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Description:
When fetching the region name by countryCode and regionCode, the full list of regions is first converted to contain only the
name
, dropping all other information.The iteration itself is usually not an issue, but it builds up when having to run it a couple thousand times.
Replacing the data conversion step with a direct access reduced the time per call from 5 milliseconds on a test machine to 5 microseconds. And it prevents the function from allocating any memory during the array conversion as nothing is changed.
Review