isFalsy

Test if a value is falsy.

Installation

npm install @stdlib/assert-is-falsy

Usage

var isFalsy = require( '@stdlib/assert-is-falsy' );

isFalsy( value )

Tests if a value is a value which translates to false when evaluated in a boolean context.

var bool = isFalsy( false );
// returns true

bool = isFalsy( '' );
// returns true

bool = isFalsy( 0 );
// returns true

bool = isFalsy( NaN );
// returns true

bool = isFalsy( null );
// returns true

bool = isFalsy( void 0 );
// returns true

bool = isFalsy( [] );
// returns false

Examples

var isFalsy = require( '@stdlib/assert-is-falsy' );

var bool = isFalsy( false );
// returns true

bool = isFalsy( 0 );
// returns true

bool = isFalsy( NaN );
// returns true

bool = isFalsy( '' );
// returns true

bool = isFalsy( void 0 );
// returns true

bool = isFalsy( null );
// returns true

bool = isFalsy( 'beep' );
// returns false

bool = isFalsy( 5 );
// returns false

bool = isFalsy( true );
// returns false

bool = isFalsy( [] );
// returns false

bool = isFalsy( {} );
// returns false

bool = isFalsy( function foo() {} );
// returns false

See Also

• @stdlib/assert-is-falsy-array: test if a value is an array-like object containing only falsy values.
• @stdlib/assert-is-truthy: test if a value is truthy.

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.