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Functional programming is not useful for most apps

functional programming allows to express state easily
11 supporter.

Functional programming is not useful for most apps

features and principles from functional programming (e.g. first-order functions, immutability, monads) find wide application in established and new programming languages and at a higher level in system design (Google MapReduce, Twitter Finagle etc.)
5 supporter.
1 fallacy report.
Appeal To Authority

Bug-free software is possible

are you sure it's not run on a hypothetical 2-bit architecture (overflow happens then)? are you sure the plan was to compute 2+3, not something else (then the whole program is a bug)? are you sure the plan was to print the result to stdout? is it available at all? can't 'print' raise an exception?
2 supporter.