Why do i get errors when I separate the scripts in Code Playground?

Question

Here is my code:

https://code.sololearn.com/WRd2oe54y92G/?ref=app

Answer 1

Try
window.onload = function delay(){

// your entire Javascript code here

}
//this is because your Javascript loads before your document & causes issues like undefined.
//hence delay your Javascript execution till doc load

Answer 2

@Lord Krishna, thanks. window.onload works as well as setTimeout. But when I do that, the onclick value in html becomes undefined.

Answer 3

Wow thanks..