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object.hasown

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object.hasown

ES spec-compliant shim for Object.hasOwn


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Maintainers
1
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14,671,740
decreased by-4.15%

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Package description

What is object.hasown?

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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object.hasown Version Badge

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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

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Last updated on 05 May 2022

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