Mastering JavaScript Functional Programming - Second Edition

Solution 1 – hoping for the best!

How can we solve the problem? The first solution may seem like a joke: do nothing, tell the user not to click twice, and hope for the best! Your page might look like Figure 2.1:

Figure 2.1: An actual screenshot of a page, just warning you against clicking more than once

This is a way to weasel out of the problem; I've seen several websites that just warn the user about the risks of clicking more than once (see Figure 2.1) and actually do nothing to prevent the situation: The user got billed twice? We warned them... it's their fault!

Your solution might simply look like the following code:

<button id="billButton" ...