Mastering Immutable.js

A scary class of bugs

Imagine that you're trying to bake a loaf of bread. Nothing fancy, just a plain loaf. You don't even need to look at the recipe—it's just a handful of ingredients, and you've memorized the steps. Now suppose that one or two of your ingredients have been changed without your knowledge. You still follow the steps, and the end result still looks like bread, but then your family eats it. One family member says something tastes off, another doesn't seem to notice anything, while yet another heads straight for the washroom.

These are just some of many possible scenarios that could have played out, and the problems all stemmed from the ingredients used. In other words, because the ingredients were allowed to change, they did ...