What is has-values?
The has-values npm package is a utility that checks if a value exists and is not empty. It can be used to validate objects, arrays, strings, and other data types to ensure they contain meaningful data.
What are has-values's main functionalities?
Check if a string has a value
This feature allows you to check if a string is non-empty. It returns true if the string has a value and false if it is empty.
const hasValues = require('has-values');
console.log(hasValues('hello'));
console.log(hasValues(''));
Check if an array has values
This feature checks if an array contains any elements. It returns true if the array has elements and false if it is empty.
const hasValues = require('has-values');
console.log(hasValues([1, 2, 3]));
console.log(hasValues([]));
Check if an object has values
This feature checks if an object has any properties. It returns true if the object has properties and false if it is empty.
const hasValues = require('has-values');
console.log(hasValues({a: 1, b: 2}));
console.log(hasValues({}));
Check if a nested object has values
This feature checks if a nested object contains any values. It returns true if the nested object has values and false if it is empty.
const hasValues = require('has-values');
console.log(hasValues({a: {b: 2}}));
console.log(hasValues({a: {}}));
Other packages similar to has-values
lodash
Lodash is a popular utility library that provides a wide range of functions for manipulating and validating data. It includes methods like _.isEmpty, which can be used to check if a value is empty, similar to has-values.
underscore
Underscore is another utility library that offers a variety of functions for working with arrays, objects, and other data types. It includes the _.isEmpty method, which serves a similar purpose to has-values by checking if a value is empty.
validator
Validator is a library focused on string validation and sanitization. It includes functions like isEmpty, which can be used to check if a string is empty, similar to the functionality provided by has-values.
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 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
Related projects
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.