Especially when dealing with DOM objects in JavaScript, there are often duplicates of one and the same string.
Should such a string saved in a global variable (or constant) or is JavaScript optimising by itself?
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Strings are immutable, so you can't tell. – Pointy Jan 04 '18 at 14:06
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DOM objects are host objects anyway so we cannot tell how they are implemented. I doubt there's a lot of duplication in the data model. – Bergi Jan 04 '18 at 14:14
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Most likely there is an intern pool that gets used, but this is completely implementation dependent since the ECMAScript spec. doesn't tell vendors how to implement the functionality.
Scott Marcus
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