[Haskell-beginners] Copy record with mutations?

[MAN]

Yeah, that's basically it.

Keeping in mind that Haskell's data structures are immutable

"let stang68 = stang67"

allows to use symbol "stang68" as a new Car. Whether an actual copy is
made does not matter: even if both "stang"s point to the same structure
you're not allowed to change its values.

El mié, 13-04-2011 a las 17:27 +0200, Christopher Done escribió:
> On 13 April 2011 17:22, Andrew n marshall
> <andrew.n.marshall at gmail.com> wrote:
>         
>         Is there a syntax or function to copy a record, but with
>         select fields populated with new values?
>         
>         
>         For example, extending LYAH's Car
>                 let stang67 = Car {company="Ford", model="Mustang", year=1967}
>                 let stang68 = stang67 `mutate` Car {year=1968}
> 
> 
>         let stang67 = Car {company="Ford", model="Mustang", year=1967}
>         let stang68 = stang67 { year = 1968 }
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