has-values
Returns true if any values exist, false if empty. Works for booleans, functions, numbers, strings, nulls, objects and arrays.
Please consider following this project's author, Jon Schlinkert, and consider starring the project to show your :heart: and support.
Install
Install with npm:
$ npm install --save has-values
Usage
const has = require('has-values');
Create an isEmpty
function by returning the inverse of the result from has-values:
const isEmpty = val => !has(val);
Supported types
Arrays
console.log(has(['a']));
console.log(has([0]));
console.log(has([[[]]]));
console.log(has([[], []]));
console.log(has([]));
Booleans
console.log(has(true));
console.log(has(false));
Buffers
console.log(has(new Buffer()));
console.log(has(new Buffer('foo')));
Dates
Dates are always true.
console.log(has(new Date()));
Errors
Returns false
if err.message
is an empty string.
console.log(has(new Error()));
console.log(has(new Error('foo')));
Functions
Functions are always true.
console.log(has(function(foo) {}));
console.log(has(function() {}));
Maps
console.log(has(new Map()));
console.log(has(new Map([['foo', 'bar']])));
Null
null
is always true, as it's assumed that this is a user-defined value, versus undefined
which is not.
console.log(has(null));
Objects
console.log(has({}));
console.log(has({ a: 'a' }}));
console.log(has({ foo: undefined }));
console.log(has({ foo: null }));
Numbers
console.log(has(1));
console.log(has(0));
Regular expressions
console.log(has(new RegExp()));
console.log(has(new RegExp('foo')));
Sets
console.log(has(new Set()));
console.log(has(new Set(['foo', 'bar'])));
Strings
console.log(has('a'));
console.log(has(''));
Undefined
console.log(has());
console.log(has(void 0));
console.log(has(undefined));
Release history
v2.0.0
- no longer supports numbers as a string
- optimizations
- adds support for
regex
and buffer
v1.0.0
- adds support for
Map
and Set
zero
always returns truearray
now recurses, so that an array of empty arrays will return false
null
now returns true
About
Contributing
Pull requests and stars are always welcome. For bugs and feature requests, please create an issue.
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:
$ npm install && npm test
Building docs
(This project's readme.md is generated by verb, please don't edit the readme directly. Any changes to the readme must be made in the .verb.md readme template.)
To generate the readme, run the following command:
$ npm install -g verbose/verb
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Author
Jon Schlinkert
License
Copyright © 2018, Jon Schlinkert.
Released under the MIT License.
This file was generated by verb-generate-readme, v0.6.0, on January 30, 2018.