Engrain by ByteRush

JS.06.04 Mid-level

Immutability patterns

Comes up in: React, JavaScript

This concept is being written. It gets the full five steps — explanation, predict, interview angle, practice with tests, and review cards. Here is exactly what it will cover, so you can study it elsewhere in the meantime.

What it covers

  • non-mutating array methods (toSorted, toReversed, toSpliced, with)
  • updating nested state
  • structural sharing
  • Immer idea

Words you will know

immutabilitystructural sharing

What you will practise

  • update nested state 5 ways