Re: Working with string keys in a java.util.Map

[Duncan Mak <duncanmak@gmail.com>]

What do you think of having literal syntax for this -- what about $"this is
a java string"?

This is kinda inspired by what Scala did a little while again:
https://docs.scala-lang.org/overviews/core/string-interpolation.html

Looks like Gauche decided to do something similar:
https://practical-scheme.net/gauche/man/gauche-refe/Strings.html#String-interpolation

Gauche's design look quite nice:

#"This is Gauche, version ~(gauche-version)."
 ⇒ "This is Gauche, version 0.9.9."




On Fri, Jul 3, 2020 at 9:31 PM Jamison Hope <jhope@alum.mit.edu> wrote:

> In this case, I think another option is to define a wrapper function that
> specifies the argument type as String, like:
>
> (define (get attrs key::String) (attrs:get key))
>
> Then (get attrs “owner”) ought to work with the literal converted to
> java.lang.String.
>
> -J
>
> On Fri, Jul 3, 2020 at 6:33 PM Per Bothner <per@bothner.com> wrote:
>
> > On 7/3/20 2:52 PM, Sudarshan S Chawathe wrote:
> > > I've had to get Java "String"s from Kawa strings often for similar
> > > reasons when using other JVM libraries, etc., and I have just used
> > > '(String "kawa string)'; it seems to work well, although it does
> > > introduce clutter.
> >
> > I don't see how to avoid that in general.  One could write a wrapper Map
> > that uses a coercion function to convert the key to required type,
> > similar to the coercion function in the make-parameter function.
> >
> > Another way is to call the toString method, since Kawa strings
> > implement java.lang.CharSequence:
> >    ("kstring":toString)
> >
> > This is cheap if the Kawa string is an IString, since uses a
> > java.lang.String.
> >
> > Alternative syntax:
> >
> > (->java.lang.String "kstring")
> > or shorter:
> > (->String "kstring")
> > --
> >         --Per Bothner
> > per@bothner.com   http://per.bothner.com/
> >
> --
> Jamison Hope
>


-- 
Duncan.