gocurcon: Google Currency Converter Scrapper

[conan]

Hi all,



I wanted to share a tiny script which allows me to query google/finance/converter from the CLI.



It's not much of a scrapper really, but I couldn't come up with a better word to describe it. It does scrap! Really! :P



Check it here:

https://github.com/conan-lugmen/newlisp-webscraps">//https://github.com/conan-lugmen/newlisp-webscraps



I have two questions regarding my code:



1. Why unify requires uppercase tokens to be able to create symbols with bind? Or maybe my question is this one: Am I correctly using bind/unify? Is that the intended use?



2. I put a check to consider a get-url not giving back a proper answer. However on some runs I've noticed I get nil results like if my check was passed by. What am I doing wrong there?

[Lutz]

Using uppercase letters for variables in unification, is a convention introduced from logic programming with the Prolog language.



See also here: http://en.wikipedia.org/wiki/Unification_%28computer_science%29#Examples_of_syntactic_unification_of_first-order_terms">//http://en.wikipedia.org/wiki/Unification_(computer_science)#Examples_of_syntactic_unification_of_first-order_terms



You are using bind with unify correctly, although instead of:

Code Select Expand

(bind (unify '(From To Ammount) myArgs))
you could also use:

Code Select Expand

(map set '(From To Ammount) myArgs))
and in the last case your variables don't need to be in uppercase.

[hilti]

Thanks for this useful and small scraper.



Best wishes

Marc