Have you ever wondered what is NaN
error coming in your project? 🤔
Today, in this article I am going to discuss the NaN
error in detail.
Let's get started 🚀
In JavaScript, NaN stands for Not a Number.
This error occurs when you parse something to a number that is not a number
Let's see it with an example,
var helloWorld = parseInt(helloWorld);
This will return NaN
didn't get it? No problem let's get a little simpler
var helloWorld = parseInt("Hello World");
"Hello World"
is a string
and we are parsing to an integer but that is not possible therefore the browser will return NaN
isNan()
Method
isNan()
will return true if a value is NaN
isNaN(18)
// false
isNaN(18.81)
// false
isNaN("JavaScript")
// true
isNaN("233.3")
// false
isNaN('17/01/2022')
// true
As you can see numbers
will return false as they are not NaN even if, the number is in the form of string
.
Any string (word or sentence) will return true as it is NaN
Me when isNaN("123")
showing false:
What about you? Comment 👇
Here comes, something that contradicts
As discussed earlier, isNan()
will return true if a value is Not-a-Number(NaN)
Number.isNaN()
method while is completely opposite of isNaN
method, here Number.isNaN()
will return true
if number is NaN
Let's go with an example,
isNaN('JavaScript')
// true
Number.isNaN('JavaScript')
// false
isNaN(18)
// false
Number.isNaN(18)
// true
Thank you for reading, have a nice day!
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