is_nan.json

{
    "id": "is_nan",
    "summary": "Value is not a number",
    "description": "Checks whether the specified value `x` carries the special value `NaN` (not a number) as defined by the [IEEE Standard 754](https://ieeexplore.ieee.org/document/4610935), in which case it returns `true`. Returns `false` otherwise.",
    "categories": [
        "comparison",
        "math > constants"
    ],
    "parameters": [
        {
            "name": "x",
            "description": "The data to check.",
            "schema": {
                "description": "Any data type is allowed."
            }
        }
    ],
    "returns": {
        "description": "Returns `true` for `NaN` and `false` otherwise.",
        "schema": {
            "type": "boolean"
        }
    },
    "links": [
        {
            "rel": "about",
            "href": "https://ieeexplore.ieee.org/document/4610935",
            "title": "IEEE Standard 754-2008 for Floating-Point Arithmetic"
        },
        {
            "rel": "about",
            "href": "http://mathworld.wolfram.com/NaN.html",
            "title": "NaN explained by Wolfram MathWorld"
        }
    ]
}