Chapter 5
Harnessing the Power of Functions
IN THIS CHAPTER
Getting to know JavaScript functions
Creating and using custom functions
Passing and returning function values
Working with anonymous and arrow functions
Getting to the bottom of variable scope
Understanding recursive functions
The ability to simplify means to eliminate the unnecessary so that the necessary may speak.
—HANS HOFMANN
Way back in Book 1, Chapter 1, I introduce two methods: alert() and document.write(). Although not part of the JavaScript standard (they come from separate Web APIs; refer to Book 4, Chapter 6), web browsers make them available so that you can use them in your JavaScript code. Both alert() and document.write() are examples of ready-to-run features that you can use without having to know anything about how they work internally.
When you combine all the built-in JavaScript features with all the Web ...
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