undefined-or-null

Validates if a value is undefined or null.

Installation

$ npm install validate.io-undefined-or-null

For use in the browser, use browserify.

Usage

var isUndefinedOrNull = require( 'validate.io-undefined-or-null' );

isUndefinedOrNull( value )

Validates if a value is undefined or null.

var value = null;

var bool = isUndefinedOrNull( value );
// returns true

Examples

var isUndefinedOrNull = require( 'validate.io-undefined-or-null' );

console.log( isUndefinedOrNull( undefined ) );
// returns true

console.log( isUndefinedOrNull( void 0 ) );
// returns true

console.log( isUndefinedOrNull( null ) );
// returns true

console.log( isUndefinedOrNull( false ) );
// returns false

console.log( isUndefinedOrNull( {} ) );
// returns false

console.log( isUndefinedOrNull( '' ) );
// returns false

console.log( isUndefinedOrNull( 0 ) );
// returns false

console.log( isUndefinedOrNull( [] ) );
// returns false

To run the example code from the top-level application directory,

$ node ./examples/index.js

Tests

Unit

Unit tests use the Mocha test framework with Chai assertions. To run the tests, execute the following command in the top-level application directory:

$ make test

All new feature development should have corresponding unit tests to validate correct functionality.

Test Coverage

This repository uses Istanbul as its code coverage tool. To generate a test coverage report, execute the following command in the top-level application directory:

$ make test-cov

Istanbul creates a ./reports/coverage directory. To access an HTML version of the report,

$ make view-cov

License

MIT license.

Copyright

Copyright © 2015. Athan Reines.