> From: [email protected]
> Date: Fri, 12 Sep 2014 16:29:41 +0400
> To: [email protected]
> CC: [email protected]
> Subject: Re: [rust-dev] String capitalization
>
> Hi, Ollie,
>
> This variant is terser, but it could be even more readable if there were some
> kind of connect() for iterators. It surprised me that there is no such thing
> in Rust iterators. It would be possible to use some kind of interleave() for
> iterators for the same purpose, but there is no such thing as well. Hence I
> had to use fold() and then pop_char() which is rather nasty as it breaks
> method chain.
>
> On the other hand, this variant performs less allocations than your original
> version because the resulting string is allocated in advance.
This is what I tried to do as well. I think you can just check if r is empty
and only append a space to it if it's not before appending w.
Note, I don't think either one is very readable.
> use std::char;
>
> fn name_from_file(file: String) -> String {
> let mut r = file.as_slice().split('-')
> .map(|w|
> char::to_uppercase(w.char_at(0)).to_string().append(w.slice_chars(1,
> w.len())))
> .fold(
> String::with_capacity(file.len()+1),
> |r, w| r.append(w.as_slice()).append(" ")
> );
> r.pop_char();
> r
> }
>
> fn main() {
> let hypenated_string = "hello-there".to_string();
> let capitalized_string = name_from_file(hypenated_string);
> println!("{}", capitalized_string);
> }
>
> See it in action here: http://is.gd/UKKB96
>
> BTW, I suggest you to use Stackoverflow [1] (preferred) or Reddit [2] to ask
> questions like this. The active community there is much larger than here, so
> you can get an answer quicker.
>
> [1]: http://stackoverflow.com/questions/tagged/rust
> [2]: http://www.reddit.com/r/rust/
>
>
> On 12 сент. 2014 г., at 15:35, Oldřich Vetešník <[email protected]>
> wrote:
>
> > Hello,
> >
> > this is probably going to sound silly, but can this be written better?
> > I’d like to turn “hello-there” into “Hello There”.
> > I was thinking about something along the lines of split -> map ->
> > capitalize -> join but the capitalization seems kind of awful to me.
> >
> > use std::char;
> >
> > fn name_from_file(file: String) -> String {
> > let mut words: Vec<&str> = file.as_slice().split('-').collect();
> > let mut cap_words = Vec::new();
> >
> > for word in words.mut_iter() {
> > let first = char::to_uppercase(word.char_at(0)).to_string();
> > let rest = word.slice_chars(1, word.len());
> >
> > let cap_word = first.append(rest);
> > cap_words.push(cap_word);
> > }
> >
> > cap_words.connect(" ")
> > }
> >
> > fn main() {
> > let hypenated_string = "hello-there".to_string();
> > let capitalized_string = name_from_file(hypenated_string);
> > println!("{}", capitalized_string);
> > }
> >
> >
> > Thanks,
> > Ollie
> > _______________________________________________
> > Rust-dev mailing list
> > [email protected]
> > https://mail.mozilla.org/listinfo/rust-dev
>
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