5th of 6 Questions.

What is the purpose of the `isNaN()` function?

The isNaN() function is used to determine whether a value is NaN (Not-a-Number) or not. It returns true if the value is not a valid number; otherwise, it returns false.

isNaN() doesn't just check if a value is currently NaN; it checks if the value cannot be converted into a number. This leads to some very famous JavaScript quirks.

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5th of 6 Questions.

What is the purpose of the `isNaN()` function?

The isNaN() function is used to determine whether a value is NaN (Not-a-Number) or not. It returns true if the value is not a valid number; otherwise, it returns false.

isNaN() doesn't just check if a value is currently NaN; it checks if the value cannot be converted into a number. This leads to some very famous JavaScript quirks.