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"description": "Returns true if a number or string value is a finite number. Useful for regex matches, parsing, user input, etc.",
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"homepage": "https://github.com/jonschlinkert/is-number",
"author": {
"name": "Jon Schlinkert",
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"name": "Jon Schlinkert",
"url": "http://twitter.com/jonschlinkert"
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{
"name": "Olsten Larck",
"url": "https://i.am.charlike.online"
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{
"name": "Rouven Weßling",
"url": "www.rouvenwessling.de"
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"readme": "# is-number [](https://www.npmjs.com/package/is-number) [](https://npmjs.org/package/is-number) [](https://npmjs.org/package/is-number) [](https://travis-ci.org/jonschlinkert/is-number)\n\n> Returns true if the value is a finite number.\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 is-number\n```\n\n## Why is this needed?\n\nIn JavaScript, it's not always as straightforward as it should be to reliably check if a value is a number. It's common for devs to use `+`, `-`, or `Number()` to cast a string value to a number (for example, when values are returned from user input, regex matches, parsers, etc). But there are many non-intuitive edge cases that yield unexpected results:\n\n```js\nconsole.log(+[]); //=> 0\nconsole.log(+''); //=> 0\nconsole.log(+' '); //=> 0\nconsole.log(typeof NaN); //=> 'number'\n```\n\nThis library offers a performant way to smooth out edge cases like these.\n\n## Usage\n\n```js\nconst isNumber = require('is-number');\n```\n\nSee the [tests](./test.js) for more examples.\n\n### true\n\n```js\nisNumber(5e3); // true\nisNumber(0xff); // true\nisNumber(-1.1); // true\nisNumber(0); // true\nisNumber(1); // true\nisNumber(1.1); // true\nisNumber(10); // true\nisNumber(10.10); // true\nisNumber(100); // true\nisNumber('-1.1'); // true\nisNumber('0'); // true\nisNumber('012'); // true\nisNumber('0xff'); // true\nisNumber('1'); // true\nisNumber('1.1'); // true\nisNumber('10'); // true\nisNumber('10.10'); // true\nisNumber('100'); // true\nisNumber('5e3'); // true\nisNumber(parseInt('012')); // true\nisNumber(parseFloat('012')); // true\n```\n\n### False\n\nEverything else is false, as you would expect:\n\n```js\nisNumber(Infinity); // false\nisNumber(NaN); // false\nisNumber(null); // false\nisNumber(undefined); // false\nisNumber(''); // false\nisNumber(' '); // false\nisNumber('foo'); // false\nisNumber([1]); // false\nisNumber([]); // false\nisNumber(function () {}); // false\nisNumber({}); // false\n```\n\n## Release history\n\n### 7.0.0\n\n* Refactor. Now uses `.isFinite` if it exists.\n* Performance is about the same as v6.0 when the value is a string or number. But it's now 3x-4x faster when the value is not a string or number.\n\n### 6.0.0\n\n* Optimizations, thanks to @benaadams.\n\n### 5.0.0\n\n**Breaking changes**\n\n* removed support for `instanceof Number` and `instanceof String`\n\n## Benchmarks\n\nAs with all benchmarks, take these with a grain of salt. See the [benchmarks](./benchmark/index.js) for more detail.\n\n```\n# all\nv7.0 x 413,222 ops/sec ±2.02% (86 runs sampled)\nv6.0 x 111,061 ops/sec ±1.29% (85 runs sampled)\nparseFloat x 317,596 ops/sec ±1.36% (86 runs sampled)\nfastest is 'v7.0'\n\n# string\nv7.0 x 3,054,496 ops/sec ±1.05% (89 runs sampled)\nv6.0 x 2,957,781 ops/sec ±0.98% (88 runs sampled)\nparseFloat x 3,071,060 ops/sec ±1.13% (88 runs sampled)\nfastest is 'parseFloat,v7.0'\n\n# number\nv7.0 x 3,146,895 ops/sec ±0.89% (89 runs sampled)\nv6.0 x 3,214,038 ops/sec ±1.07% (89 runs sampled)\nparseFloat x 3,077,588 ops/sec ±1.07% (87 runs sampled)\nfastest is 'v6.0'\n```\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* [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.\")\n* [is-primitive](https://www.npmjs.com/package/is-primitive): Returns `true` if the value is a primitive. | [homepage](https://github.com/jonschlinkert/is-primitive \"Returns `true` if the value is a primitive. \")\n* [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.\")\n* [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.\")\n\n### Contributors\n\n| **Commits** | **Contributor** | \n| --- | --- |\n| 49 | [jonschlinkert](https://github.com/jonschlinkert) |\n| 5 | [charlike-old](https://github.com/charlike-old) |\n| 1 | [benaadams](https://github.com/benaadams) |\n| 1 | [realityking](https://github.com/realityking) |\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 June 15, 2018._",
"licenseText": "The MIT License (MIT)\n\nCopyright (c) 2014-present, Jon Schlinkert.\n\nPermission is hereby granted, free of charge, to any person obtaining a copy\nof this software and associated documentation files (the \"Software\"), to deal\nin the Software without restriction, including without limitation the rights\nto use, copy, modify, merge, publish, distribute, sublicense, and/or sell\ncopies of the Software, and to permit persons to whom the Software is\nfurnished to do so, subject to the following conditions:\n\nThe above copyright notice and this permission notice shall be included in\nall copies or substantial portions of the Software.\n\nTHE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\nIMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\nFITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE\nAUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\nLIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\nOUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN\nTHE SOFTWARE.\n"
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