how can I remove this URL section from this string (representing the URL) using old JavaScript?

Question

I am not so into JavaScript and I have the following problem.

I have a string like this:

https://smart.XXX.it/default.asp/s4

into a var

Answer 1

a = 'https://smart.XXX.it/default.asp/s4';
a = a.split('/');
a = a.filter((item)=>{
return item.indexOf('default.asp') === -1;
});
a = a.join('/');