On Friday, 7 October 2016 03:13:32 UTC+1, Dave Ford wrote:
>
> void myFunction(int x){
> if(x < 1){
> *throw new IllegalArgumentException("error: x must be >= 1"); *
> }
> return x * x * x;
> }
>
> I look at runtime exceptions as a good thing. It's kind of like having two
> returns. One return for the normal answer (return). And another for error
> conditions (throw).
>
myFunction : Int -> Result String Int
myFunction =
if x < 1 then
Err "x must be >= 1"
else
Some x * x * x
errorResult : Result String Int
errorResult = Result.map (myFunction) (myFunction 0)
-> Err "x must be >= 1"
okResult : Result String Int
okResult = Result.map (myFunction) (myFunction 2)
-> Some 64
"Could have a string error" is kept with the type in the same way that
"could throw IllegalArgumentException" is.
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