It does precisely what you'd think. It returns the value passed in.
It's mainly used in cases where a higher-order function expects a
function, but you don't want to modify anything. See for instance
http://www.haskell.org/ghc/docs/7.0-latest/html/libraries/base-4.3.0.0/Data-Maybe.html#v:maybe
If
I've been reviewing the library, and have come unstuck with the *id*function.
What's its purpose and can someone give me an example of its practical use.
It's purpose is simply to be the identity function. The type says exactly
what it does.
Prelude :t id
id :: a - a
It's often useful in
