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JavaScript Guide - JavaScript | MDN - Mozilla.

The JavaScript Guide shows you how to use JavaScript and gives an overview of the language. If you need exhaustive information about a language feature, have a look at the JavaScript reference. This Guide is divided into the following chapters..

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Object.keys() - JavaScript | MDN - Mozilla.

Object.keys() returns an array whose elements are strings corresponding to the enumerable properties found directly upon object.The ordering of the properties is the same as that given by looping over the properties of the object manually..

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