Benchmark: array flat vs _.flatten

HTML Preparation code:

<script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.17.5/lodash.core.js"></script>

Tests:

Rendered benchmark preparation results:

Previous results

Test case name	Result
array flat
_.flattern

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Latest run results:

Run details: (Test run date: 4 years ago)

User agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/74.0.3729.169 Safari/537.36

Browser/OS: Chrome 74 on Linux

Test name	Executions per second
array flat	683236.9 Ops/sec
_.flattern	2103078.0 Ops/sec

array flat vs _.flatten (version: 0)