Update: This article was written as an April Fool’s joke, taking a stab at the fact that JSON is a closed, dumb, and pretty anemic data format. There are other interesting data formats available, […]
I recently rolled my own Decimal to Roman Numeral converter in Clojure. I was inspired by some tweets about a roman numeral code kata. The Decimal to Roman Numeral converter takes a decimal number […]
ShowOff is a presentation software where you create your slides by writing simple text files containing markdown formatting. Styling is done using CSS. The slides are served by a web server and can be […]
According to this blog entry on Heroku, Clojure becomes the third language officially supported on the Cedar stack, after Ruby and Node.js. They write: – “Clojure combines the expressiveness of Lisp, the agility of […]
Heroku is a cloud application platform for Ruby/Rails and Node.js. However, the Cedar stack on Heroku makes it possible to deploy other types of applications. In this blog entry, I will first describe how to write a simple Clojure web app using the Ring library and the build tool Leiningen. Then I will show how to deploy this Clojure web app on Heroku, using nothing but Git. I will make a change and see how to deploy that. I will also show how to easily roll back to a previous release.
In a previous blog entry, I explained the higher-order function
sum and how to use the Substitution Model to follow the execution of a function. In this entry, I will use the
sum function to perform numerical integration, and in the process run into some pitfalls of Java’s BigDecimal. I will show how the language Clojure provides an elegant solution to the “exact quotient cannot be represented” problem of BigDecimal.
Section 1.3 in Structure and Interpretation of Computer Programs is about Formulating Abstractions with Higher-Order Procedures. As an example, the authors use three simple sums: a sum of an integer range a sum of […]
I just upgraded my OpenLDAP to 2.4.21 and suddenly I couldn’t load an LDIF that we in Spring LDAP have used successfully for years.
% ldapadd -Dcn=Manager,dc=jayway,dc=se -wsomepwd -f /tmp/t.ldif
adding new entry "ou=groups,dc=jayway,dc=se"
adding new entry "c=Sweden,dc=jayway,dc=se"
ldap_add: Invalid DN syntax (34)
After some time of swearing and random changes, I […]