Undefined values: Difference between revisions

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@@ Line 40: / Line 40: @@
 =={{header|JavaScript}}==
-<lang javascript>
+<lang javascript>var a;
-var a
-typeof(a) == "undefined"
+typeof(a) == "undefined";
-typeof(b) == "undefined"
+typeof(b) == "undefined";
+var obj = {}; // Empty object.
-{}.c == null
+obj.c == null;
-</lang>
+obj.c = 42;
+obj.c == 42;
+delete obj.c;
+obj.c == null;</lang>
 =={{header|Oz}}==