isNumber

Test if a value is a number.

Installation

npm install @stdlib/assert-is-number

Usage

var isNumber = require( '@stdlib/assert-is-number' );

isNumber( value )

Tests if a value is a number.

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

var bool = isNumber( 3.14 );
// returns true

bool = isNumber( new Number( 3.14 ) );
// returns true

bool = isNumber( NaN );
// returns true

bool = isNumber( null );
// returns false

isNumber.isPrimitive( value )

Tests if a value is a primitive number.

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

var bool = isNumber.isPrimitive( 3.14 );
// returns true

bool = isNumber.isPrimitive( NaN );
// returns true

bool = isNumber.isPrimitive( new Number( 3.14 ) );
// returns false

isNumber.isObject( value )

Tests if a value is a Number object.

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

var bool = isNumber.isObject( 3.14 );
// returns false

bool = isNumber.isObject( new Number( 3.14 ) );
// returns true

Examples

var Number = require( '@stdlib/number-ctor' );
var isNumber = require( '@stdlib/assert-is-number' );

var bool = isNumber( 5 );
// returns true

bool = isNumber( new Number( 5 ) );
// returns true

bool = isNumber( NaN );
// returns true

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

bool = isNumber( null );
// returns false

Notice

This package is part of stdlib, a standard library for JavaScript and Node.js, with an emphasis on numerical and scientific computing. The library provides a collection of robust, high performance libraries for mathematics, statistics, streams, utilities, and more.

For more information on the project, filing bug reports and feature requests, and guidance on how to develop stdlib, see the main project repository.

Community

License

See LICENSE.

Copyright

Copyright © 2016-2024. The Stdlib Authors.