Jeon-Young Kang writes:
Dear All.
Hope your 2016 is off to a great start.
I would like to get results from pattern matching or something.
Here is the my code.
data Person = Person {name :: String, age :: Int}
names = ["tom", "sara"] -- list of names, String
persons = [Person {name = "tom", age = 10}, Person {name="sara", age=9}, Person {name = "susan", age = 8}].
Is there any solution to get the age of "tom" and "sara"?
I have no idea of pattern matching for this one.
I've tried to use recursion, but I couldn't find any solution for list of records.
How about using `filter`[1] over `persons` with a function checking if the name is in `names`? I'm sorry, but this sounds like home work so you won't get more than this from me. /M [1]: http://hackage.haskell.org/package/base-4.8.1.0/docs/Data-List.html#v:filter -- Magnus Therning OpenPGP: 0x927912051716CE39 email: magnus@therning.org jabber: magnus@therning.org twitter: magthe http://therning.org/magnus Would you go to war without a helmet? Would you drive without the seat belt? Then why do you develop software as if shit doesn’t happen? -- Alberto G ( http://makinggoodsoftware.com/2009/05/12/hdd/ )