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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