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README.md
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-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 truearray
now recurses, so that an array of empty arrays will returnfalse
null
now 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 && 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.
This file was generated by verb-generate-readme, v0.6.0, on May 19, 2017.