simple-squiggle/node_modules/mathjs/docs/reference/functions/isNaN.md

Function isNaN

Test whether a value is NaN (not a number). The function supports types number, BigNumber, Fraction, Unit and Complex.

The function is evaluated element-wise in case of Array or Matrix input.

Syntax

math.isNaN(x)

Parameters

Parameter	Type	Description
x	number | BigNumber | Fraction | Unit | Array | Matrix	Value to be tested

Returns

Type	Description
boolean	Returns true when x is NaN. Throws an error in case of an unknown data type.

Throws

Type	Description

Examples

math.isNaN(3)                     // returns false
math.isNaN(NaN)                   // returns true
math.isNaN(0)                     // returns false
math.isNaN(math.bignumber(NaN))   // returns true
math.isNaN(math.bignumber(0))     // returns false
math.isNaN(math.fraction(-2, 5))  // returns false
math.isNaN('-2')                  // returns false
math.isNaN([2, 0, -3, NaN]')      // returns [false, false, false, true]

See also

isNumeric, isNegative, isPositive, isZero, isInteger