![]() ![]() Say, we need to check if a value is equal to 100. So we can't simply compare an argument to NaN in order to check if it's equal or the same. Why does this method isNaN even exist? Well, it exists because there is no easy for us to check if a value is NaN. So why do we need a method to check for NaN. Trust me, when you do this, it will help ease a lot of confusion □♀️. That way your brain won't think of it as "not a number".Īlright moving forward, we will stop referring NaN as "not a number", it's just another value and this value is called NaN. Refrain from referring it in its literal term of, "not a number", just pronounce it as one word, nan. Just like how 200 is a value, NaN is also its own value. and yet no one here interpreted the question that way. Daniel Carrera at 11:32 1 Taking the bait: DanielCarrera. turning 'dog' into a number (which of course can be done). log (invalid ) // NaN # Tips to understanding NaNĪnother way that helped me understand this, is thinking NaN as its own value. 1 In absence of OP's clarification, this question could be interpreted in the sense of converting any string to a number, i.e. You get NaN when you try to do some mathematical operations on values that are not Numbers.Ĭonsole. It would be much more accurate to think of NaN as being "invalid number", "failed number," or even "bad number," than to think of it as "not a number." Sure, it's "not a number" but it doesn't evaluate to NaN. ![]() If you think of it in its literal term, you might interpret it as whatever is "not a number", then it must be NaN. But I think this is the source of the problem. # Understanding NaNĪlright, let's move on to understanding what NaN is. Just to be super clear, the difference between these 2 methods is that Number.isNaN doesn't coerce or forcefully convert the argument to a Number before determining whether it has the value NaN. Second, it will check if the argument has the value NaN, if so, it will return true.First, it checks the type using, for instance, typeof (argument), and if it doesn't evaluate to number, it will return false.# Number.isNaNĭetermines whether the argument is NaN and its type is Number. So this method will first coerce the argument using, for instance, Number(argument), and if it evaluates to NaN, it will return true. Returns true if the argument coerces to NaN, otherwise returns false. Let's try to understand what these two methods are doing. ![]() Don't worry, I was too! Let me try to demystify this for you. Wait, shouldn't the NaN check return true for a string and false for a number? NaN means "not a number", so shouldn't it be checking for something being "not a number". isNaN ( 'string' ) // false # I'm confused. String replace all javascript JavaScript Convert String to Number. What? □ isNaN ( 'string' ) // true // Better ✅ ![]()
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |