In my previous post on discriminated unions, I presented discriminated unions as an alternative to standard .Net classes to represent hierarchical data structures. However, in terms of data structure, discriminated unions share much more similarities with enums than they do classes – both allow you to define a set of named constants and associate some …
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 …
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