Run results for: spread vs concat vs unshift (fair) to join arrays

Run details:

User agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/101.0.4951.64 Safari/537.36

Browser: Chrome 101

Operating system: Linux

Device Platform: Desktop

Date tested: 2 years 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 (forEach)
var c = []; a.forEach(el => c.unshift(el)) b.forEach(el => c.unshift(el))
unshift (spread)
var c = []; c.unshift(...a); c.unshift(...b);
push (forEach)
var c = []; a.forEach(el => c.push(el)) b.forEach(el => c.push(el))
push (spread)
var c = []; c.push(...a); c.push(...b);