checklist.md

1. [CODE STYLE] - don't mutate object or arrays - it will cause unexpected results later on. You should make copy using Object.assign or spread operator

2. [CODE STYLE]: Use switch statement if you have limited amount of conditions.

3. [CODE STYLE]: switch/case should always have default case for error handling.

4. [DONT REPEAT YOURSELF] - If you perform same action in all switch cases - do it just once afterwards.

5. [NAMING] - use proper names for object copy

BAD EXAMPLE:

const copy = { ...state }

GOOD EXAMPLE:

const stateCopy = { ...state }