In this article I will share with you some tips about JS that can improve your skills in JS !
Includes method to avoid multiples checking
You can easily replace this 
if (value === 'a' || value === 'b' || value === 'c') { ... }

By
if (['a', 'b', 'c'...

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Improve your JS skills with theses tips

Includes method to avoid multiples checking

Avoid Else when you return value in your if

Avoid ForEach, use more Filter, Map, Reduce, Every & Some function