I know HOP.
It depresses me how much of HOP is irrelevant in Python because they have proper iterators. And how few Perl programmers realize that these days the lack is a major omission in the language.
It depresses me how much of HOP is irrelevant in Python because they have proper iterators. And how few Perl programmers realize that these days the lack is a major omission in the language.
Are there any particular resources you would recommend for someone like me to get going quickly with python? In particular ones that specifically address the type of blind spot you mention?
The iterator section is http://docs.python.org/2/tutorial/classes.html#iterators. Here it is quickly. Suppose that an object has a __iter__ method which will return something with a next method that will, when it has exhausted the iterator, call StopIteration. Then all native looping constructs can loop over that object and it will just work.
If you call a function that internally calls yield and nowhere calls return, then you get back a generator, which is an object with those methods.
There is also syntax to construct such generators inline without even an explicit function.
All of the closure based looping stuff in HOP which supports potentially infinite streams? It is all built in!
https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guid...
sub new_iter {
my $i = 0;
return sub {$i++}
}
my $iter = new_iter();
while(my $number = $iter->()) {
say $number;
}
Re: Underscore... there is a Perl port - http://vti.github.io/underscore-perl/