Run results for: Immutable vs Seamless vs Native - Array copying

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:89.0) Gecko/20100101 Firefox/89.0

Browser: Firefox 89

Operating system: Mac OS X 10.15

Device Platform: Desktop

Date tested: 3 years ago

Test name	Executions per second
native copy	196129.8 Ops/sec
immutable copy	2103470.0 Ops/sec
seamless copy	27863.6 Ops/sec

HTML Preparation code:

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/**
 *  Copyright (c) 2014-2015, Facebook, Inc.
 *  All rights reserved.
 *
 *  This source code is licensed under the BSD-style license found in the
 *  LICENSE file in the root directory of this source tree. An additional grant
 *  of patent rights can be found in the PATENTS file in the same directory.
 */
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  </script>

Script Preparation code:

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

Tests:

native copy
var b = native.slice().push('again');
immutable copy
var b = immutable.push('again');
seamless copy
var b = seamless.concat('again');

Run results for: Immutable vs Seamless vs Native - Array copying

native copy

immutable copy

seamless copy