CSS:
How to hide element
HTML:
Semantic (why and what it is)
REST:
build a correct rest api (use correct names, methods, CRUD)
React:
Reconciliation
State vs Props
HOC
Lifting state up
Lifecicle methods
Hooks (just to name it)
How to avoid unnecessary re-render (Pure component, ...)
JS:
Strict/Unstrict comparison
Live coding:
1. Given an array of numbers: create array of unique values
2. Given an array of objects like {id:1}: create array of objects with unique id's

Question

CSS:
How to hide element
HTML:
Semantic (why and what it is) 
REST:
build a correct rest api (use correct names, methods, CRUD)
React:
Reconciliation
State vs Props
HOC
Lifting state up
Lifecicle methods
Hooks (just to name it)
How to avoid unnecessary re-render (Pure component, ...)
JS:
Strict/Unstrict comparison
Live coding:
1. Given an array of numbers: create array of unique values
2. Given an array of objects like {id:1}: create array of objects with unique id's

Sigiloso · Accepted Answer

Do not use array methods, like ".map or .forEach", looks like they don't like it :) use "for" cicle instead

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