has-value

    1.0.0 • Public • Published

    has-value NPM version NPM monthly downloads NPM total downloads Linux Build Status

    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.


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

    Install

    npm i has-value@1.0.0

    Version

    1.0.0

    License

    MIT

    Last publish

    Collaborators

    • jonschlinkert