Re: [Haskell-beginners] truncate results depend on strict/lazy

9 Sep 2013

      On Mon, Sep 09, 2013 at 01:34:24PM -0400, Mihai Maruseac wrote:
...
On Mon, Sep 9, 2013 at 1:26 PM, Bryan Vicknair  wrote:
...
Deep in a WAI web app, I have a function that converts a String from a web form
like "0.12" to an Int 12.  Converting "0.12" to the Float 0.12 is working.
However, converting the Float 0.12 to the Int 12 does not work as expected
unless I use the trace function.
Not answering your question but can't you read . drop 1 . dropWhile
(/= '.') $ "0.12" ?
That would work for the specific input of "0.xyz", but in general, the input
string may encode a float with an arbitrary number of digits on both sides of
the decimal.

In reality, the range is probaby from 0.10 to 1.99, so I considered writing a
parser for just that range, and I may still, but this behavior is so surprising
to me that I feel like I need to understand it.