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

Run details:

User agent: Mozilla/5.0 (iPhone; CPU iPhone OS 14_4 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) CriOS/90.0.4430.216 Mobile/15E148 Safari/604.1

Browser: Chrome Mobile iOS 90

Operating system: iOS 14.4

Device Platform: Mobile

Date tested: 2 years ago

Test name	Executions per second
native copy	608115.4 Ops/sec
immutable copy	3914269.0 Ops/sec
seamless copy	2745.4 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