[joncampbelldev]

Immutability in js is awful hence the complexity, a library like immutable.js can make it better, but the language is just not built for it.

Because imperative code and persistent, immutable data do not play nicely together.

[romanovcode]

Agree, but the problem is that you need unreal discipline because what I see in projects that are 1+ years old half of the code is using Immutable.JS and half is not - and that is even worse!