I just ran into a very interesting issue when someone posted a jsperf benchmark that conflicted with a previous, nearly identical, benchmark I ran.
Chrome does something drastically different between these two lines:
new Array(99999); // jsperf ~50,000 ops/sec
new Array(100000); // jsperf ~1,700,000 ops/sec
benchmarks: http://jsperf.com/newarrayassign/2
I was wondering if anyone has any clue as to what's going on here!
(To clarify, I'm looking for some low-level details on the V8 internals, such as it's using a different data structure with one vs the other and what those structures are)