Benchmark: reduce 20000 v2 - MeasureThat.net

Script Preparation code:

var list = [];
var LIMIT = 10000;

Tests:

spread
for(var i = 0; i < LIMIT; i++) list = [...list, {a:2}];
concat
for(var i = 0; i < LIMIT; i++) list == list.concat([{a:2}]);
push
for(var i = 0; i < LIMIT; i++) list.push({a:2});
assign to index
for(var i = 0; i < LIMIT; i++) list[list.length] = {a:2};

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
spread
concat
push
assign to index

Fastest: N/A

Slowest: N/A

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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/80.0.3987.87 Safari/537.36

Browser/OS: Chrome 80 on Linux

View result in a separate tab

Test name	Executions per second
spread	0.3 Ops/sec
concat	0.4 Ops/sec
push	477.5 Ops/sec
assign to index	209.6 Ops/sec