has-value

has-value

Returns true if a value exists, false if empty. Works with deeply nested values using object paths.

• Install
• Related projects
• Usage
• isEmpty
• Contributing
• Running tests
• Author
• License

Works for:

• booleans
• functions
• numbers (pass true as the last arg to treat zero as a value instead of falsey)
• strings
• nulls
• object
• arrays

Install

Install with npm

$ npm i has-value --save

Related projects

• get-object: Get a property from an object using dot (object path) notation. | homepage
• get-property: Get a nested property or its value from an object using simple a.b.c paths. | homepage
• get-value: Use property paths ( a.b.c) to get a nested value from an object. | homepage
• set-value: Create nested values and any intermediaries using dot notation ('a.b.c') paths. | homepage

Usage

Works with nested object paths or a single value:

var hasValue = require('has-value');

hasValue({a: {b: {c: 'foo'}}} 'a.b.c');
//=> true

hasValue('a');
//=> true

hasValue('');
//=> false

hasValue(1);
//=> true

hasValue(0);
//=> false

hasValue(0, true); // pass `true` as the last arg to treat zero as a value
//=> true

hasValue({a: 'a'}});
//=> true

hasValue({}});
//=> false

hasValue(['a']);
//=> true

hasValue([]);
//=> false

hasValue(function(foo) {}); // function length/arity
//=> true

hasValue(function() {});
//=> false

hasValue(true);
hasValue(false);
//=> true

isEmpty

To do the opposite and test for empty values, do:

function isEmpty(o, isZero) {
  return !hasValue.apply(hasValue, arguments);
}

Contributing

Pull requests and stars are always welcome. For bugs and feature requests, please create an issue.

Running tests

Install dev dependencies:

$ npm i -d && npm test

Author

Jon Schlinkert

• github/jonschlinkert
• twitter/jonschlinkert

License

Copyright © 2014-2015 Jon Schlinkert Released under the MIT license.

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This file was generated by verb-cli on October 30, 2015.