1. If/else - Where did "isNAN" come from?


For the first lesson of "more on control flow in JS", everyone's code that I see in the forum is using "isNAN". I haven't seen this anywhere in the entire JavaScript course up until this point. I'm curious. Was it covered somewhere before this lesson in this course..if so, where was it covered? If it wasn't covered in this course, then where are people getting it?


for the first exercise it isn't used? That is the second exercise (if/else if/else), there the function is explained


Thanks. I didn't see any examples for lesson 1 so since I couldn't get good code for that lesson, I didn't know that isNaN came up in lesson 2. I have since solved lesson 1 and see that isNaN is covered in the following lesson.


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