class-utils

Utils for working with JavaScript classes and prototype methods.

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

Install

Install with npm:

$ npm install --save class-utils

Usage

var cu = require('class-utils');

API

.has

Returns true if an array has any of the given elements, or an object has any of the give keys.

Params

• obj {Object}
• val {String|Array}
• returns {Boolean}

Example

cu.has(['a', 'b', 'c'], 'c');
//=> true

cu.has(['a', 'b', 'c'], ['c', 'z']);
//=> true

cu.has({a: 'b', c: 'd'}, ['c', 'z']);
//=> true

.hasAll

Returns true if an array or object has all of the given values.

Params

• val {Object|Array}
• values {String|Array}
• returns {Boolean}

Example

cu.hasAll(['a', 'b', 'c'], 'c');
//=> true

cu.hasAll(['a', 'b', 'c'], ['c', 'z']);
//=> false

cu.hasAll({a: 'b', c: 'd'}, ['c', 'z']);
//=> false

.arrayify

Cast the given value to an array.

Params

• val {String|Array}
• returns {Array}

Example

cu.arrayify('foo');
//=> ['foo']

cu.arrayify(['foo']);
//=> ['foo']

.hasConstructor

Returns true if a value has a contructor

Params

• value {Object}
• returns {Boolean}

Example

cu.hasConstructor({});
//=> true

cu.hasConstructor(Object.create(null));
//=> false

.nativeKeys

Get the native ownPropertyNames from the constructor of the given object. An empty array is returned if the object does not have a constructor.

Params

• obj {Object}: Object that has a constructor.
• returns {Array}: Array of keys.

Example

cu.nativeKeys({a: 'b', b: 'c', c: 'd'})
//=> ['a', 'b', 'c']

cu.nativeKeys(function(){})
//=> ['length', 'caller']

.getDescriptor

Returns property descriptor key if it's an "own" property of the given object.

Params

• obj {Object}
• key {String}
• returns {Object}: Returns descriptor key

Example

function App() {}
Object.defineProperty(App.prototype, 'count', {
  get: function() {
    return Object.keys(this).length;
  }
});
cu.getDescriptor(App.prototype, 'count');
// returns:
// {
//   get: [Function],
//   set: undefined,
//   enumerable: false,
//   configurable: false
// }

.copyDescriptor

Copy a descriptor from one object to another.

Params

• receiver {Object}
• provider {Object}
• name {String}
• returns {Object}

Example

function App() {}
Object.defineProperty(App.prototype, 'count', {
  get: function() {
    return Object.keys(this).length;
  }
});
var obj = {};
cu.copyDescriptor(obj, App.prototype, 'count');

.copy

Copy static properties, prototype properties, and descriptors from one object to another.

Params

• receiver {Object}
• provider {Object}
• omit {String|Array}: One or more properties to omit
• returns {Object}

.inherit

Inherit the static properties, prototype properties, and descriptors from of an object.

Params

• receiver {Object}
• provider {Object}
• omit {String|Array}: One or more properties to omit
• returns {Object}

.extend

Returns a function for extending the static properties, prototype properties, and descriptors from the Parent constructor onto Child constructors.

Params

• Parent {Function}: Parent ctor
• extend {Function}: Optional extend function to handle custom extensions. Useful when updating methods that require a specific prototype.
• Child {Function}: Child ctor
• proto {Object}: Optionally pass additional prototype properties to inherit.
• returns {Object}

Example

var extend = cu.extend(Parent);
Parent.extend(Child);

// optional methods
Parent.extend(Child, {
  foo: function() {},
  bar: function() {}
});

.bubble

Bubble up events emitted from static methods on the Parent ctor.

Params

• Parent {Object}
• events {Array}: Event names to bubble up

About

Contributing

Pull requests and stars are always welcome. For bugs and feature requests, [please create an issue](../../issues/new).

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: ```sh $ npm install && npm test ```

Building docs

_(This project's readme.md is generated by [verb](https://github.com/verbose/verb-generate-readme), please don't edit the readme directly. Any changes to the readme must be made in the [.verb.md](.verb.md) readme template.)_ To generate the readme, run the following command: ```sh $ npm install -g verbose/verb#dev verb-generate-readme && verb ```

Related projects

You might also be interested in these projects:

• define-property: Define a non-enumerable property on an object. Uses Reflect.defineProperty when available, otherwise Object.defineProperty. | homepage
• delegate-properties: Deep-clone properties from one object to another and make them non-enumerable, or make existing properties… more | homepage
• is-descriptor: Returns true if a value has the characteristics of a valid JavaScript descriptor. Works for… more | homepage

Contributors

Commits	Contributor
34	jonschlinkert
8	doowb
2	wtgtybhertgeghgtwtg

Author

Jon Schlinkert

• linkedin/in/jonschlinkert
• github/jonschlinkert
• twitter/jonschlinkert

License

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

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This file was generated by verb-generate-readme, v0.6.0, on January 11, 2018.