Run results for: Read/Write cycle for fixed size array

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_6) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/14.0.3 Safari/605.1.15

Browser: Safari 14

Operating system: Mac OS X 10.15.6

Device Platform: Desktop

Date tested: 3 years ago

Script Preparation code:

var count = 120000;
var list = new Array(count).fill(100);

Tests:

slice immutable
var insertCount = 0; for (var i = 0; i < 10; ++i) { if (list.length > count - 1) { list=list.slice(0, count - 1) list.push(insertCount++) } else { list = [...list, insertCount++]; } } var foo = list;
splice immutable
var insertCount = 0; for (var i = 0; i < 10; ++i) { list = [...list, insertCount++] if (list.length > count) { list.splice(0, list.length - count); } } var foo = list;
shift-while immutable
var insertCount = 0; for (var i = 0; i < 10; ++i) { list = [...list, insertCount++] while (list.length > count) { list.shift(); } } var foo = list;
slice mutable
var insertCount = 0; for (var i = 0; i < 10; ++i) { list=list.slice(0, count) list.push(insertCount++) } var foo = list;
splice mutable
var insertCount = 0; for (var i = 0; i < 10; ++i) { list.push(insertCount++) if (list.length > count) { list.splice(0, list.length - count); } } var foo = list;
shift-while mutable
var insertCount = 0; for (var i = 0; i < 10; ++i) { list.push(insertCount++) while (list.length > count) { list.shift(); } } var foo = list;
circular buffer
var idx = 0; var insertCount = 0; for (var i = 0; i < 10; ++i) { list[idx] = insertCount++; idx = (idx + 1) % count; } var foo = [...list.slice(idx), ...list.slice(0, idx)];