`event is: ${event}` is equal to "event is: " + event
It's called string template or string interpolation and it is part of
EcmaScript 2015 (ore ES6).
You can find a quick overview here: https://github.com/lukehoban/es6features
bye
On Wed, May 18, 2016 at 5:42 AM, <[email protected]> wrote:
> Hello;
> I have been doing browser javascript since 2003. I have also been doing
> php on the serverside. But I have become very interested in exploring
> node.js.
>
> In the documentation on the Node.js site I see example code with
> constructs I am not familiar with:
>
> sample 1 syntax
> fs.unlink('/tmp/hello', (err) => {
> if (err) throw err;
> console.log('successfully deleted /tmp/hello');
> });
>
> I am unfamiliare with "(err) =>". I have not seen this in javascript before
>
> then there is:
>
> sample 2 syntax
> fs.watch('somedir', (event, filename) => {
> console.log(`event is: ${event}`);
> if (filename) {
> console.log(`filename provided: ${filename}`);
> } else {
> console.log('filename not provided');
> }
> });
>
> I am unfamiliar with this construct: "${event}".
> I have seen this in php as variable variable references.
> But this is not php. I was of the understanding that $ is
> a valid and non special chararcter that can be used as
> and identifier (although it shows up as the reference to
> matches return from regex function)
>
> Is there some published documentation that would clarify
> and explain these constructs for me?
>
> Thank you for time and attention.
>
> PS I have successfully set up an http server with some elaborations based
> on
> instructions from the Apress publication 'Beginning Node.js'
>
> My set up services background requests of external css source files, image
> files
> designated for background rules, and external javascript files. But I am
> uncertain
> how an actuall "ajax" xmlHttpRequest object request would be handled from
> the
> server's standpoint.
>
> Thanks anew
>
> JK
>
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