Run results for: JSON stringify vs slice vs structuredClone vs spread vs Array from

Run details:

User agent: Mozilla/5.0 (iPhone; CPU iPhone OS 16_3 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) CriOS/111.0.5563.72 Mobile/15E148 Safari/604.1

Browser: Chrome Mobile iOS 111

Operating system: iOS 16.3

Device Platform: Mobile

Date tested: one year ago

Test name	Executions per second
JSON.stringify	1018375.0 Ops/sec
slice	7496699.0 Ops/sec
Array from	3714106.0 Ops/sec
Spread	6517700.0 Ops/sec
structuredClone	729688.8 Ops/sec

Script Preparation code:

var vertices = [
      [1, 0, 0, 0],
      [0, 1, 0, 0],
      [0, 0, 1, 0],
      [0, 0, 0, 1],
    ]

var myCopy = null;

Tests:

JSON.stringify
myCopy = JSON.parse(JSON.stringify(vertices));
slice
myCopy = vertices.slice();
Array from
myCopy = Array.from(vertices)
Spread
myCopy = [...vertices]
structuredClone
myCopy = structuredClone(vertices)

Run results for: JSON stringify vs slice vs structuredClone vs spread vs Array from

JSON.stringify

slice

Array from

Spread

structuredClone