Help me understand.Why does my code "Calculator" work in my browser and not here in the console

Answer 1

Code for question: https://code.sololearn.com/W4x9U3p8e5dz/?ref=app

Pretty sure the line:
var box=document.getElementById("display");

is being executed before the page is loaded, therefore the element display is not found.

This can be fixed by declaring the global variable box as empty and setting it inside a body or window onload function.

Here is your code with the changes I mentioned
https://code.sololearn.com/WQ3jdxz50l8e/?ref=app

Answer 2

https://code.sololearn.com/Wnq4BuoD8aGy/?ref=app

Answer 3

Thanks!