Are duplicates of string-constants in JavaScript optimized by the interpreter? [duplicate]

Question

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?

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
– Bergi, Commented Jan 4, 2018 at 14:14

Scott Marcus · Accepted Answer · 2018-01-04 14:06:24Z

1

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.

answered Jan 4, 2018 at 14:06

Scott Marcus

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