Comments on: Programming Erlang: Functional Programming

By: A CouchDB primer for an ActiveRecord mindset | upstream agile - software

A CouchDB primer for an ActiveRecord mindset | upstream agile - software — Thu, 25 Sep 2008 07:55:50 +0000

[...] company called google has had a bit of success with that recently). Oh and it’s written in Erlang. Jan has given a number of talks on numerous events already, so there are already a couple of [...]

By: Alexander Lang

Alexander Lang — Mon, 26 Nov 2007 19:03:00 +0000

keine ursache. ja unter manchen keywords sind wir ziemlich weit oben bei google. und das ganz ohne seo ich muss unbedingt mal das buch weiterlesen.

By: Anika

Anika — Mon, 26 Nov 2007 13:08:42 +0000

Hallo hier der Nachschwaermer wollte nur mal hallo sagen und mich f�r die Infos bedanken. Bin zuf�llig ueber Google blog search auf Deinen aufmerksam geworden. Wei�t du eigentlich dass dein Blog unter den Top 10 ist??

By: upstream - agile web (2.0) softwareentwicklung » Programming Erlang 3: funs, list comprehensions, guards, records, if/case

Sat, 28 Jul 2007 17:25:47 +0000

[...] again a list with the results. This way we could rewrite our list processing example from the previous post like [...]

By: Alexander Lang

Alexander Lang — Wed, 25 Jul 2007 08:25:35 +0000

cool thanks. that makes playing around with erlang much easier.

By: David Mercer

David Mercer — Tue, 24 Jul 2007 18:34:12 +0000

Since I’m lazy, I get around the limitation of not being able to enter function definitions in the shell by using the format

F = fun() … end.

This isn’t as always as easy as it looks however, when recursion is involved. For example, I write the classic permutation function in the shell by dividing it into two functions:

P = fun([],F)->[[]]; (L,F)->[[H|T] || H <- L, T <- F(L–[H], F)] end.
Perms = fun(L) -> P(L,P) end.

Now
Perms([1,2,3]).
evaluates correctly to
[[1,2,3],[1,3,2],[2,1,3],[2,3,1],[3,1,2],[3,2,1]]

By: Alexander Lang

Alexander Lang — Tue, 24 Jul 2007 09:32:40 +0000

oops, sorry and thanks for the hint. just fixed it.

By: Lennart Augustsson

Lennart Augustsson — Tue, 24 Jul 2007 09:23:38 +0000

Your area function for a circle actually computes the circumference.

By: Alexander Lang

Alexander Lang — Tue, 24 Jul 2007 08:38:08 +0000

i just realize the author of the book is commenting on my little blog, wow

thanks for the help. i was planning to introduce list comprehensions in the next post. (have to go really slow to digest all this as it’s mostly new to me)

sorry for the buggy wordpress, i’ll see what i can do.

By: Joe Armstrong

Joe Armstrong — Tue, 24 Jul 2007 08:34:18 +0000

Indeed it was a bug.

If you type a naked “<” in the comment window it gets swallowed up. you have to write <
but there is no comment to warn you about this.

/Joe