Run results for: Combining Arrays: Spread vs. Concat

Run details:

User agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/100.0.4896.88 Safari/537.36

Browser: Chrome 100

Operating system: Linux

Device Platform: Desktop

Date tested: 2 years ago

Test name	Executions per second
Spread	2879574.8 Ops/sec
Concat	2242182.5 Ops/sec

Script Preparation code:

var arr1 = [];
for (var j; j < 300; j++) {
  arr1.push(Math.random().toString(16).substr(2, 7));
}

var arr2 = [];
for (var j; j < 230; j++) {
  arr2.push(Math.random().toString(16).substr(2, 9));
}

var arr3 = [];
for (var j; j < 80; j++) {
  arr3.push(Math.random().toString(16).substr(2, 8));
}

var arr4 = [];
for (var j; j < 450; j++) {
  arr4.push(Math.random().toString(16).substr(2, 6));
}

console.log("Creating arrays:", arr1, arr2, arr3, arr4);

Tests:

Spread
var bigArraySpread = [...arr1, ...arr2, ...arr3, ...arr4];
Concat
var bigArrayConcat = [].concat(arr1, arr2, arr3, arr4);