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March 2008 - Posts

Thursday, March 27, 2008 10:56 AM

Single-case Active Patterns vs Function Calls

In response to an earlier post a reader wrote: Sent From: namin Subject: (|EnsurePrefix|) -- why is it an active pattern? __________________________________ Hi Chris, I was reading your blog entry Regular Expressions via Active Patterns and I am puzzled
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Wednesday, March 26, 2008 8:32 AM

How not to reverse a list

Brian McNamara, the latest addition to our stellar F# dev team, wrote up a great blog post on some pitfalls of F#. Specifically, how if you aren't careful something as simple as reversing the items in a list can take on order O(N^2) time and potentially
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Saturday, March 22, 2008 10:17 AM

Project Euler - Problem 24

Project Euler problem 24 in F# Problem 24 is defined as: A permutation is an ordered arrangement of objects. For example, 3124 is one possible permutation of the digits 1, 2, 3 and 4. If all of the permutations are listed numerically or alphabetically,
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Thursday, March 13, 2008 12:19 PM

How to debug compiler generated code

James Margetson recently showed me a great tip for debugging compiler generated code. Typically the problem is that using the Visual Studio debugger all you see is the x86 disassembly of the JIT-ed methods, but what you really need is the IL opcodes that
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Thursday, March 06, 2008 9:09 PM

Project Euler - Problem 19

I haven't been to Project Euler in a while, but since I'm seeing other F# folks are getting into it, I figured I'd help work to improve the average F# 'genus rating' on the site. (Currently at 11%.) The easiest one I haven't already solved is problem
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Tuesday, March 04, 2008 3:47 PM

How not to name types and identifiers

From the 'code which is valid but looks strange and might be removed in the next release of F#, but isn't a big deal anyways' department: Adding managed, generic .Net names as part of the inference proceedure process. #light open System.Collections.Generic
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