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Returns true if a value exists, false if empty. Works with deeply nested values using object paths.

Install

Install with npm:

$ npm install --save has-value

Works for:

  • booleans
  • functions
  • numbers
  • strings
  • nulls
  • object
  • arrays

Usage

Works with property values (supports object-path notation, like foo.bar) or a single value:

var hasValue = require('has-value');
hasValue('foo');
hasValue({foo: 'bar'}, 'foo');
hasValue({a: {b: {c: 'foo'}}}, 'a.b.c');
//=> true
hasValue('');
hasValue({foo: ''}, 'foo');
//=> false
hasValue(0);
hasValue(1);
hasValue({foo: 0}, 'foo');
hasValue({foo: 1}, 'foo');
hasValue({foo: null}, 'foo');
hasValue({foo: {bar: 'a'}}}, 'foo');
hasValue({foo: {bar: 'a'}}}, 'foo.bar');
//=> true
hasValue({foo: {}}}, 'foo');
hasValue({foo: {bar: {}}}}, 'foo.bar');
hasValue({foo: undefined}, 'foo');
//=> false
hasValue([]);
hasValue([[]]);
hasValue([[], []]);
hasValue([undefined]);
hasValue({foo: []}, 'foo');
//=> false
hasValue([0]);
hasValue([null]);
hasValue(['foo']);
hasValue({foo: ['a']}, 'foo');
//=> true
hasValue(function() {})
hasValue(function(foo) {})
hasValue({foo: function(foo) {}}, 'foo');
hasValue({foo: function() {}}, 'foo');
//=> true
hasValue(true);
hasValue(false);
hasValue({foo: true}, 'foo');
hasValue({foo: false}, 'foo');
//=> true

isEmpty

To do the opposite and test for empty values, do:

function isEmpty(o) {
return !hasValue.apply(hasValue, arguments);
}

Release history

v1.0.0

  • zero always returns true
  • array now recurses, so that an array of empty arrays will return false
  • null now returns true

About

Related projects

Contributing

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

Contributors

Commits Contributor
17 jonschlinkert
2 rmharrison

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

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

Author

Jon Schlinkert

License

Copyright © 2017, Jon Schlinkert. Released under the [MIT License](LICENSE).


This file was generated by verb-generate-readme, v0.6.0, on May 19, 2017.