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# has-value [](https://www.npmjs.com/package/has-value) [](https://npmjs.org/package/has-value) [](https://npmjs.org/package/has-value) [](https://travis-ci.org/jonschlinkert/has-value) > Returns true if a value exists, false if empty. Works with deeply nested values using object paths. ## Install Install with [npm](https://www.npmjs.com/): ```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](https://www.npmjs.com/package/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](https://www.npmjs.com/package/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](https://www.npmjs.com/package/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](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](../../issues/new). ### Contributors | **Commits** | **Contributor** | | --- | --- | | 17 | [jonschlinkert](https://github.com/jonschlinkert) | | 2 | [rmharrison](https://github.com/rmharrison) | ### Building docs _(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.)_ 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](https://github.com/jonschlinkert) * [twitter/jonschlinkert](https://twitter.com/jonschlinkert) ### License Copyright © 2017, [Jon Schlinkert](https://github.com/jonschlinkert). Released under the [MIT License](LICENSE). *** _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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