StackGenVis: Alignment of Data, Algorithms, and Models for Stacking Ensemble Learning Using Performance Metrics
https://doi.org/10.1109/TVCG.2020.3030352
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136 lines
4.3 KiB
136 lines
4.3 KiB
4 years ago
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# falsey [](https://www.npmjs.com/package/falsey) [](https://npmjs.org/package/falsey) [](https://npmjs.org/package/falsey) [](https://travis-ci.org/jonschlinkert/falsey) [](https://ci.appveyor.com/project/jonschlinkert/falsey)
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> Returns true if `value` is falsey. Works for strings, arrays and `arguments` objects with a length of `0`, and objects with no own enumerable properties are considered falsey.
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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 falsey
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```
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What makes this lib unique (and fun) is the option to pass an array of values that should always evuate as "falsey".
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This is useful for CLI prompts, web forms, etc. For example, you might want to allow users to define `nil` or `nope` to disable something.
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## Usage
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```js
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var isFalsey = require('falsey');
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console.log(isFalsey('nil');
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//=> `true`
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```
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## Examples
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All of the following return `true`
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```js
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isFalsey(undefined);
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isFalsey(null);
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isFalsey(false);
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isFalsey(0);
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isFalsey('');
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isFalsey(NaN);
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isFalsey({});
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isFalsey([]);
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```
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All of the following return `false`:
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```js
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isFalsey('foo');
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isFalsey(true);
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isFalsey(50);
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isFalsey('10');
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isFalsey({a: 'b'});
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isFalsey([0]);
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```
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### Special cases
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There are several additional "falsey" words built in, but these can be overridden or turned off by passing a value as the second argument.
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**Built-in additional falsey keywords**
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* `none`
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* `nil`
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* `nope`
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* `no`
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* `nada`
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* `0`
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* `false`
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**Disable additions**
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```js
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isFalsey('nil', []);
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//=> false
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```
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**Customize additions**
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Pass one or more keywords that should return `true` when evaluated as _falsey_:
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```js
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isFalsey('zilch', ['no', 'nope', 'nada', 'zilch']);
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//=> true
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```
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**Extend additions**
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Built-in keywords are exposed on the `.keywords` property. These can be used to extend the defaults:
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```js
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isFalsey('zilch', isFalsey.keywords.concat(['zilch']));
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//=> true
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```
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## About
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### Related projects
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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-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. ")
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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 September 11, 2017._
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