Re: [rust-dev] How would you map one vector to a vector of a different element type?

[Scott Lawrence]

I would think:

let ports = do myvect.iter().map { |e| something(e) }

On Sat, 2 Nov 2013, Leah Hanson wrote:

Hi,

I have a ~[~str]. I have code that will turn a ~str into a Port<uint>.

I want to end up with a [Port<uint>]. (or ~ or @ or whatever. I just want
to be able to iterate over the Ports later.)

Since I'm not sure what looping construct to use, I tried with a for-each
loop.

~~~
let ports = for s in myvect.iter() {
         let (pport, cchan) = stream();
         do spawn {
           cchan.send(fun(*s))
         }
         pport
       };
~~~

As you  might, expect I got an error:
error: mismatched types: expected `()` but found `std::comm::Port<uint>`
(expected () but found struct std::comm::Port)

From this, I take it that for loops must return `()`, rather than an actual

value. When I searched for a map function in the documentation, I only
found a Map type.

How would you map one vector to a vector of a different element type?

Thanks,
Leah

--
Scott Lawrence
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