Tricky JavaScript Interview Questions |
Tricky JavaScript Interview Questions | #0117 #javascript
Welcome to Coding Frontier,
In this YouTube Short, let's break down some tricky NaN (Not-a-Number) behavior in JavaScript! 🚀
First, when we do console.log(typeof NaN), it surprisingly returns "number"! Even though NaN means "Not a Number," JavaScript still categorizes it as a number type.
Next, console.log(NaN === NaN) returns false! This happens because NaN is the only value in JavaScript that is not equal to itself. If a computation results in NaN, it's considered invalid or indeterminate.
Lastly, console.log(isNaN("100px")) returns true because "100px" cannot be converted into a valid number, making it NaN. The isNaN() function checks whether a value evaluates to NaN or not.
This is why NaN handling in JavaScript can be tricky but understanding these quirks can help you avoid unexpected bugs!
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