+ operator explanation

[jimfog]

I am trying to make a firefox extension using the mozilla APIs.Here is a a piece of code that i can understand where the + operator is useful to exactly:

var item = contextMenu.Item({ label: "xxxxxxxxx", context: contextMenu.SelectionContext(), contentScript: 'on("click", function () {'+'alert("Item clicked!");'+'});'});

I am trying to make a context menu appear upon selection of a text from a webpage.I do understand the code in general, but i cannot understand what the + operator is doing there.From what i know + is used to add numbers and to join strings.So what is doing there? Explanations(as always) are welcome.Thanks.

[justsomeguy]

In that particular example, there's no reason for it to be there. Might as well just do this:contentScript: 'on("click", function () {alert("Item clicked!");});'You might see people using that if the string goes across several lines:

contentScript: 'on("click", function () {' +				'alert("Item clicked!");' +				'});'

[ShadowMage]

From what i know + is used to add numbers and to join strings.

And that's exactly what it's doing:contentScript: 'on("click", function () {' + 'alert("Item clicked!");' + '});'EDIT:...But like JSG said, in this case it really serves no purpose.

[jimfog]

You were right, thanks.