Re: E Style

On 5 December 2010 20:23, Bill Frantz <[email protected]> wrote:
> In trying to write an E program (to actually do something useful
> to me), I noted the apparent lack of the C construct:
>
>   (bool ? true_value : false_value)
>
> What I have working now is:
>
>   def location := ( if (filename =~ `@{x}Cave@{y}`)   { 0 }
> else if \
>                        (filename =~ `@{x}Frosty@{y}`) { 1 }
> else if \
>                        (filename =~ `@{x}TTT@{y}`)    { 2 }
> else    \
>                        { -1 })
>   if (location == -1) {throw(`ERROR: Filename "$filename"
> yields $location for offset`)}
>
> (The backslashes seem to be needed.)
>
> Is there a cleaner way to code this fragment?

How about:

def location := switch (filename) {
	match `@{x}Cave@{y}`   { 0 }
	match `@{x}Frosty@{y}` { 1 }
	match `@{x}TTT@{y}`    { 2 }
	match _ { throw(`ERROR: Filename "$filename" yields -1 for offset`) }
}


-- 
Dr Thomas Leonard        http://0install.net/
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