Thanks for the ideas John!
I have been looking at the collection of talks, and they've been quite
helpful. Your thoughts about discussing "Java like" things makes a lot
of sense and I think contrasting Factor's object system with Java's
should be a nice topic.
That said, I did run into a question preparing the slides related to
stack-effects. I noticed that some combinators do not specify stack
effects for quotation inputs.
e.g.
dip ( x quot -- x )
keep ( ..a x quot: ( ..a x -- ..b ) -- ..b x )
Why does `dip` not need to specify the quotations stack effect, but
`keep` did? I suspect they also have something to do with the inline
word, but I'm not really sure. Could you explain?
Thanks,
Sankar
On 5/30/17 11:47 PM, John Benediktsson wrote:
We have a few "talks" that were given a number of years ago (not all
code in them is up to date, but it's mostly good -- if you have problems
updating the code let me know and I can help):
https://github.com/factor/factor/tree/master/extra/talks
https://github.com/slavapestov/boston-lisp-talk
https://github.com/slavapestov/emerging-langs-talk
You might find it interesting to discuss "Java-like" things, for
example, interfaces vs protocols:
public interface Foo {
String a();
int b();
}
public class FooImpl {
public String a() { return "hello" } ;
public int b() { return 42 } ;
}
vs a protocol (two generic methods) and a concrete class that implements
it...
GENERIC: a ( obj -- a )
GENERIC: b ( obj -- a )
TUPLE: foo ;
M: foo a "hello" ;
M: foo b 42 ;
Could also talk about ``SINGLETON:``, so instead of (plus or minus
thread safety):
public class Foo {
private static _instance = null;
public static Foo getInstance() {
if ( _instance == null ) { _instance = new Foo() };
return _instance;
}
}
vs.
SINGLETON: foo
So, touching on code generation and higher level concepts.
Maybe macros might be interesting?
Some other ideas from my blog, not sure of your audience's interest:
https://re-factor.blogspot.com/2009/08/calculating-with-ebnf.html
https://re-factor.blogspot.com/2010/11/estimating-cpu-speed.html
https://re-factor.blogspot.com/2011/02/simple-rpg.html
https://re-factor.blogspot.com/2011/04/powers-of-2.html
https://re-factor.blogspot.com/2011/04/mail-with-gui.html
https://re-factor.blogspot.com/2011/07/concatenative-thinking.html
https://re-factor.blogspot.com/2011/07/one-liners.html
https://re-factor.blogspot.com/2011/08/printf.html
https://re-factor.blogspot.com/2012/02/readability.html
https://re-factor.blogspot.com/2012/08/literate-programming.html
https://re-factor.blogspot.com/2013/10/rock-paper-scissors.html
https://re-factor.blogspot.com/2015/06/send-more-money.html
https://re-factor.blogspot.com/2017/02/711.html
Best,
John.
On Tue, May 30, 2017 at 8:14 PM, Sankaranarayanan Viswanathan
<rationalrev...@gmail.com
<mailto:rationalrev...@gmail.com>> wrote:
Hi Guys,
We have a developer community at where I work, and we do monthly
tech talks that usually last between 30 and 40 minutes. I presume
very few in that group have looked at stack based languages before,
and I've been wanting to do a small talk about Factor there.
After spending a week preparing slides, I'm having a bit of trouble
understanding what would be a meaningful scope for my talk. I really
want to touch upon a couple of aspects:
- show what stack based code looks like (i.e. avoid naming
variables most of the time)
- show that all syntax is just words, and that syntax is extensible
- show a little of the help system
- show a bit of the interactive development workflow (change,
refresh, test)
But, I'm suspecting before I even get here I might need to spend a
lot of time talking about stack-effects, combinators, and other
basics before they might get a feel for what factor code feels like.
And this I'm afraid might be a little too much to digest in a short
time. Words like dip, bi@ and sequence combinators like map seem
fundamental to work with factor, and I'm afraid a short presentation
might not be the best place to introduce these topics. But, without
them code examples are going to be hard to understand.
Any ideas?
Thanks,
Sankar
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