How ImmutableJS works
In this lesson, we'll take a quick look at the internals of ImmutableJS so that we have a better understanding of how can we apply Immutable.js to our Redux app in a performant manner.
Immutable data structures can’t be changed. So when we convert a regular JavaScript object with fromJS
what ImmutableJS does is loop over every single property and value in the object (including nested objects and arrays) and transfers it to a new, immutable one. (the same thing applies in the other direction for toJS
)
The problem with standard JavaScript objects is that they have reference equality
. That means even when two objects have the same content, they’re not the same:
Get hands-on with 1200+ tech skills courses.