how to avoid nan in javascript

Avoid NaN in JavaScript

1. Mathematical operations with non-numeric string values Sometimes stringed values may come back from an API, just...
2. Mathematical operations with functions Doing mathematical operations with a function will result in a NaN value.
3. Mathematical operations with objects Doing mathematical operations with a JavaScript object will result in a...

Full Answer

How to avoid Nan error in JavaScript?

Than NaN gets produced. To avoid it completely, it’s best if you do all your mathematical operations with numbers. Sometimes stringed values may come back from an API, just check if the value is NaN in the first place.

What is NaN value in JavaScript?

Verified with Safari, Firefox and Chrome on OSX Mojave. Show activity on this post. NaN is the only value in JS which is not equals to itself so we can use this information in our favour

How do I avoid Nan in Python?

Than NaN gets produced. To avoid it completely, it’s best if you do all your mathematical operations with numbers. Sometimes stringed values may come back from an API, just check if the value is NaN in the first place. Doing mathematical operations with a function will result in a NaN value.

What is Nan and how does it work?

The way NaN works is if something goes wrong way down in some sub-sub-sub-operation (producing a NaN at that lower level), the final result will also be NaN, which you'll immediately recognize as an error even if your error handling logic (throw/catch maybe?) isn't yet complete.

Why am I getting NaN in JavaScript?

The special value NaN shows up in JavaScript when Math functions fail ( Math. sqrt(-37) ) or when a function trying to parse a number fails ( parseInt("No integers here") ). NaN then poisons all other math functions, leading to all other math operations resulting in NaN .

How do I fix my NaN code?

Nan means “Not a number”, this is because inside your cube function, you're not calling the square function, but getting it's contents. Change return x * square; with return x * square(x); and it should work.

How do I return 0 instead of NaN?

Use the logical OR (||) operator to convert NaN to 0 , e.g. const result = val || 0; . The logical OR (||) operator returns the value to the right if the value to the left is falsy. Copied! The logical OR (||) operator returns the value to the right if the value to the left is falsy.

Why is my result NaN?

This is because you are creating a totally different a inside your function with no value in it. Your first sentence is wrong, see this example - any math operations with undefined will always result in NaN.

What is error code NaN?

not a numberNaN is a common value in code that is essentially an error code telling you that that value it found is "not a number". Essentially the calculation of something failed.

Is not NaN JavaScript?

isNaN(x) is a reliable way to test whether x is NaN or not. Even with Number. isNaN , however, the meaning of NaN remains the precise numeric meaning and not, "not a number".

Is 0 A NaN?

A method or operator returns NaN when the result of an operation is undefined. For example, the result of dividing zero by zero is NaN, as the following example shows. (But note that dividing a non-zero number by zero returns either PositiveInfinity or NegativeInfinity, depending on the sign of the divisor.)

Why is isNaN null false?

Example. The isNaN(null) == false is semantically correct. This is because null is not NaN.

What is JavaScript 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. Nan property.