On Tue, Apr 28, 2009 at 4:09 PM, Vasili I. Galchin <vigalc...@gmail.com>wrote:
> Hello, > > Is there anyway when defining a dat type record struct to indicate > default values for some of the fields? The usual pattern is to use a default record, and specialize it: data Foo = Foo { bar :: Int, baz :: Int, quux :: Int } fooDefault = Foo { bar = 1, baz = 2, quux = 3 } newRecord = fooDefault { quux = 42 } If you only want some of the fields to be defaulted, you can make them undefined in the default record... unfortunately this won't be checked by the compiler. Luke
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