isNaN

Test if a value is NaN.

Usage

var isnan = require( '@stdlib/assert/is-nan' );

isnan( value )

Tests if a value is NaN.

var Number = require( '@stdlib/number/ctor' );

var bool = isnan( NaN );
// returns true

bool = isnan( new Number( NaN ) );
// returns true

bool = isnan( 3.14 );
// returns false

bool = isnan( null );
// returns false

isnan.isPrimitive( value )

Tests if a value is a NaN primitive number.

var Number = require( '@stdlib/number/ctor' );

var bool = isnan.isPrimitive( NaN );
// returns true

bool = isnan.isPrimitive( 3.14 );
// returns false

bool = isnan.isPrimitive( new Number( NaN ) );
// returns false

isnan.isObject( value )

Tests if a value is a Number object having a value of NaN.

var Number = require( '@stdlib/number/ctor' );

var bool = isnan.isObject( NaN );
// returns false

bool = isnan.isObject( new Number( NaN ) );
// returns true

Examples

var Number = require( '@stdlib/number/ctor' );
var Symbol = require( '@stdlib/symbol/ctor' );
var isnan = require( '@stdlib/assert/is-nan' );

var bool = isnan( NaN );
// returns true

bool = isnan( new Number( NaN ) );
// returns true

bool = isnan( 5 );
// returns false

bool = isnan( '5' );
// returns false

bool = isnan( null );
// returns false

bool = isnan( Symbol( 'NaN' ) );
// returns false