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 the datatype of Nan in JavaScript?
05/11/2013 · function myNaN (b) { if (typeof (b) == 'number') { // execute some code } } Whenever I call this function it works fine and passes the if condition if number is being passed. However when I pass a NaN (which is the output of some other function) to this function the if condition returns true.
Why does typeof Nan return a number?
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.Nan property. Syntax NaN Return Value NaN Browser Support NaN is an ECMAScript1 (ES1) feature. ES1 (JavaScript 1997) is fully supported in all browsers:
What is Nan in ECMAScript?
15/09/2019 · In JavaScript, the best way to check for NaN is by checking for self-equality using either of the built-in equality operators, == or ===. Because NaN is not equal to itself, NaN != NaN will always...
Is Nan a number or a type?
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What data type is NaN?
NaN , standing for not a number, is a numeric data type used to represent any value that is undefined or unpresentable. For example, 0/0 is undefined as a real number and is, therefore, represented by NaN.
Why typeof null is object JavaScript?
The reasoning behind this is that null , in contrast with undefined , was (and still is) often used where objects appear. In other words, null is often used to signify an empty reference to an object. When Brendan Eich created JavaScript, he followed the same paradigm, and it made sense (arguably) to return "object".15-Sept-2013
Is NaN check in JavaScript?
In JavaScript NaN is short for "Not-a-Number". The isNaN() method returns true if a value is NaN. The isNaN() method converts the value to a number before testing it.
What is the output of typeof NaN?
NaN stands for Not a Number. It is a value of numeric data types (usually floating point types, but not always) that represents the result of an invalid operation such as dividing by zero. Although its names says that it's not a number, the data type used to hold it is a numeric type.10-May-2010
Is typeof an array?
One type of object that is built-in to JavaScript is the array, and the typeof of an array is "object" : typeof [] === `object` // true . ECMAScript 5 introduced an Array. isArray() method to check for an array, since typeof will not be able to tell arrays from other objects.
How does JavaScript handle NaN?
How to convert NaN to 0 using JavaScript ?Using isNaN() method: The isNan() method is used to check the given number is NaN or not. ... Using || Operator: If “number” is any falsey value, it will be assigned to 0.Using ternary operator: Here number is checked via ternary operator, similar to 1, if NaN it converts to 0.More items...•15-Apr-2020
What is NaN JavaScript?
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 error in JavaScript?
NaN is an error value that means not a number. However, JavaScript considers the type of NaN to be number. Infinity is a value so big it can't be represented by JavaScript numbers. It acts mostly like mathematical infinity.25-Mar-2020
Why Does typeof Nan Return “Number”?
- 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 the help of javascript. Using th…
Computer Arithmetic Is Limited
Nan Is Unordered
Booleans Are Not Nans
- The ECMAScript standard states that Numbers should be IEEE-754 floating point data. This includes Infinity, -Infinity, and also NaN. 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, bu…