From 5ff2f8be5aa459f0a7365e63d633e9976c6ed926 Mon Sep 17 00:00:00 2001
From: Tom Willemse
Date: Wed, 11 Nov 2020 21:53:12 -0800
Subject: Support converting operands to strings for the + operator

---
 src/com/craftinginterpreters/lox/Interpreter.java | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/src/com/craftinginterpreters/lox/Interpreter.java b/src/com/craftinginterpreters/lox/Interpreter.java
index 24cf1c0..57e697c 100644
--- a/src/com/craftinginterpreters/lox/Interpreter.java
+++ b/src/com/craftinginterpreters/lox/Interpreter.java
@@ -110,6 +110,14 @@ class Interpreter implements Expr.Visitor<Object> {
                     return (String) left + (String) right;
                 }
 
+                if (left instanceof String) {
+                    return (String) left + stringify(right);
+                }
+
+                if (right instanceof String) {
+                    return stringify(left) + (String) right;
+                }
+
                 throw new RuntimeError(expr.operator, "Operands must be two numbers or two strings.");
             case SLASH:
                 checkNumberOperands(expr.operator, left, right);
-- 
cgit v1.2.3-54-g00ecf