please help, why querySelectorAll not working, and even get element by class name also not working,

Question

https://code.sololearn.com/WwHph2qXu1kz/?ref=app

Answer 1

querySelectorAll() and getElementsByClass() returns array like object. To access individual element you need to provide index.

a[0].style.display="none"

Answer 2

th35kyb0y ,
You are welcome :)

Answer 3

🇮🇳Omkar🕉 thanks bro now it's working, I forgot the basics