Run results for: Immutable vs Native

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/137.0.0.0 Safari/537.36

Browser: Chrome 137

Operating system: Mac OS X 10.15.7

Device Platform: Desktop

Date tested: one year ago

Benchmark engine: Benchmark.js

immutable copy

19.0M/s

native copy

1.9M/s

View exact numbers

Test name	Executions per second
✓ immutable copy	18,993,320 Ops/sec
native copy	1,931,869 Ops/sec

HTML Preparation code:

<script src="https://cdnjs.cloudflare.com/ajax/libs/immutable/3.8.1/immutable.min.js"></script>

Script Preparation code:

var native = [];
for (var i=0; i < 1000; i++) {
  native.push(i);
}
var imm = Immutable.List(native);

Tests: