Rails apps use an MVC architectural pattern. A visit to a blog’s users index page, for example, follows these steps:

When I was studying at the Flatiron School a little while ago, Tute Costa gave a talk about refactoring like a pro. During his presentation, as he edited code, ran tests, and saved files, he pretty much never left the command line. How did he do that? Well, he used…

The quickest way to use regular expressions to check a string for a pattern in JavaScript is the .test() method. If there’s a match, .test() returns true; if not, it returns false. /4/.test(“345”); //=> true /8/.test(“345”); //=> false

Regular expressions match patterns. (The text pattern “an,” for example, matches twice in “Manhattan.”) It’s a simple concept, but at first glance regular expressions can be pretty inscrutable. For one thing, the term regular expression doesn’t sound like it has anything to do with pattern-matching. …