Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]

Groups > comp.lang.java.programmer > #2607

Re: Refactoring discovery

Show all headers | View raw

On 26/03/2011 3:43 PM, Stefan Ram wrote:
> Joshua Cranmer<Pidgeot18@verizon.invalid>  writes:
>> But mathematical functions return only one value;
>
>    In mathematics, there is no clear-drawn distinction between
>    »one value« and »multiple values«. For example, one
>    says that f, defined as f(x,y):=x+y, is a function of
>    »two arguments«, yet one usually gives »f: R × R ->  R«,
>    which literally means: it is a function of /one/ argument,
>    which happens to be a pair. And of course, one can have
>    functions ... ->  R x R.
>

And out of left field comes currying and/or closures:
    g: x -> (y -> z)
where (f(x))(y) = g(x,y).  But it's sometimes annoying that leaving 
unbound the "second argument" of what you though of as a 2-argument 
function is privileged over leaving the 1st argument unbound.

Back to comp.lang.java.programmer | Previous | Next | Find similar

Thread

Re: Refactoring discovery David Lamb <dalamb@cs.queensu.ca> - 2011-03-30 16:15 -0400

csiph-web