129 lines
3.9 KiB
Markdown
129 lines
3.9 KiB
Markdown
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# has-values [](https://www.npmjs.com/package/has-values) [](https://npmjs.org/package/has-values) [](https://npmjs.org/package/has-values) [](https://travis-ci.org/jonschlinkert/has-values)
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> Returns true if any values exist, false if empty. Works for booleans, functions, numbers, strings, nulls, objects and arrays.
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## Install
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Install with [npm](https://www.npmjs.com/):
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```sh
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$ npm install --save has-values
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```
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## Usage
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```js
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var hasValue = require('has-values');
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hasValue('a');
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//=> true
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hasValue('');
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//=> false
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hasValue(1);
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//=> true
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hasValue(0);
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//=> false
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hasValue({a: 'a'}});
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//=> true
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hasValue({});
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hasValue({foo: undefined});
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//=> false
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hasValue({foo: null});
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//=> true
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hasValue(['a']);
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//=> true
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hasValue([]);
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hasValue([[], []]);
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hasValue([[[]]]);
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//=> false
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hasValue(['foo']);
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hasValue([0]);
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//=> true
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hasValue(function(foo) {});
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//=> true
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hasValue(function() {});
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//=> true
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hasValue(true);
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//=> true
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hasValue(false);
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//=> true
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```
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## isEmpty
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To test for empty values, do:
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```js
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function isEmpty(o, isZero) {
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return !hasValue(o, isZero);
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}
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```
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## Release history
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### v1.0.0
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* `zero` always returns true
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* `array` now recurses, so that an array of empty arrays will return `false`
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* `null` now returns true
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## About
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### Related projects
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* [has-value](https://www.npmjs.com/package/has-value): Returns true if a value exists, false if empty. Works with deeply nested values using… [more](https://github.com/jonschlinkert/has-value) | [homepage](https://github.com/jonschlinkert/has-value "Returns true if a value exists, false if empty. Works with deeply nested values using object paths.")
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* [is-number](https://www.npmjs.com/package/is-number): Returns true if the value is a number. comprehensive tests. | [homepage](https://github.com/jonschlinkert/is-number "Returns true if the value is a number. comprehensive tests.")
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* [is-plain-object](https://www.npmjs.com/package/is-plain-object): Returns true if an object was created by the `Object` constructor. | [homepage](https://github.com/jonschlinkert/is-plain-object "Returns true if an object was created by the `Object` constructor.")
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* [isobject](https://www.npmjs.com/package/isobject): Returns true if the value is an object and not an array or null. | [homepage](https://github.com/jonschlinkert/isobject "Returns true if the value is an object and not an array or null.")
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* [kind-of](https://www.npmjs.com/package/kind-of): Get the native type of a value. | [homepage](https://github.com/jonschlinkert/kind-of "Get the native type of a value.")
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### Contributing
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Pull requests and stars are always welcome. For bugs and feature requests, [please create an issue](../../issues/new).
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### Building docs
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_(This project's readme.md is generated by [verb](https://github.com/verbose/verb-generate-readme), please don't edit the readme directly. Any changes to the readme must be made in the [.verb.md](.verb.md) readme template.)_
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To generate the readme, run the following command:
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```sh
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$ npm install -g verbose/verb#dev verb-generate-readme && verb
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```
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### Running tests
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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:
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```sh
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$ npm install && npm test
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```
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### Author
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**Jon Schlinkert**
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* [github/jonschlinkert](https://github.com/jonschlinkert)
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* [twitter/jonschlinkert](https://twitter.com/jonschlinkert)
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### License
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Copyright © 2017, [Jon Schlinkert](https://github.com/jonschlinkert).
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Released under the [MIT License](LICENSE).
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***
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_This file was generated by [verb-generate-readme](https://github.com/verbose/verb-generate-readme), v0.6.0, on May 19, 2017._
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