[Haskell-cafe] What is the good way to work with list comprehension and UTCTime?
magicloud.magiclouds at gmail.com
Fri Sep 14 10:25:58 CEST 2012
This is nice. Thanks to all.
On Fri, Sep 14, 2012 at 4:03 PM, Roman Cheplyaka <roma at ro-che.info> wrote:
> Consider using the time-lens package.
> import Data.Time.Lens
> import Data.Lens.Common
> 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?
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