JavaScript uses NaN as the result of a failed operation on numbers including: In JavaScript, you can convert a numeric string to a number. For example: If JavaScript cannot convert a string to a number, it returns NaN. In this case, NaN indicates that the parsing has failed.
Full Answer
How to check for `Nan` in JavaScript?
What is NaN?
- In JavaScript, NaN is kind of a value (an invalid number).
- NaN stands for “Not a Number”.
- You get NaN when you try to do some mathematical operations on values that are not Numbers.
How to detect Nan in JavaScript?
How to Detect NaN. In JavaScript, NaN is a special value. The value NaN represents the result of an arithmetic expression that can't actually be represented. For example, let result = 0/0; console.log(result); // returns, NaN Also, if we perform any arithmetic operations with NaN, it will always result in a NaN. console.log(NaN + 3); // returns ...
How do you test for Nan in JavaScript?
isNaN ()
- Syntax. The value to be tested.
- Description. Unlike all other possible values in JavaScript, it is not possible to use the equality operators (== and ===) to compare a value against NaN to determine whether the ...
- Examples. ...
- Specifications
- See also
How to check if a variable is Nan in JavaScript?
There are five different types of operations that return NaN:
- Number cannot be parsed (e.g. parseInt ("blabla") or Number (undefined))
- Math operation where the result is not a real number (e.g. Math.sqrt (-1))
- Operand of an argument is NaN (e.g. 7 ** NaN)
- Indeterminate form (e.g. 0 * Infinity, or undefined + undefined)
- Any operation that involves a string and is not an addition operation (e.g. "foo" / 3)
What is NaN in JavaScript with example?
JavaScript Number NaN In JavaScript, NaN is short for "Not-a-Number". In JavaScript, NaN is a number that is not a legal number. The Global NaN property is the same as the Number.
What is NaN example?
Short for not a number, in mathematics and computer programming NaN is an undefined or unrepresentable value, especially in floating-point calculations. For example, 0/0 or the square root of a negative number would return a NaN result.
What does NaN () in JavaScript do?
In JavaScript, NaN stands for Not a Number. It represents a value which is not a valid number. It can be used to check whether a number entered is a valid number or not a number.
How do you get NaN in JavaScript?
In JavaScript, NaN is a number that is not a legal number. The Number. isNaN() method returns true if the value is NaN , and the type is a Number.
How is NaN represented?
Binary format NaNs are represented with the exponential field filled with ones (like infinity values), and some non-zero number in the significand field (to make them distinct from infinity values).
Why output is NaN in JavaScript?
In JavaScript, the special value NaN (meaning "not a number") is used to represent the result of a mathematical calculation that cannot be represented as a meaningful number. For example: var divisionByZod = 42 / "General Zod"; // Outputs: NaN console. log(divisionByZod);
What is a NaN value?
NaN stands for Not A Number and is one of the common ways to represent the missing value in the data. It is a special floating-point value and cannot be converted to any other type than float. NaN value is one of the major problems in Data Analysis.
What data type is NaN in JavaScript?
By definition, NaN is the return value from operations which have an undefined numerical result. Hence why, in JavaScript, aside from being part of the global object, it is also part of the Number object: Number. NaN. It is still a numeric data type , but it is undefined as a real number .
Why does NaN exist?
NaN is a commonly used term in coding to represent the output of a mathematical expression that isn't a number. It's not 0, it's not infinity, its just not a number that exists. Interestingly, if you run typeof NaN it will equal number — NaN is a number type.
How do I find NaN values?
The math. isnan() method checks whether a value is NaN (Not a Number), or not. This method returns True if the specified value is a NaN, otherwise it returns False.
How does nan work in Javascript?
Generally, NaN means Not a Number; it’s most probably used to indicate whether the method contains either error or any exceptions that occurred in the condition loop for the functions.
Conclusion
JavaScript uses a different set of built-in methods; among that isNaN () is one of the frequent methods and values for comparing the numeric and non-numeric values in the applications. If the requirement happens, it should be validated in the client browser with the help of predefined conditions.
Recommended Articles
This is a guide to JavaScript nan. Here we discuss How does nan work in Javascript and Examples along with the codes and outputs. You may also have a look at the following articles to learn more –
Introduction to JavaScript NaN
JavaScript has the number type that allows you to represent numbers including integer and floating-point numbers. And JavaScript number has a special value called NaN, which stands for N ot- a – N umber.
Checking if a value is NaN
JavaScript provides you with the global function isNaN () that returns true if its argument is NaN:
Why use NaN
JavaScript uses NaN as the result of a failed operation on numbers including:
Operations return NaN
In JavaScript, you can convert a numeric string to a number. For example:
Summary
NaN stands for Not-a-Number. It is a special value of the NaN property of the global object.
Comparing NaN
Any comparison between the two NaN's always results in false. NaN is never equal to itself.
How to check if the value is NaN
There are two ways in which we can check if the value is NaN. One is using the isNan function and the other is to use the Number.isNaN method.
Booleans are not NaN
Booleans are implemented as numerical values with a single binary digit (i.e., 0 & 1). Hence they are treated as numbers.
Summary
When a proper number cannot be the result of numerical operations, then the result is NaN. For Example, converting a string to a number. NaN is a primitive number. The NaN can appear when you convert an Invalid value to a number, Divide Zero by Zero, Some operations involving infinity & all Operations involving NaN, etc.
Extremely Deep Check If Is Empty
This last one goes a bit deep, even checking if an Object is full of blank Objects. I'm sure it has room for improvement and possible pits, but so far, it appears to catch most everything.
Short answer
Just use distance || 0 when you want to be sure you value is a proper number or isNaN () to check it.
Long answer
The NaN (Not-a-Number) is a weirdo Global Object in javascript frequently returned when some mathematical operation failed.
Introduction to Javascript Nan
- Generally, NaN means Not a Number; it’s most probably used to indicate whether the method contains either error or any exceptions that occurred in the condition loop for the functions. It should be returned with the any type of number; it should be a valid one because if suppose we are using invalid numbers, it automatically converted into 0 with t...
Checking If A Value Is Nan
Why Use Nan
Operations Return Nan
- JavaScript has the number type that allows you to represent numbers including integer and floating-point numbers. And JavaScript number has a special value called NaN, which stands for Not-a–Number. The NaN is a property of the global object. The global object is the window object in web browsers: And the global object in Node.js. The NaN has the type numberas shown in th…
Summary
- JavaScript provides you with the global function isNaN() that returns true if its argument is NaN: For example: