Published · Tagged with ECMAScript

Today, it is very common to write code like this:

const hasOwnProperty = Object.prototype.hasOwnProperty;

if (hasOwnProperty.call(object, 'foo')) {
// `object` has property `foo`.

Or to use libraries that expose a simple version of Object.prototype.hasOwnProperty, such as has or lodash.has.

With the Object.hasOwn proposal, we can simply write:

if (Object.hasOwn(object, 'foo')) {
// `object` has property `foo`.

Object.hasOwn is already available in V8 v9.3 behind the --harmony-object-has-own flag, and we’ll be rolling it out in Chrome soon.

Object.hasOwn support #