Summary

In this chapter, we had some important, more advanced topics that we still had to cover, but that you were probably not ready for earlier in the book. After this chapter, you should have deepened your understanding of JavaScript in several areas, first and foremost, regular expressions. With regex, we can specify patterns of strings and we can use these to search other strings for matches to our patterns.

We also considered functions and the arguments object, with which we can access arguments by their index. We continued with a look at JavaScript hoisting and strict mode, which enables us to use JavaScript with a few more rules. Getting used to JavaScript in strict mode is generally a good practice and is great preparation for working with JavaScript frameworks.

Debugging and tweaking were also discussed: we can use breakpoints or log our output to the console to get an idea of what is going on. Handling errors well can prevent unnecessary crashes of our program....