Project Euler is a series of challenging mathematical/computer programming problems that will require more than just mathematical insights to solve. Although mathematics will help you arrive at elegant and efficient methods, the use of a computer and programming skills will be required to solve most problems.
The motivation for starting Project Euler, and its continuation, is to provide a platform for the inquiring mind to delve into unfamiliar areas and learn new concepts in a fun and recreational context.
Broadly speaking, there are two ways to handle errors as they pass from layer to layer in software: throwing exceptions and returning status codes. Almost everyone agrees that exceptions are the better way to do it, but some people still prefer status returns. This article shows why exceptions are better.
There has been a great deal of interest in closures lately, driven in great part by the fact that there is talk of adding some form of anonymous functions to the Java. Most of the time, people talk about “adding closures” to Java, and that prompts a flurry of questions of the form “what is a closure and why should I care?”
The lucky kids of JavaSchools are never going to get weird segfaults trying to implement pointer-based hash tables. They're never going to go stark, raving mad trying to pack things into bits. They'll never have to get their head around how, in a purely functional program, the value of a variable never changes.
These twenty video lectures by Hal Abelson and Gerald Jay Sussman are a complete presentation of the course, given in July 1986 for Hewlett-Packard employees, and professionally produced by Hewlett-Packard Television.
I take you on a simple stroll through Lisp's basic constructs and then ramp up quickly. You'll see Lambda expressions, recursion, and macros. This quick tour should give you an appreciation of Lisp's productivity and flexibility.