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has-values

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has-values

Returns true if any values exist, false if empty. Works for booleans, functions, numbers, strings, nulls, objects and arrays.

    2.0.1latest

Version published
Maintainers
1
Weekly downloads
27,413,890
decreased by-10.59%

Weekly downloads

Readme

Source

has-values NPM version NPM monthly downloads NPM total downloads Linux Build Status

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'])); //=> true console.log(has([0])); //=> true console.log(has([[[]]])); //=> false console.log(has([[], []])); //=> false console.log(has([])); //=> false

Booleans

console.log(has(true)); //=> true console.log(has(false)); //=> true

Buffers

console.log(has(new Buffer())); //=> false console.log(has(new Buffer('foo'))); //=> true

Dates

Dates are always true.

console.log(has(new Date())); //=> true

Errors

Returns false if err.message is an empty string.

console.log(has(new Error())); //=> false console.log(has(new Error('foo'))); //=> true

Functions

Functions are always true.

console.log(has(function(foo) {})); //=> true console.log(has(function() {})); //=> true

Maps

console.log(has(new Map())); //=> false console.log(has(new Map([['foo', 'bar']]))); //=> true

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)); //=> true

Objects

console.log(has({})); //=> false console.log(has({ a: 'a' }})); //=> true console.log(has({ foo: undefined })); //=> false console.log(has({ foo: null })); //=> true

Numbers

console.log(has(1)); //=> true console.log(has(0)); //=> true

Regular expressions

console.log(has(new RegExp())); //=> false console.log(has(new RegExp('foo'))); //=> true

Sets

console.log(has(new Set())); //=> false console.log(has(new Set(['foo', 'bar']))); //=> true

Strings

console.log(has('a')); //=> true console.log(has('')); //=> false

Undefined

console.log(has()); //=> false console.log(has(void 0)); //=> false console.log(has(undefined)); //=> false

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 true
  • array 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#dev verb-generate-readme && verb

You might also be interested in these projects:

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.

Keywords

FAQs

What is has-values?

Returns true if any values exist, false if empty. Works for booleans, functions, numbers, strings, nulls, objects and arrays.

Is has-values popular?

The npm package has-values receives a total of 21,075,730 weekly downloads. As such, has-values popularity was classified as popular.

Is has-values well maintained?

We found that has-values demonstrated a not healthy version release cadence and project activity because the last version was released a year ago.It has 1 open source maintainer collaborating on the project.

Last updated on 31 Jan 2018

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