has-value 
#
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-valueWorks 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');
//=> trueisEmpty#
To do the opposite and test for empty values, do:
function isEmpty(o) {
return !hasValue.apply(hasValue, arguments);
}Release history#
v1.0.0#
zeroalways returns truearraynow recurses, so that an array of empty arrays will returnfalsenullnow returns true
About#
Related projects#
- define-property: Define a non-enumerable property on an object. | homepage
- get-value: Use property paths (
a.b.c) to get a nested value from an object. | homepage - set-value: Create nested values and any intermediaries using dot notation (
'a.b.c') paths. | homepage - unset-value: Delete nested properties from an object using dot notation. | homepage
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 && verbRunning 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 testAuthor#
Jon Schlinkert
License#
Copyright © 2017, Jon Schlinkert.
Released under the MIT License.
This file was generated by verb-generate-readme, v0.6.0, on May 19, 2017.