Run results for: slice VS splice VS shift: who is the fastest to keep constant size 2

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 list = [];
for (var i = 0; i < 1000 * 1000; i++) {
  list.push(i);
}

AخA
 
var list = [];for (var i = 0; i < 1000 * 1000; i++) {  list.push(i);}

Tests:

list.push('slice');
list = list.slice(0, 1000 * 1000 / 2);

 
list.push('slice');list = list.slice(0, 1000 * 1000 / 2);

splice
list.push('splice'); list.splice(0, 1000 * 1000 / 2);
list.push('splice');
list.splice(0, 1000 * 1000 / 2);

list.push('shift');

for (var i = 0; i < 1000 * 1000 / 2; i++) {
  list.shift();
}

​x
 
list.push('shift');​for (var i = 0; i < 1000 * 1000 / 2; i++) {  list.shift();}