# HG changeset patch
# User Jaroslav Tulach <jaroslav.tulach@apidesign.org>
# Date 1353165310 -3600
# Node ID f61602ea7759cdeac8b785fbb40c7cf967f15582
# Parent  2336c52d3ee54a0fe081f789eff3e8d0eb258522
Using === and !== to make sure empty string is not mistaken for null

diff -r 2336c52d3ee5 -r f61602ea7759 vm/src/main/java/org/apidesign/vm4brwsr/ByteCodeToJavaScript.java
--- a/vm/src/main/java/org/apidesign/vm4brwsr/ByteCodeToJavaScript.java	Sat Nov 17 11:21:17 2012 +0100
+++ b/vm/src/main/java/org/apidesign/vm4brwsr/ByteCodeToJavaScript.java	Sat Nov 17 16:15:10 2012 +0100
@@ -497,14 +497,14 @@
                 }
                 case opc_ifnonnull: {
                     int indx = i + readIntArg(byteCodes, i);
-                    out.append("if (stack.pop()) { gt = " + indx);
+                    out.append("if (stack.pop() !== null) { gt = " + indx);
                     out.append("; continue; }");
                     i += 2;
                     break;
                 }
                 case opc_ifnull: {
                     int indx = i + readIntArg(byteCodes, i);
-                    out.append("if (!stack.pop()) { gt = " + indx);
+                    out.append("if (stack.pop() === null) { gt = " + indx);
                     out.append("; continue; }");
                     i += 2;
                     break;
diff -r 2336c52d3ee5 -r f61602ea7759 vm/src/test/java/org/apidesign/vm4brwsr/StringSample.java
--- a/vm/src/test/java/org/apidesign/vm4brwsr/StringSample.java	Sat Nov 17 11:21:17 2012 +0100
+++ b/vm/src/test/java/org/apidesign/vm4brwsr/StringSample.java	Sat Nov 17 16:15:10 2012 +0100
@@ -43,6 +43,10 @@
         char[] arr = { a, b, c };
         return new String(arr).toString();
     }
+
+    public static String chars(char a, char b, char c) {
+        return ("" + a + b +c).toString();
+    }
     
     public static String toStringTest(int howMuch) {
         counter = 0;
diff -r 2336c52d3ee5 -r f61602ea7759 vm/src/test/java/org/apidesign/vm4brwsr/StringTest.java
--- a/vm/src/test/java/org/apidesign/vm4brwsr/StringTest.java	Sat Nov 17 11:21:17 2012 +0100
+++ b/vm/src/test/java/org/apidesign/vm4brwsr/StringTest.java	Sat Nov 17 16:15:10 2012 +0100
@@ -44,6 +44,14 @@
         );
     }
 
+    @Test public void concatChars() throws Exception {
+        assertExec(
+            "Composing yields ABC",
+            "org_apidesign_vm4brwsr_StringSample_charsLjava_lang_StringCCC",
+            "ABC", 'A', 'B', 'C'
+        );
+    }
+
     @Test(timeOut=10000) public void toStringConcatenation() throws Exception {
         assertExec(
             "Five executions should generate 5Hello World!",