Ask HN: How do you learn a new programming language?

First, I go through a light language overview: fundamental concepts and syntax. This gives me a feel language, whether or not I want to pursue it (I keep revisiting and abandoning Clojure), and what I can learn from it and apply to other development in other programming languages I already know. For example, playing with programming languages with functional influences (Python, Scala) has influenced how I write Java code in my day job (more static functions, object composition over class inheritance, more re-use) even if I rarely touch those influential languages. For examples of a light overview, take a look at anything on w3schools.com or take a look at <a href="http://tour.golang.org" rel="nofollow">http://tour.golang.org</a> which I read recently. I've taken notes before and it seems to provide very little value, especially if you have access to the light overview again.<p>Then you must build something to exercise that learning. If you just read and don't build, it'll slip away just as quick as it came. Solving an actual problem that you have is a good motivator for building something. Recreating something as you believe it should be is another one; for example, build your ideal word processor. Complete learning involves building things of significant complexity.<p>I would learn complementary languages to diversify skills. If you know C#.NET, time spent also learning Java is not necessarily that beneficial. They are similar. However, learning Bash for shell programming is at a different level of abstraction and is optimal for tasks that the aforementioned languages are not.

I like to find a good basic intro to the language (like a book or a tutorial series) and work through it. After every chapter I write a small program that focuses on using the subject of the chapter. After I finish the book or tutorial I like to write a program that I will use.<p>At this stage I think programming for yourself and developing a passion for your chosen career is more important than mastering a language. I wrote a blog post about that if you want an example of what I'm talking about. <a href="http://progfiles.wordpress.com/2012/04/29/flow/" rel="nofollow">http://progfiles.wordpress.com/2012/04/29/flow/</a><p>I think taking notes is good for making sure you understand a concept. If you can summarize it accurately you probably know it well enough. Also notes are nice when you want a refresher on something, but don't want to hunt through the source to find it.<p>I recommend Eloquent Ruby (The Kindle version is only $17).

Rather than learning a new language, I suggest that you solve a problem. Any problem. Programming is used to solve problems ranging from controlling elevators to sharing information.<p>Do you already know where you would like to apply your programming skills? Creating games? Creating software programs that control a space shuttle? Creating a website which a specific target?<p>Just look around you and think how you can possibly make something better. There are lots of interesting things that are waiting to be solved. The world is your oyster.

I read a little about the language to get a feel for what its mainstream use. Objective-C is for iOS programming, Ruby is for Rails and the web, etc. then I think of a little project to write in that language.<p>I then run through a couple of tutorials, bending them to the project that I had in mind. By the time I make good headway on my project, I've got a basic level of familiarity with the language.

In order to grow as a programmer you should spend time programming. Lots and lots of time. Why do you want to be a programmer? What kinds of programs do you want to write? Start writing those programs--you will learn by doing. You will learn a language by writing programs in that language, solving problems as you run into them.