In JavaScript, we can perform what is called lazy evaluation. Lazy evaluation means that the program does not run what it does not need to. One way of thinking about this is when someone is given a list of answers to a problem and they are told to put the correct answer to the problem. If they see that the answer was the second item that they looked at, they are not going to keep going through the rest of the answers they were given; they are going to stop at the second item. The way we use lazy evaluation in JavaScript is with generators.
Generators are functions that will pause execution until the next method is called on them. A simple example of this is shown as follows:
const simpleGenerator = function*() { let it = 0; ...
