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Yes but also in FP perspective, a program without IO will not be ran at all. Except if you count static parameter to not be an input, then you have a static ou

by pjerem 3y ago

Yes but also in FP perspective, a program without IO will not be ran at all. Except if you count static parameter to not be an input, then you have a static output which is basically a constant. Compiler may in fact try to transform it into a constant and if you don’t do anything with it, well, it’ll probably be marked as unused and not even embedded in your binary.

blowski 3y ago
If you have a program that sends an email with fixed content to a fixed email address, whenever you run that program that email address will receive an email. Is the email an output, or a side-effect?
- kaoD 3y ago
  It is an output or, in FP terms, a side effect. But you're discussing semantics here while it's obvious side effects mean different things in different contexts so the conversation won't get very productive.
- deleted 3y ago
  [deleted]
- ninkendo 3y ago
  Sending an email absolutely involves IO.