Printing only odd pages

Look at how quickly you are getting along! Let’s remember what else a printer should be able to do:

The new printer is fairly simple: it needs to print all pages in forward or reverse order, print even or odd pages, and make multiple copies of a single page.

All we have to do is print even and odd pages. Printing only odd pages is easy:

• You need to start printing from the first page.
• After each iteration of the loop, you need to increase the number of the current page by 2, and not by 1.

Perhaps you already noticed that in loops, an increase or decrease in a variable’s value by some number is regularly used. And we constantly have to write cumbersome expressions, such as page = page + 1. Fortunately, JavaScript has several convenient operators that allow us to shorten the code. Here they are:

You can combine not only addition, but also other mathematical operations: subtraction -=, multiplication *=, division /= and calculating the remainder %=. For example, i *= 10 will do the same as i = i * 10.