define-property

What is define-property?

The define-property npm package is used to define a new property directly on an object, or modify an existing property on an object, and return the object. It is a convenience wrapper around Object.defineProperty that allows you to easily set configurable, enumerable, and writable property attributes.

What are define-property's main functionalities?

Define a new property with default attributes

This feature allows you to define a new property on an object with default attributes. The property will be configurable, enumerable, and writable.

{"object": {"foo": "bar"}, "propertyName": "newProp", "value": 123}

Define a new property with custom attributes

This feature allows you to define a new property on an object with custom attributes, such as making the property non-writable.

{"object": {"foo": "bar"}, "propertyName": "newProp", "descriptor": {"value": 123, "configurable": true, "enumerable": true, "writable": false}}

Other packages similar to define-property

object-define-property

This package provides similar functionality to define-property by allowing you to define a new property on an object. It is a direct polyfill for Object.defineProperty, which can be useful for environments that do not support the ES5 method.

property-expr

While not a direct alternative, property-expr allows you to work with property paths. It can compile strings into functions that can set properties on an object, which can be seen as a more dynamic way to define properties.

README

define-property

Define a non-enumerable property on an object. Uses Reflect.defineProperty when available, otherwise Object.defineProperty.

Please consider following this project's author, Jon Schlinkert, and consider starring the project to show your :heart: and support.

Install

Install with npm:

$ npm install --save define-property

Release history

See the CHANGELOG for updates.

Usage

Params

• object: The object on which to define the property.
• key: The name of the property to be defined or modified.
• value: The value or descriptor of the property being defined or modified.

var define = require('define-property');
var obj = {};
define(obj, 'foo', function(val) {
  return val.toUpperCase();
});

// by default, defined properties are non-enumberable
console.log(obj);
//=> {}

console.log(obj.foo('bar'));
//=> 'BAR'

defining setters/getters

Pass the same properties you would if using Object.defineProperty or Reflect.defineProperty.

define(obj, 'foo', {
  set: function() {},
  get: function() {}
});

About

Contributing

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

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

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

Related projects

You might also be interested in these projects:

• assign-deep: Deeply assign the enumerable properties and/or es6 Symbol properies of source objects to the target… more | homepage
• extend-shallow: Extend an object with the properties of additional objects. node.js/javascript util. | homepage
• merge-deep: Recursively merge values in a javascript object. | homepage
• mixin-deep: Deeply mix the properties of objects into the first object. Like merge-deep, but doesn't clone. | homepage

Contributors

Commits	Contributor
28	jonschlinkert
1	doowb

Author

Jon Schlinkert

• Connect with me on linkedin/in/jonschlinkert
• Follow me on github/jonschlinkert
• Follow me on twitter/jonschlinkert

License

Copyright © 2018, Jon Schlinkert. Released under the MIT License.

This file was generated by verb-generate-readme, v0.6.0, on January 25, 2018.