ReactJS beginner problem

Question

I have recently started learning reactjs and I got a problem with this code

https://code.sololearn.com/WUuDSZAL30TA/?ref=app

I tried it on Codepen and the console didn't show anything and there wasn't any output(of course I used Codepen reactjs setup)

Answer 1

WARLORD
Idk what is wrong on codepen since you did now show me any link to your codepen code.

But I looked into your code and found bunch of mistakes which I fixed here(look in comments, I added what mistakes you did):
https://code.sololearn.com/WTrI4lddIVV8/?ref=app

Answer 2

If you want to use React.js on playground then you need to link cdn to react and other libraries.

https://code.sololearn.com/W7smOO5OV0Vn/?ref=app

NOTE: you can remove SCSS compiler and cdn if you're not using it.

Answer 3

🔫 Rick Grimes I tried the arrow functions with () around the arguments and it worked when I tried the second time because when tried that on the second time the function worked but not the array
Thanks for helping me, and here's a "best answer" have a nice day :)

Answer 4

🔫 Rick Grimes thanks but as I mentioned in the question I used Codepen ReactJS editor and neither console and output windows showed anything