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Run results for: push/shift vs rotating pointer

I'm confused why replacing the entries in the array takes longer than adding to the end and removing the first entry.

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Run details:
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/115.0.0.0 Safari/537.36
Chrome 115
Mac OS X 10.15.7
Desktop
one year ago
Test name Executions per second
push -> shift 12296531.0 Ops/sec
rotating pointer 6235228.5 Ops/sec
Script Preparation code:
Tests:

  • push -> shift

  • rotating pointer

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