isNaN

Test if a value is NaN.

Usage

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

isnan( value )

Tests if a value is NaN.

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

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

isnan.isNaNArray( value )

Tests if a value is a number array having only NaN values.

var bool = isnan.isNaNArray( [NaN,2] );
// returns false

bool = isnan.isNaNArray( [NaN,NaN,NaN] );
// returns true

isnan.isPrimitiveNaNArray( value )

Tests if a value is a primitive number array having only NaN values.

var bool = isnan.isPrimitiveNaNArray( [NaN,new Number( NaN )] );
// returns false

bool = isnan.isPrimitiveNaNArray( [NaN,NaN,NaN] );
// returns true

Examples

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

console.log( isnan( NaN ) );
// returns true

console.log( isnan( new Number( NaN ) ) );
// returns true

console.log( isnan( 5 ) );
// returns false

console.log( isnan( '5' ) );
// returns false

console.log( isnan( null ) );
// returns false

console.log( isnan( Symbol( 'NaN' ) ) );
// returns false