]");
+    return buffer.toString();
+  }
+}

hello.orz

@@ -1,5 +1,5 @@
-#>test
+var arr = Array(3);
 
-var greeting = Greeter("srijan", "evening");
+arr.set(1, "word");
 
-greeting.greet();
+print arr.get(1);

lib/maps.orz

@@ -0,0 +1,6 @@
+class Maps {
+    init (modulo_val) {
+        this.modulo_val = modulo_val;
+    }
+    insert(number)
+}