isNaN (Lodash Compatibility)

::: warning Use Number.isNaN

This isNaN function operates slowly due to additional function calls.

Instead, use the faster and modern Number.isNaN.

:::

Checks if a value is NaN.

typescript

const result = isNaN(value);

Usage

`isNaN(value)`

Use isNaN when you want to check if a value is NaN.

typescript

import { isNaN } from 'es-toolkit/compat';

// NaN checks
isNaN(NaN);
// Returns: true

isNaN(Number.NaN);
// Returns: true

// Other values
isNaN(undefined);
// Returns: false

isNaN(null);
// Returns: false

isNaN(0);
// Returns: false

isNaN('NaN');
// Returns: false

Parameters

value (unknown): The value to check if it's NaN.

Returns

(boolean): Returns true if the value is NaN, otherwise false.