Returns true if any values exist, false if empty. Works for booleans, functions, numbers, strings, nulls, objects and arrays.
Last updated 2 years ago by jonschlinkert .
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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 with npm:

$ npm install --save has-values


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


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


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


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


Dates are always true.

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


Returns false if err.message is an empty string.

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


Functions are always true.

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


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


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


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


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


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


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


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

Release history


  • no longer supports numbers as a string
  • optimizations
  • adds support for regex and buffer


  • 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


<summary> Contributing</summary>

Pull requests and stars are always welcome. For bugs and feature requests, please create an issue.

<summary> Running Tests</summary>

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
<summary> Building docs</summary>

(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

Related projects

You might also be interested in these projects:


Jon Schlinkert


Copyright © 2018, Jon Schlinkert. Released under the MIT License.

This file was generated by verb-generate-readme, v0.6.0, on January 30, 2018.

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