Question

Possible Duplicate:
What are the rules for Javascript's automatic semicolon insertion?

I know you can chain js (or jquery) on differnt lines like so:

$('div')
    .filter(':first').hide().end()
    .find('span').css('opacity', .5)
    ...;

And the engine doesn’t put semicolons in which would break it. On the other hand if I do this:

return
    i ? 1 : 2

It puts a semicolon in and always return undefined. What are the guidelines for when it does what?

Answer 1

In your first example, the subsequent lines are invalid syntax when used alone.

In your second example, the second line is a valid (though useless) statement.

For more precise rules, see the spec, which goes on for three pages.