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 ❤️ and support.
Install with npm:
$ npm install --save has-valuesconst has = require('has-values');Create an isEmpty function by returning the inverse of the result from has-values:
const isEmpty = val => !has(val);console.log(has(['a'])); //=> true
console.log(has([0])); //=> true
console.log(has([[[]]])); //=> false
console.log(has([[], []])); //=> false
console.log(has([])); //=> falseconsole.log(has(true)); //=> true
console.log(has(false)); //=> trueconsole.log(has(new Buffer())); //=> false
console.log(has(new Buffer('foo'))); //=> trueDates are always true.
console.log(has(new Date())); //=> trueReturns false if err.message is an empty string.
console.log(has(new Error())); //=> false
console.log(has(new Error('foo'))); //=> trueFunctions are always true.
console.log(has(function(foo) {})); //=> true
console.log(has(function() {})); //=> trueconsole.log(has(new Map())); //=> false
console.log(has(new Map([['foo', 'bar']]))); //=> truenull is always true, as it's assumed that this is a user-defined value, versus undefined which is not.
console.log(has(null)); //=> trueconsole.log(has({})); //=> false
console.log(has({ a: 'a' }})); //=> true
console.log(has({ foo: undefined })); //=> false
console.log(has({ foo: null })); //=> trueconsole.log(has(1)); //=> true
console.log(has(0)); //=> trueconsole.log(has(new RegExp())); //=> false
console.log(has(new RegExp('foo'))); //=> trueconsole.log(has(new Set())); //=> false
console.log(has(new Set(['foo', 'bar']))); //=> trueconsole.log(has('a')); //=> true
console.log(has('')); //=> falseconsole.log(has()); //=> false
console.log(has(void 0)); //=> false
console.log(has(undefined)); //=> false- no longer supports numbers as a string
- optimizations
- adds support for
regexandbuffer
- adds support for
MapandSet zeroalways returns truearraynow recurses, so that an array of empty arrays will returnfalsenullnow returns true
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 testBuilding 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 && verbYou might also be interested in these projects:
- has-value: Returns true if a value exists, false if empty. Works with deeply nested values using… more | homepage
- is-number: Returns true if the value is a number. comprehensive tests. | homepage
- is-plain-object: Returns true if an object was created by the
Objectconstructor. | homepage - isobject: Returns true if the value is an object and not an array or null. | homepage
- kind-of: Get the native type of a value. | homepage
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.