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has-value

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

# Install

Install with npm:

$ 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:

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:

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
- 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 (</tt>'a.b.c'`) paths.")`
- `[unset-value](https://www.npmjs.com/package/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.`

``

## Contributors

``

Commits | Contributor
--- | ---
17 | jonschlinkert
2 | rmharrison

``

## 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 readme template.)_`

`To generate the readme, run the following command:`

``

$ 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:`

``

$ 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.`