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:

1$ npm install --save has-values

Usage

1const has = require('has-values');

Create an isEmpty function by returning the inverse of the result from has-values:

1const isEmpty = val => !has(val);

Supported types

Arrays

1console.log(has(['a']));      //=> true
2console.log(has([0]));        //=> true
3console.log(has([[[]]]));     //=> false
4console.log(has([[], []]));   //=> false
5console.log(has([]));         //=> false

Booleans

1console.log(has(true));  //=> true
2console.log(has(false)); //=> true

Buffers

1console.log(has(new Buffer()));      //=> false
2console.log(has(new Buffer('foo'))); //=> true

Dates

Dates are always true.

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

Errors

Returns false if err.message is an empty string.

1console.log(has(new Error()));      //=> false
2console.log(has(new Error('foo'))); //=> true

Functions

Functions are always true.

1console.log(has(function(foo) {})); //=> true
2console.log(has(function() {}));    //=> true

Maps

1console.log(has(new Map()));                 //=> false
2console.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.

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

Objects

1console.log(has({})); //=> false
2console.log(has({ a: 'a' }}));        //=> true
3console.log(has({ foo: undefined })); //=> false
4console.log(has({ foo: null }));      //=> true

Numbers

1console.log(has(1)); //=> true
2console.log(has(0)); //=> true

Regular expressions

1console.log(has(new RegExp()));      //=> false
2console.log(has(new RegExp('foo'))); //=> true

Sets

1console.log(has(new Set()));               //=> false
2console.log(has(new Set(['foo', 'bar']))); //=> true

Strings

1console.log(has('a')); //=> true
2console.log(has(''));  //=> false

Undefined

1console.log(has());          //=> false
2console.log(has(void 0));    //=> false
3console.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

1$ npm install && npm test

1$ 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.

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