has-values

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')); // true
console.log(hasValues('')); // false

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])); // true
console.log(hasValues([])); // false

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})); // true
console.log(hasValues({})); // false

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}})); // true
console.log(hasValues({a: {}})); // false

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.

README

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']));      //=> 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

Related projects

You 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 Object constructor. | 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

Author

Jon Schlinkert

• linkedin/in/jonschlinkert
• github/jonschlinkert
• twitter/jonschlinkert

License

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

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