[It is a philosophical question, not a practical programming problem.]
I'm used, in imperative programming languages with exceptions (like
Python) to call any function without fear of stopping the program
because I can always catch the exceptions with things like (Python):
while not over:
try:
code which may raise an exception...
except Exception e:
do something clever
How to do it in Haskell? How can I call functions like Prelude.head
while being sure my program won't stop, even if I call head on an
empty list (thus calling "error")?
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