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"readme": "# 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)\n\n> Returns true if a value exists, false if empty. Works with deeply nested values using object paths.\n\nPlease consider following this project's author, [Jon Schlinkert](https://github.com/jonschlinkert), and consider starring the project to show your :heart: and support.\n\n## Install\n\nInstall with [npm](https://www.npmjs.com/):\n\n```sh\n$ npm install --save has-value\n```\n\n## Heads up!\n\nBreaking changes in v2.0! See the [release history](#release-history) for details.\n\n## Usage\n\n```js\nconst has = require('has-value');\n\nconsole.log(has()) //=> true\nconsole.log(has('foo')) //=> true\n```\n\n**Works for:**\n\n* booleans\n* functions\n* numbers\n* strings\n* nulls\n* object\n* arrays\n\n**isEmpty**\n\nTo do the opposite and test for empty values, do:\n\n```js\nconst isEmpty = (...args) => !has(...args);\n```\n\n## Supported types\n\n### Arrays\n\n```js\nconsole.log(has({ foo: { bar: ['a'] } }, 'foo.bar')); //=> true\nconsole.log(has({ foo: { bar: [0] } }, 'foo.bar')); //=> true\nconsole.log(has({ foo: { bar: [[[]]] } }, 'foo.bar')); //=> false\nconsole.log(has({ foo: { bar: [[], []] } }, 'foo.bar')); //=> false\nconsole.log(has({ foo: { bar: [] } }, 'foo.bar')); //=> false\n```\n\n### Booleans\n\n```js\nconsole.log(has({ foo: { bar: true } }, 'foo.bar')); //=> true\nconsole.log(has({ foo: { bar: false } }, 'foo.bar')); //=> true\n```\n\n### Buffers\n\n```js\nconsole.log(has({ foo: { bar: new Buffer() } }, 'foo.bar')); //=> false\nconsole.log(has({ foo: { bar: new Buffer('foo') } }, 'foo.bar')); //=> true\n```\n\n### Dates\n\nDates are always true.\n\n```js\nconsole.log(has({ foo: { bar: new Date() } }, 'foo.bar')); //=> true\n```\n\n### Errors\n\nReturns `false` if `err.message` is an empty string.\n\n```js\nconsole.log(has({ foo: { bar: new Error() } }, 'foo.bar')); //=> false\nconsole.log(has({ foo: { bar: new Error('foo') } }, 'foo.bar')); //=> true\n```\n\n### Functions\n\nFunctions are always true.\n\n```js\nconsole.log(has({ foo: { bar: function(foo) {} } }, 'foo.bar')); //=> true\nconsole.log(has({ foo: { bar: function() {} } }, 'foo.bar')); //=> true\n```\n\n### Maps\n\n```js\nconsole.log(has({ foo: { bar: new Map() } }, 'foo.bar')); //=> false\nconsole.log(has({ foo: { bar: new Map([['foo', 'bar']]) } }, 'foo.bar')); //=> true\n```\n\n### Null\n\n`null` is always true, as it's assumed that this is a user-defined value, versus `undefined` which is not.\n\n```js\nconsole.log(has({ foo: { bar: null } }, 'foo.bar')); //=> true\n```\n\n### Objects\n\n```js\nconsole.log(has({ foo: { bar: {} } }, 'foo.bar')); //=> false\nconsole.log(has({ foo: { bar: { a: 'a' }} } }, 'foo.bar')); //=> true\nconsole.log(has({ foo: { bar: { foo: undefined } } }, 'foo.bar')); //=> false\nconsole.log(has({ foo: { bar: { foo: null } } }, 'foo.bar')); //=> true\n```\n\n### Numbers\n\n```js\nconsole.log(has({ foo: { bar: 1 } }, 'foo.bar')); //=> true\nconsole.log(has({ foo: { bar: 0 } }, 'foo.bar')); //=> true\n```\n\n### Regular expressions\n\n```js\nconsole.log(has({ foo: { bar: new RegExp() } }, 'foo.bar')); //=> false\nconsole.log(has({ foo: { bar: new RegExp('foo') } }, 'foo.bar')); //=> true\n```\n\n### Sets\n\n```js\nconsole.log(has({ foo: { bar: new Set() } }, 'foo.bar')); //=> false\nconsole.log(has({ foo: { bar: new Set(['foo', 'bar']) } }, 'foo.bar')); //=> true\n```\n\n### Strings\n\n```js\nconsole.log(has({ foo: { bar: 'a' } }, 'foo.bar')); //=> true\nconsole.log(has({ foo: { bar: '' } }, 'foo.bar')); //=> false\n```\n\n## Undefined\n\n```js\nconsole.log(has({ foo: { bar: } }, 'foo.bar')); //=> false\nconsole.log(has({ foo: { bar: void 0 } }, 'foo.bar')); //=> false\nconsole.log(has({ foo: { bar: undefined } }, 'foo.bar')); //=> false\n```\n\n## Release history\n\n### v2.0.0\n\n**Breaking changes**\n\n* Now returns false if the first argument is not an object, function or array, and the second argument is not a string or array.\n\n### v1.0.0\n\n* `zero` always returns true\n* `array` now recurses, so that an array of empty arrays will return `false`\n* `null` now returns true\n\n## About\n\n\nContributing
\n\nPull requests and stars are always welcome. For bugs and feature requests, [please create an issue](../../issues/new).\n\n \n\n\nRunning Tests
\n\nRunning 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:\n\n```sh\n$ npm install && npm test\n```\n\n \n\n\nBuilding docs
\n\n_(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.)_\n\nTo generate the readme, run the following command:\n\n```sh\n$ npm install -g verbose/verb#dev verb-generate-readme && verb\n```\n\n \n\n### Related projects\n\nYou might also be interested in these projects:\n\n* [define-property](https://www.npmjs.com/package/define-property): Define a non-enumerable property on an object. Uses Reflect.defineProperty when available, otherwise Object.defineProperty. | [homepage](https://github.com/jonschlinkert/define-property \"Define a non-enumerable property on an object. Uses Reflect.defineProperty when available, otherwise Object.defineProperty.\")\n* [get-value](https://www.npmjs.com/package/get-value): Use property paths like 'a.b.c' to get a nested value from an object. Even works… [more](https://github.com/jonschlinkert/get-value) | [homepage](https://github.com/jonschlinkert/get-value \"Use property paths like 'a.b.c' to get a nested value from an object. Even works when keys have dots in them (no other dot-prop library can do this!).\")\n* [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.\")\n* [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.\")\n\n### Contributors\n\n| **Commits** | **Contributor** | \n| --- | --- |\n| 32 | [jonschlinkert](https://github.com/jonschlinkert) |\n| 2 | [rmharrison](https://github.com/rmharrison) |\n| 1 | [wtgtybhertgeghgtwtg](https://github.com/wtgtybhertgeghgtwtg) |\n\n### Author\n\n**Jon Schlinkert**\n\n* [LinkedIn Profile](https://linkedin.com/in/jonschlinkert)\n* [GitHub Profile](https://github.com/jonschlinkert)\n* [Twitter Profile](https://twitter.com/jonschlinkert)\n\n### License\n\nCopyright © 2018, [Jon Schlinkert](https://github.com/jonschlinkert).\nReleased under the [MIT License](LICENSE).\n\n***\n\n_This file was generated by [verb-generate-readme](https://github.com/verbose/verb-generate-readme), v0.6.0, on March 03, 2018._"
}