This F# Snippet illustrates a way to divide a sequence into a sequence of shorter sequences of a fixed length. The snippet uses list comprehensions. I don’t like it, because it involves flipping through the original sequence over and over and over. With recursion, we can do all the construction in one pass through the … Read moreF# Snippet: sequence partitioning
LinkedIn integration instructions provide the following syntax: http://platform.linkedin.com/in.js we say, WTF? what kind of script tag has a src attribute and content as well? It turns out that the JS in the src attribute is pulling those lines out of the DOM and parsing them. It is not really JS inside there, but a language … Read moreDaily Javascript: input arguments to scripts
How do you test whether a JavaScript object is empty?The short answer (if you’re using JQuery) is: $.isEmptyObject(obj) The longer answer is, you loop through its properties. This is the method JQuery is using. for(var prop in obj) { // it is not empty if this hits} The even longer answer is, you loop through … Read moreDaily JavaScript: empty objects
Separation of concerns is a challenge in a web application. The quick, straightforward way to control a page winds up being messy, with business logic and application logic and view logic all mushed together. Here at my Stealth-Mode Startup, we’re using the Sitebricks web framework on top of Guice. One pain point in our webapps’ … Read moreCross-platform problem solving: how an Android Pro Tip helps our web app design
Reference post. Don’t expect this to be interesting. We had a particular subdirectory of a repository (repoA) that really belonged in repoB. The goal is to transfer all files and history from repoA to repoB, permanently. Thanks to Nikolai in this blog post, the move isn’t too bad. I’m not going to repeat his instructions. … Read moreStupid git tricks: transferring part of one git repo to another
Listening to Glenn Block talk about node.js at Technology and Friends, there’s something interesting about the philosophy behind node.js. Threads are hard. Threads include overhead, but more significantly, using them requires the developer to hold more stuff in his head. Node.js has a philosophy that leads to asynchronous processing without multiple threads. Glenn explains how … Read morestarting to maybe get the point of node.js
This may be basic JavaScript:TGP, but I’m just getting the hang of it. I asked my JS peeps the other day, “If I have two functions and I they each need access to one internal function, how do I encapsulate that?” If I need to define one function that uses a nested function, all is … Read moreEncapsulation in Javascript
One of the goals of Scala is increased consistency compared to Java.Here are three high-level consistencies in Scala: Every value is an object. There are no primitives in Scala. Even its version of void (Unit) is an object. Nothing is an object. Nil is an object. Arrays are objects. Everything is an object. Every statement … Read moreConsistency in Scala
In Scala, the “for” structure can throw off the Java programmer. For one, it looks enough like a Java “for” loop for a Java programmer to make a guess on how it works — but that guess is likely to be wrong. For another, the for-loop is implemented in Scala as a special case of … Read moreFor-confusion in Scala
The topic of discussion at the office today (yes, it’s Sunday) is Languages, Verbosity, and Java by Dhanji R. Prasanna, which purports to extoll the clarity of Java compared to more expressive languages like Ruby, Python, and Scala. What it really says is: “Languages that are familiar are more readable.” Of course languages that are … Read moreFamiliarity v readability