Now take a look at example D, where it says what is this in strict mode. so in this situation, I'm doing something here on line 36 from saying use strict and that basically says to the JavaScript engine for the execution of this function, use strict mode. And the difference here is that while this function executes, we're going to be in strict mode. So the the thing to behavior you'll see is different in the console, copy this code, paste it in your console, and we get cannot read property speed of undefined. So speed of undefined, that means the object that we're trying to get a speed property from is undefined. So this dot speed, it's not that this speed is undefined is that this is undefined.

And the reason is, because when we're in strict mode and browser based JavaScript, when we're in strict mode, we can't access the window object using this From a global function, it's just a one of the characteristics of strict mode. So, I'm going to continue out of strict mode, but I just wanted to point out that it's important to know that when you're using strict mode, you cannot access the window object using this inside of a global function.