has-value
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Returns true if a value exists, false if empty. Works with deeply nested values using object paths.
Please consider following this project's author, Jon Schlinkert, and consider starring the project to show your :heart: and support.
Install with npm:
$ npm install --save has-value
Breaking changes in v2.0! See the release history for details.
const has = require('has-value');
console.log(has()) //=> true
console.log(has('foo')) //=> true
Works for:
isEmpty
To do the opposite and test for empty values, do:
const isEmpty = (...args) => !has(...args);
console.log(has({ foo: { bar: ['a'] } }, 'foo.bar')); //=> true
console.log(has({ foo: { bar: [0] } }, 'foo.bar')); //=> true
console.log(has({ foo: { bar: [[[]]] } }, 'foo.bar')); //=> false
console.log(has({ foo: { bar: [[], []] } }, 'foo.bar')); //=> false
console.log(has({ foo: { bar: [] } }, 'foo.bar')); //=> false
console.log(has({ foo: { bar: true } }, 'foo.bar')); //=> true
console.log(has({ foo: { bar: false } }, 'foo.bar')); //=> true
console.log(has({ foo: { bar: new Buffer() } }, 'foo.bar')); //=> false
console.log(has({ foo: { bar: new Buffer('foo') } }, 'foo.bar')); //=> true
Dates are always true.
console.log(has({ foo: { bar: new Date() } }, 'foo.bar')); //=> true
Returns false
if err.message
is an empty string.
console.log(has({ foo: { bar: new Error() } }, 'foo.bar')); //=> false
console.log(has({ foo: { bar: new Error('foo') } }, 'foo.bar')); //=> true
Functions are always true.
console.log(has({ foo: { bar: function(foo) {} } }, 'foo.bar')); //=> true
console.log(has({ foo: { bar: function() {} } }, 'foo.bar')); //=> true
console.log(has({ foo: { bar: new Map() } }, 'foo.bar')); //=> false
console.log(has({ foo: { bar: new Map([['foo', 'bar']]) } }, 'foo.bar')); //=> true
null
is always true, as it's assumed that this is a user-defined value, versus undefined
which is not.
console.log(has({ foo: { bar: null } }, 'foo.bar')); //=> true
console.log(has({ foo: { bar: {} } }, 'foo.bar')); //=> false
console.log(has({ foo: { bar: { a: 'a' }} } }, 'foo.bar')); //=> true
console.log(has({ foo: { bar: { foo: undefined } } }, 'foo.bar')); //=> false
console.log(has({ foo: { bar: { foo: null } } }, 'foo.bar')); //=> true
console.log(has({ foo: { bar: 1 } }, 'foo.bar')); //=> true
console.log(has({ foo: { bar: 0 } }, 'foo.bar')); //=> true
console.log(has({ foo: { bar: new RegExp() } }, 'foo.bar')); //=> false
console.log(has({ foo: { bar: new RegExp('foo') } }, 'foo.bar')); //=> true
console.log(has({ foo: { bar: new Set() } }, 'foo.bar')); //=> false
console.log(has({ foo: { bar: new Set(['foo', 'bar']) } }, 'foo.bar')); //=> true
console.log(has({ foo: { bar: 'a' } }, 'foo.bar')); //=> true
console.log(has({ foo: { bar: '' } }, 'foo.bar')); //=> false
console.log(has({ foo: { bar: } }, 'foo.bar')); //=> false
console.log(has({ foo: { bar: void 0 } }, 'foo.bar')); //=> false
console.log(has({ foo: { bar: undefined } }, 'foo.bar')); //=> false
Breaking changes
zero
always returns truearray
now recurses, so that an array of empty arrays will return false
null
now returns truePull requests and stars are always welcome. For bugs and feature requests, please create an issue.
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
(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
You might also be interested in these projects:
'a.b.c'
) paths. | homepageCommits | Contributor |
---|---|
32 | jonschlinkert |
2 | rmharrison |
1 | wtgtybhertgeghgtwtg |
Jon Schlinkert
Copyright © 2018, Jon Schlinkert. Released under the MIT License.
This file was generated by verb-generate-readme, v0.6.0, on March 03, 2018.
FAQs
Returns true if a value exists, false if empty. Works with deeply nested values using object paths.
The npm package has-value receives a total of 24,700,894 weekly downloads. As such, has-value popularity was classified as popular.
We found that has-value demonstrated a not healthy version release cadence and project activity because the last version was released a year ago. It has 1 open source maintainer collaborating on the project.
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