[Haskell-cafe] How can i safely change the value of specified key ?

[zaxis]

>>replace k v xs = (k,v) : filter ((/=v) . fst) xs
Great !  thanks you very much


minh thu wrote:
> 
> 2009/10/22 zaxis <z_axis at 163.com>:
>>
>>>>f xs = (2,2222) : filter ((/=2) . fst) xs
>> It works but not general as `f` still needs to change other value
>> according
>> to the "KEY".
>> Maybe Data.List will supply what i need.
> 
> I don't think Data.List has what you want as-is. The above code is
> generalized simply:
> replace k v xs = (k,v) : filter ((/=v) . fst) xs
> 
> Cheers,
> Thu
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