The pattern I am writing about today is use the source. The problem is that an apprentice can be using bad habits, but he will not know if he is not reading someone else’s code. The author specifically mentions that the apprentice should look at the source code of the tools he is using. One reaction I had to this was an interview experience I had. I solved a coding problem, and my interviewer asked my what the time complexity was. I was using the Java library method Arrays.sort() but I did not look up what the time complexity of that library method. I eventually figured it out. But it made me realize that I should know more about the libraries that I am using in my code.

The author also mentions the importance of refactory code. When reading somebody elses codebase. The craftsmen should look for ways to improce the codebase, and understand why the project is built in the way that it was. This experience could also lead to apprentice refactoring his own code. The author also mentions code reviews. This is something I am really looking forward to as a professional Software Engineer. When we learn the fundamentals school, we are usually working alone, or in a small group. But in the professional world, we collaborate. This will give myself, as an apprentice an oppurtunity to learn from the source code of my coworkers. Open source is another great way for new craftsmen to gain this experience.

The author recommends that the apprentice contribute to open source, so he can read source code, and learn from it. He also mentions that if a programmer can understand a program from the source code, that means he is a good craftsmen. This makes a lot of sense to me, and understandy the code base is typically what a programmer does on their first day or days on the job. In order to contribute to a project of any size, the craftmen should know what the code currently does. So I agree that using the source is an incredibly important skill.