Profiling performance in Scala

Boxing and unboxing of primitive types Using primitive types in parameterized generic classes can lead to some performance degradation in Scala. Type parameters in generic classes cannot be resolved as primitive types and instead becomes Object references. This mean primitive types like Int or Float in type parameters must be converted to and from an […]

Preparing pdf-documents for the ebook reader

Briss Getting the best resolution for pdf-documents on the an ebook reader like kindle isn’t always easy, but there’s a great program available for “trimming” your pdfs. With the Java-based open-source software Briss, you can remove unnecessary margins by cropping the even and odd pages of a pdf-document. The end-result is a pdf-document that better […]

@tuple – experimenting with lisp-like syntax as XML replacement

Motivation The following post describes an experimental format which has a lisp-like syntax, with hints of JSON, for storing tree-structured data as text. The main motivation was a need to have a less verbose alternative to XML, but still be readable and editable, support pattern matching and transformation, include common binary datatypes, and enable structural […]

Trait-like CSS on HTML

Defining some CSS types One way of structuring the CSS is to define some types over the CSS classes. What these types might be may be is open, but one instance might be Behaviour, Layout and Roles. The types are not used explicitly in the CSS, but are there to help organize and abstract the […]

Reminders on Scala syntax

Reminders The companion object (both for own code and Scala’s API) Setter and getter functions are defined implicitly for val, var and referenced arguments in primary constructor. To set these manually Adding indexing operators Binding a variable during pattern matching Defining an extractor for pattern matching (example lacks validation) Imports can be grouped Types can […]

Simple serialization with XML strings in Javascript

Introduction Included in this post are some quick and simple functions for doing XML serialization in Javascript through strings. Reserved XML characters < > & ‘ ” are escaped from input and if any invalid input are found an exception will be thrown. List of XML utility functions: toXmlHeader() – Creates the XML header. toXmlElem(name: […]

Comparison against null and undefined in Javascript

Values in Javascript can come from Object – object reference String – immutable, 16-bit USC-2 Boolean – true, false Number – only 64-bit floating point, IEEE 754 (double) null – empty object reference undefined – unassigned variables and function arguments, missing object properties Boolean evaluation of values using == and != operators Values that are […]