has-value    

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

Install

Install with npm:

sh
$ npm install --save has-value

Works for:

• booleans
• functions
• numbers
• strings
• nulls
• object
• arrays

Usage

Works with property values (supports object-path notation, like foo.bar) or a single value:

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

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

hasValue('');
hasValue({foo: ''}, 'foo');
//=> false

hasValue(0);
hasValue(1);
hasValue({foo: 0}, 'foo');
hasValue({foo: 1}, 'foo');
hasValue({foo: null}, 'foo');
hasValue({foo: {bar: 'a'}}}, 'foo');
hasValue({foo: {bar: 'a'}}}, 'foo.bar');
//=> true

hasValue({foo: {}}}, 'foo');
hasValue({foo: {bar: {}}}}, 'foo.bar');
hasValue({foo: undefined}, 'foo');
//=> false

hasValue([]);
hasValue([[]]);
hasValue([[], []]);
hasValue([undefined]);
hasValue({foo: []}, 'foo');
//=> false

hasValue([0]);
hasValue([null]);
hasValue(['foo']);
hasValue({foo: ['a']}, 'foo');
//=> true

hasValue(function() {})
hasValue(function(foo) {})
hasValue({foo: function(foo) {}}, 'foo'); 
hasValue({foo: function() {}}, 'foo');
//=> true

hasValue(true);
hasValue(false);
hasValue({foo: true}, 'foo');
hasValue({foo: false}, 'foo');
//=> true

isEmpty

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

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

Release history

v1.0.0

• zero always returns true
• array now recurses, so that an array of empty arrays will return false
• null now returns true

About

Related projects

• define-property: Define a non-enumerable property on an object. | [homepage](https://github.com/jonschlinkert/define-property "Define a non-enumerable property on an object.")
• get-value: Use property paths (a.b.c) to get a nested value from an object. | [homepage](https://github.com/jonschlinkert/get-value "Use property paths (a.b.c) to get a nested value from an object.")
• set-value: Create nested values and any intermediaries using dot notation ('a.b.c') paths. | [homepage](https://github.com/jonschlinkert/set-value "Create nested values and any intermediaries using dot notation ('a.b.c') paths.")
• unset-value: Delete nested properties from an object using dot notation. | [homepage](https://github.com/jonschlinkert/unset-value "Delete nested properties from an object using dot notation.")

Contributing

Pull requests and stars are always welcome. For bugs and feature requests, [please create an issue](../../issues/new).

Contributors

Building docs

_(This project's readme.md is generated by verb, please don't edit the readme directly. Any changes to the readme must be made in the [.verb.md](.verb.md) readme template.)_

To generate the readme, run the following command:

sh
$ npm install -g verbose/verb#dev verb-generate-readme && verb

Running tests

Running and reviewing unit tests is a great way to get familiarized with a library and its API. You can install dependencies and run tests with the following command:

sh
$ npm install && npm test

Author

Jon Schlinkert

• github/jonschlinkert
• twitter/jonschlinkert

License

Copyright © 2017, Jon Schlinkert. Released under the [MIT License](LICENSE).

_This file was generated by verb-generate-readme, v0.6.0, on May 19, 2017._