Saturday, June 15, 2013

Ruby - keep track of urls you've already visited

How do I keep track or urls that I've already visit in my ruby projects? Here's what I do:

def visited? url
  @visited ||= []
  return true if @visited.include? url
  @visited << url

Now I've got a visited? method that tells me if I've called it already on an url

#=> false
#=> true

That makes it easy to just do something like:

scrape(url) unless visited?(url)
This was a short post but this is something I always put in my ruby code and I'll be referencing it later.

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