Irrational Exuberance

You are writing a comment about Reading Files in Clojure, here is a quick summary:

A brief overview to approaches to reading in files in Clojure.

You are responding to this comment written by liwp on November 16th 2009, 08:08.

Something to remember in clojure is that sequences are by default lazy. So if you produce a sequence from reading a file, e.g.

(with-open ... 
  (map ...)) 

you have to wrap the sequence producing code in a doall:

(with-open ...
  (doall (map ...)))

This will make sure that all the side-effects in the sequence, i.e. reading from the file, are all realised while the file is still open.

doall is not necessary for the reduce examples, because reduce will realise the whole sequence before returning.

-- Lauri

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