Practical use of curried functions?

Question

There are tons of tutorials on how to curry functions, and as many questions here at stackoverflow. However, after reading The Little Schemer, several books, tutorials, blog

Answer 1

In and of itself currying is syntactic sugar. Syntactic sugar is all about what you want to make easy. C for example wants to make instructions that are "cheap" in assembly language like incrementing, easy and so they have syntactic sugar for incrementation, the ++ notation.

 t = x + y
 x = x + 1

is replaced by t = x++ + y

Functional languages could just as easily have stuff like.

f(x,y,z) = abc 
g(r,s)(z) = f(r,s,z). 
h(r)(s)(z) = f(r,s,z)

but instead its all automatic. And that allows for a g bound by a particular r0, s0 (i.e. specific values) to be passed as a one variable function.

Take for example perl's sort function which takes sort sub list where sub is a function of two variables that evaluates to a boolean and list is an arbitrary list.

You would naturally want to use comparison operators (<=>) in Perl and have sortordinal = sort (<=>) where sortordinal works on lists. To do this you would sort to be a curried function.
And in fact sort of a list is defined in precisely this way in Perl.

In short: currying is sugar to make first class functions more natural.