Haskell
The fact that Haskell is included in this listing of languages indicates how important the functional paradigm is to this book. Haskell is a purely functional language designed by committee and released in 1998. It has several fascinating features, most notably lazy evaluation, whereby the value of a given piece of data does not need to be known (or even meaningful) until it needs to be used. This allows a programmer to define things in terms of infinite series, such as the set of all integers.
Haskell is the language used for Pugs, an implementation of the new Perl 6 language, which some people think is drawing more attention to Haskell than to Perl itself. Haskell has an interactive environment similar to Ruby’s irb, but it doesn’t allow ...
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