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Advanced JavaScript objects - Learn web development | MDN

https://developer.mozilla.org/en-us/docs/web/javascript/introduction_to_object-oriented_javascript

“In JavaScript, most things are objects, from core JavaScript features like arrays to the browser APIs built on top of JavaScript. You can also create your own objects to encapsulate related functions and variables into efficient packages and act as handy data containers.” (the page’s own description)

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