On Jan 7, 8:22 am, Casper Bang <casper.b...@gmail.com> wrote:
> ...
> We've all learned that we should avoid polluting scope with temporary
> variables and exposed state, which is why we should favor iterators
> over indexing. However, there are a great deal of times where we need
> the index either directly or indirectly when i.e. operating of
> multiple aligned structures, treating the first item specially, or the
> last, etc.
>...
Well, there is this trick invented by someone at the Technion, I
think.
public class Separator {
private final String sep;
private String curSep = "";
public Separator(final String sep) {
this.sep = sep;
}
public String toString() {
String out = curSep;
curSep = sep;
return out;
}
}
---
String join (Iterable<String> iterable, String sep) {
Separator separator = new Separator(sep);
StringBuilder b = new StringBuilder();
for (String s: iterable) {
b.append(separator).append(s);
}
return b.toString();
}
---
The exercise is to extend this idea to one for more
general handling of the first element.
Respectfully,
Eric Jablow
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