add ->string function

1 files changed, 5 insertions, 0 deletions

diff --git a/interpreter.py b/interpreter.py
index 6ad7d84..f252bc9 100644
--- a/interpreter.py
+++ b/interpreter.py
@@ -258,6 +258,11 @@ def interpretLambda(expr, env):
 
 GLOBALS.register("lambda", Builtin(interpretLambda))
 
+def interpretToString(expr, env):
+    return str(evaluate(expr.args[0], env))
+
+GLOBALS.register("->string", Builtin(interpretToString, 1))
+
 def interpretEnv(expr, env_expr, env):
     ev = evaluate(env_expr, env)
     return ev  # TODO more than this?