A few things are becoming de-facto solutions in JavaScript with a lot of tutorials but without much discussion about the practical benefits and reasons. The goal of this series is to talk about these topics.

The rules:

• Speak about the whys, not the hows. It's okay to include a few favorite libs and patterns but it should not be the main focus of your comment.

• No Googling! I am interested in Your opinion, experience, anecdotes, and gut feelings.

This week's topic is Immutable Data

• Why is it so popular?

• When do you use it? Does it belong to the back-end, the front-end or both? Do you use it together with specific patterns or tech stacks?

• Do you use it because it's your stack's best practice? Do you consciously choose a stack the relies on immutable data?

• Did you ever have issues with mutable data?

• Whatever pops into your mind about Immutable Data.

All comments are welcomed, there is no wrong answer!