Fixed REPL

Author: amitayh

src/forms.js

@@ -22,6 +22,7 @@ function lambda(argNames, body) {
 function define(name, expr) {
  var env = this;
  env[name] = evaluate(expr, env);
+ return null;
 }
 
 function defmacro(name, argNames, body) {

src/repl.js

@@ -1,8 +1,7 @@
 var readlineSync = require('readline-sync');
 var interpreter = require('./interpreter');
-var core = require('./core');
+var env = require('./env').getDefaultEnv();
 
-var env = core.env;
 while (true) {
  // Read
  var input = readlineSync.question('> ');
@@ -11,9 +10,8 @@ while (true) {
  var expr = JSON.parse(input);
  var result = interpreter.evaluate(expr, env);
  // Print
- console.log(result[0]);
- env = result[1];
- } catch(e) {
+ console.log(result);
+ } catch (e) {
  console.error('Error occurred', e);
  }
  // Loop! :D