36
When we have an error in the sum of a number with Javascript, it is returned NaN.
Example:
parseInt('a') + 3; //NaN
What does it mean NaN?
5 answers
33
Global ownership
NaNis a special value that means Not-A-Number (is not a number).
Source: MDN
Say the description there:
NaN is a property of the global object, not rewritable, not configurable and not enumerable.
In modern browsers, the NaN is a read-only and not configurable property. Even when this is not the case, avoid overwriting it.
The use of NaN. It is returned when a mathematical operation fails (for example: Math.sqrt(-1)), or when a function tries to turn a string into an integer for example parseInt("blabla").
NaN validate false when converted into Boolean and can be used isNaN() to check if a value is NaN.
17
Definition and Use
The Nan property represents a value "Not-a-Number".
This property indicates that a value is not a legal number.
The Nan property is the same as the Number.Nan property
It is also returned Nan when a mathematical operation does not return an understandable value or when you try to sum some numbers, but in some of your fields there is no value, and there is no Try Cath to treat the exception, thus, he cannot complete the mathematical operation.
16
Nan stands for Not-A-Number.
It means something is not a valid number.
In this case, you are trying to parse from 'a' to INT, but 'a' is not a number, so the Nan error is generated (Not-a-number).
more information: http://www.w3schools.com/jsref/jsref_number_nan.asp
14
The estate NaN represents "Not -to- NUmber".
This property indicates that a value is not a legal number.
3
The global property Nan is a special value meaning Not-A-Number (not a number).
In this example, it is one of the situations that is returned the value 'Nan', in this case the conversion of a string 'alphabet' to number.
You can use the isNaN() function to verify that one, calculation, conversion, value is equal to 'Nan'. Vide : https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/isNaN
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This has been answered before, including the link is the same as the @Sergio reply, but is translated.
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I believe it is
Not a Number, but I’m not sure, so I’ll wait for an answer too.– DiegoAugusto
I CAN’T BELIEVE! No one linked to "Wat", Nan’s definitive explanation: Wat by Gary Bernhardt [with Captions]
– brasofilo
kkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkk "WAT" array.Join("Wat" -1) + "Batman"; fellings hhusahuss
– Gabriel Rodrigues
Meta discussion: It is wrong to ask for things that are easily found (as some judge) on Google?
– Jorge B.
Unbelievable as it may seem, "Not to Nnumber" is a number
– Costamilam