Extract some pages in Acrobat DC and save that file

Question

I am writing a function that extracts some pages from a document so it can be used as proof. I have used a switch case that if it is true will output some pages. In the third case I want to extract the first two pages of the document, the 23rd and 24th and the two last pages. This is what I cant solve. Can I just use the this.extractPages method or do I have to use the insertPages method also. If I need the insertPages method how do I use it. The code is inside a trusted function.

switch (true){
case this.numPages == 1:
this.extractPages(0,0, newPath);
app.alert("A one paged proof has been created",3)
break;

case ( (this.numPages > 1) && (this.numPages < 9) ):
this.extractPages(0,1, newPath);
app.alert("A two paged proof has been created",3)
break;

(PROBLEM IS HERE)
case ( (this.numPages > 9) && (this.numPages < 49) ):
this.extractPages(0,1, newPath);
app.alert("A proof has been created",3)
break;

default:
app.alert("No proof has been created",3)
break;

Answer 1

In the third case, you'd need to extract the three parts separately, save to disk separately, then and stitch them back together leaving a bunch of smaller files that Acrobat can't delete. You're better off just deleting the pages you don't need from the source and then saving to a new file.