My javascript code that produces a syntax error:
var x =
{
a: 123
};
The same code without an error:
var x = {
a: 123
};
What the heck?
views:
44answers:
1
+2
A:
Javascript adds implicit ";" at the end of lines sometimes, I suppose this is what happens, and results in
var x = ;
Fabien Ménager
2010-07-04 11:17:53
For this reason, it's recommended to always use the second form.
Skilldrick
2010-07-04 11:25:00
Thanks, this is exactly what it is
Vincenzo
2010-07-04 11:35:17
it is one of the gotchas in javascript: http://stackoverflow.com/questions/3154215/what-are-the-most-common-causes-of-errors-in-javascript-and-how-to-fix-them/3154285#3154285
galambalazs
2010-07-04 11:59:39
That's not true. The variable statement is affected by the *Automatic Semicolon Insertion*, but the example that the OP posts, will *not cause any syntax error*, the `AssignmentExpression` will be evaluated *without problems*, check this question for the specific [rules of ASI](http://stackoverflow.com/questions/2846283/what-are-the-rules-for-javascripts-automatic-semicolon-insertion/) and [this example](http://jsbin.com/ukimi/edit).
CMS
2010-07-04 14:15:27
I was also surprised by the error the OP had, so what could be the problem ? Thank you CMS for the correction.
Fabien Ménager
2010-07-10 20:45:02