Interesting JavaScript code

[Pepejeria]

Check out the following page.

You will get an alert, nothing existing. But then check out the code and figure out how it is done.

Have fun!

[stef25]

yeah that is weird, some one going to explain?

[stereofrog]

nice joke

[Pepejeria]

So lets us know how the "joke" works

[stereofrog]

"public", "Class" and other "keywords" there are actually labels and can be arbitrary identifiers (or just omitted). He could have written "foo: bar: " instead of "public: Class:" with exactly the same effect.

[Ize]

Hm, my code editor marks them down as syntax errors, starting at this line:

private: message = "",

It makes sense, since Javascript object notation glues name/value pairs together with ":" instead of "=". How is it possible it still works then?

[stereofrog]

The syntax is "property: value", where "value" is any expression, including assignment. For example, this

foo = {
	bar: quux = 123
}

will create property "bar" equal to "123" and, as a side effect, assign 123 to the variable "quux".

[Pepejeria]

You rock stereofrog!

[Ize]

The syntax is "property: value", where "value" is any expression, including assignment. For example, this

foo = {
	bar: quux = 123
}

will create property "bar" equal to "123" and, as a side effect, assign 123 to the variable "quux".

Ah, that's clear, thanks