Functional Programming in JavaScript

Chapter 6. Bulletproofing your code

This chapter covers

• How functional programming affects program testing
• Identifying challenges of testing imperative code
• Testing functional code with QUnit
• Exploring property-based testing with JSCheck
• Measuring program complexity with Blanket

Good fences make good neighbors

Robert Frost, “Mending Wall”

Welcome to part 3 of this book. Having read parts 1 and 2, you’ll have noticed a central theme: functional programming makes your code easier to understand, read, and maintain. You can even say its declarative nature makes your code self-documented.

Now that you’ve written functional code, how do you prove that it works? In other words, how do you ensure that it meets the specifications laid out by your ...