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Q&A Terms for types of functions with respect to side effects

I know that 1 is sometimes called a pure function - although apparently a pure function must also not vary when the input is constant. By negation, the other kind are called impure functions, alth...

posted 1y ago by matthewsnyder‭  ·  edited 1y ago by matthewsnyder‭

Answer
#2: Post edited by user avatar matthewsnyder‭ · 2023-08-09T20:56:35Z (over 1 year ago)
  • I know that 1 is sometimes called a *pure function* - although [apparently](https://en.wikipedia.org/wiki/Pure_function) a pure function must also not vary when the input is constant.
  • By negation, the other kind are called *impure functions*, although this seems to me biased towards the idea that side effects are bad.
  • I've seen [*procedure*](https://stackoverflow.com/q/721090/21703684) used for 4, but it seems to be used inconsistently and sometimes gets conflated with 3 and even 2 depending on the language.
  • 5 is sometimes called a *trivial* or *dummy* function.
  • I know that 1 is sometimes called a *pure function* - although [apparently](https://en.wikipedia.org/wiki/Pure_function) a pure function must also not vary when the input is constant.
  • By negation, the other kind are called *impure functions*, although this seems to me biased towards the idea that side effects are bad.
  • I've seen [*procedure*](https://stackoverflow.com/q/721090/21703684) used for 4, but it seems to be used inconsistently and sometimes gets conflated with 3 and even 2 depending on the language.
  • 5 is sometimes called a *trivial* or *dummy* function. *Null function* or *no-op* are also used.
#1: Initial revision by user avatar matthewsnyder‭ · 2023-08-09T20:49:55Z (over 1 year ago)
I know that 1 is sometimes called a *pure function* - although [apparently](https://en.wikipedia.org/wiki/Pure_function) a pure function must also not vary when the input is constant.

By negation, the other kind are called *impure functions*, although this seems to me biased towards the idea that side effects are bad.

I've seen [*procedure*](https://stackoverflow.com/q/721090/21703684) used for 4, but it seems to be used inconsistently and sometimes gets conflated with 3 and even 2 depending on the language.

5 is sometimes called a *trivial* or *dummy* function.