By default, tuples, discriminated unions and records have what is known as structural equality – i.e. if two instances of these types have the same set of values then they are considered equal, just like value types – despite being reference types: Tuples Discriminated Unions Records To facilitate this form of equality, the F# compiler …
F# – Referential equality for tuples, discriminated unions and records Read More »
Pattern matching is everywhere in F#, you can use it in let bindings, in function parameters, in for loops, everywhere, and it is totally amazing. It is in my opinion one of the best features of F#, and in functional languages in general, heck, Erlang goes as far as not having an assignment operator and …
F# – Exception handling the pattern matching way! Read More »
Ayande posted a tax calculation challenge the other day here, and here’s my F# solution for the challenge: Enjoy!
When you consider the age old problem of representing different shapes (circle, triangle, square, rectangle, etc.) my OO fed developer brain naturally jumps to a class hierarchy along the line of: This is perfectly fine and legit, but it’s not the only way to approach things. Since I’ve been on a more varied diet of …
F# – Use Discriminated Unions instead of class hierarchies Read More »
C# developers should be familiar with the yield keyword that was introduced in C# 2.0, and you’ll be pleased to know that F# also has the yield keyword which works in conjunction with F#’s equivalent of IEnumerable – sequences. You can create sequences in F# using sequence expressions: In addition, you can also use the …
In F#, you can defined record types which differ from tuples and discriminated unions in that they allow you to organize values into a type and name those values through fields: Looks like a cut-down version of a standard .Net class with a couple of properties? Yes they do, but records offer several advantages over …
I’m taking a bit of time to brush up my knowledge of F# and see if I can write better F# code and one of the things I notice is that whilst I use pipe-forward operator (|>) often when working with collections I don’t nearly use the pipe-backward operator (<|) as frequently as I should. …
You can find the google puzzle here, it’s extremely cool and equally frustrating! That’s half an hour of my life I won’t be getting back but at the end of it well satisfied to have solved it! Enjoy!
After reading Ayende‘s post today, it got me thinking, just exactly what’s the cost of a try/catch block and more importantly what’s the cost of throwing exceptions. Like Ken Egozi mentioned in the comments, I too believe the test was unfair as the try/catch block was applied to the top level code as opposed to …
I needed to find out which process is listening on a port the other day and a quick search on SO showed me the way and all you need is to run: netstat –aon | find /i "listening" and you will get a list of the ports and the PID of the process listening on …
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