Run results for: Combining Arrays: Spread vs. Concat 2

Run details:

User agent: Mozilla/5.0 (Android 11; Mobile; rv:99.0) Gecko/99.0 Firefox/99.0

Browser: Firefox Mobile 99

Operating system: Android

Device Platform: Mobile

Date tested: 2 years ago

Test name	Executions per second
Spread	21671.7 Ops/sec
Concat	29696.6 Ops/sec

Script Preparation code:

var arr1 = [];
for (var j = 0; j < 300; j++) {
  var length = Math.random() * (10 - 2) + 2;
  arr1.push(Math.random().toString(16).substr(2, length));
}
console.log("Init arr1:", arr1);

var arr2 = [];
for (var j = 0; j < 230; j++) {
  var length = Math.random() * (14 - 3) + 3;
  arr2.push(Math.random().toString(16).substr(2, length));
}
console.log("Init arr2:", arr2);

var arr3 = [];
for (var j = 0; j < 80; j++) {
  var length = Math.random() * (8 - 4) + 4;
  arr3.push(Math.random().toString(16).substr(2, length));
}
console.log("Init arr3:", arr3);

var arr4 = [];
for (var j = 0; j < 450; j++) {
  var length = Math.random() * (10 - 2) + 2;
  arr4.push(Math.random().toString(16).substr(2, length));
}
console.log("Init arr4:", arr4);

Tests:

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