Benchmark: test concat vs spread+push

Script Preparation code:

var original = [1,2,3,4,5,6,7,8,9,10];
var _new = ['a', 'b', 'c', 'd', 'e', 'f', 'g', 'h'];

Tests:

Rendered benchmark preparation results:

Previous results

Test case name	Result
concat
spread+push

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Latest run results:

Run details: (Test run date: 5 years ago)

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_11_6) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/66.0.3359.139 Safari/537.36

Browser/OS: Chrome 66 on Mac OS X 10.11.6

Test name	Executions per second
concat	964.4 Ops/sec
spread+push	2384949.0 Ops/sec

test concat vs spread+push (version: 0)