Haskell function composition

Question

I am reading this tutorial on Haskell. They define function composition as the following:

(.)                     :: (b->c) -> (a->b) -> (a-         


        

Answer 1

The composition of f and g is a function that first applies g to its argument, then f to the value returned by g. It then returns the return value of f.

This identity may be enlightening:

f (g x) = (f . g) x

If you have a Java/C background, consider this example:

int f(int x);
int g(int x);
int theComposition(int x) { return f(g(x)); }