Matt Baker

Test-driving your Javascript for fun and profit

With web-based UIs growing more complicated everyday, testing your Javascript code is just as vital as testing any other part of your stack. At Wealthfront we use jsTestDriver to provide test-coverage of our javascript code. We like its similarity to JUnit and the ease with which it integrates with Hudson. In this article we’ll drum […]

January 31, 2011

Adam Rosien

Quantifying Investing Skill: The Information Ratio

Quick, which manager is better? Manager A who consistently beats her benchmark by a full percentage point, or Manager B who sometimes beats the benchmark by as much as five percent, but who also can underperform the same benchmark by that same five percent? It’s not an easy question to answer. The difficulty lies in […]

January 26, 2011

Wealthfront Engineering

The Amazing FunctionMap!

FunctionMap is a handy class that allows a set of object transformations to be mapped at run time without having to define a bunch of extra interfaces and without having to evaluate the transformations at the time the mapping is created. Suppose we have an object: class NumberPair { double a; double b; } and […]

January 24, 2011


Ruby Modules

There are two common usages for modules in Ruby: namespacing and mixing in. An example of namespacing can be seen in the Math module: Math::PI # 3.14159…. Math.log10(100) # 2.0 Mixing in a module will extend that class with additional constants and methods. Here’s an example where we’ll create our own module and mix it […]

January 17, 2011

Adam Rosien

Don’t block our alleyway! But if you do…

Marty McFly: Doc, we better back up. We don’t have enough road to get up to 88. Dr. Emmett Brown: Roads? Where we’re going, we don’t need roads.

January 12, 2011

Ian Atha

The Psychology of Testing by Miško Hevery (Jan. 18, Palo Alto)

On January 18, 2011, at 6pm, Wealthfront in Palo Alto, Calif. will host the 3rd talk in our “Lean Startup for Geeks” series: The Psychology of Testing by Miško Hevery. Miško is a well-known agile coach with many contributions to the open-source world such as AngularJS, the Testability Explorer, and the js-test-driver. After a short […]

January 11, 2011