[Haskell-cafe] What is the good way to work with list comprehension and UTCTime?
roma at ro-che.info
Fri Sep 14 10:03:01 CEST 2012
Consider using the time-lens package.
List comprehension style:
[modL seconds (+ fromIntegral n) t | n <- [0..]]
[modL minutes (+ n) t | n <- [0..]]
(you need fromIntegral for seconds, because it is of fractional type in
iterate style, as suggested by Karl:
iterate (seconds ^+= 1) t
iterate (minutes ^+= 1) t
On Fri, Sep 14, 2012 at 7:29 AM, Magicloud Magiclouds <
magicloud.magiclouds at gmail.com> wrote:
> Simple usage, I could make an instance of Enum to UTCTime, so
> [utcTime..] could work. But that is so stiff. How if sometimes I want
> to step by 1 min, sometimes I want to step by 1 sec?
> So I think some way like [ t | addUTCTime last 60 ] could be nice.
> But I cannot figure it out....
> Any idea?
> And for G+, please use magiclouds#gmail.com.
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