The object.hasown npm package is a polyfill for the `Object.hasOwn` method, which is a standardized way of checking if an object has a property as its own (not inherited from its prototype chain). This package provides a reliable way to perform this check across different JavaScript environments, including those that do not support the `Object.hasOwn` method natively.

What are object.hasown's main functionalities?

Checking for own property

This feature allows you to check if an object has a specific property as its own. The code sample demonstrates checking for the existence of properties 'a' and 'b' on an object.

const hasOwn = require('object.hasown');
const object = { a: 1 };
const hasA = hasOwn(object, 'a'); // true
const hasB = hasOwn(object, 'b'); // false

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Changelog

Source

v1.1.4 - 2024-03-22

Commits

[meta] remove useless ESM 28440a5
[actions] remove redundant finisher 579b54d
[Deps] update es-abstract f7f9aa1
[Dev Deps] update call-bind, npmignore, tape 8a2f213
[Refactor] use es-object-atoms instead of es-abstract f0efe3b
[Dev Deps] update call-bind, tape 683b500
[Deps] update define-properties, es-abstract f74ecf2
[meta] add missing engines.node 7ca6eeb
[Deps] update es-abstract d5aa232
[Dev Deps] update aud 26fa7f9

Readme

Source

object.hasown

An ES spec-compliant Object.hasOwn shim. Invoke its "shim" method to shim Object.hasOwn if it is unavailable or noncompliant.

This package implements the es-shim API interface. It works in an ES3-supported environment and complies with the spec.

Most common usage:

var assert = require('assert');
var hasOwn = require('object.hasown');

var obj = { a: 1, b: 2 };

assert(hasOwn(obj, 'a'));
assert(hasOwn(obj, 'b'));
assert('toString' in obj && !hasOwn(obj, 'toString'));

if (!Object.hasOwn) {
	hasOwn.shim();
}

assert.deepEqual(Object.hasOwn(obj, 'a'), hasOwn(obj, 'a'));

Tests

Simply clone the repo, npm install, and run npm test

Keywords

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Last updated on 22 Mar 2024

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