Run results for: spread vs concat vs unshift 2 to join arrays

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/101.0.4951.64 Safari/537.36

Browser: Chrome 101

Operating system: Mac OS X 10.15.7

Device Platform: Desktop

Date tested: one year ago

Script Preparation code:

var a = [1,2,3];
var b = [4,5,6];

Tests:

spread
b=[...a,...b];
concat
b=a.concat(b);
unshift (drugs)
var c = []; var aLen = a.length; var bLen = b.length; var i = 0; for (; i < aLen; i++) { c.push(a[i]); } i = 0 for (; i < bLen; i++) { c.push(b[i]); }