Run results for: Spread Push VS Concat Reassign

Run details:

User agent: Mozilla/5.0 (iPad; CPU OS 10_0_1 like Mac OS X) AppleWebKit/602.1.50 (KHTML, like Gecko) Version/10.0 Mobile/14A403 Safari/602.1

Browser: Mobile Safari 10

Operating system: iOS 10.0.1

Device Platform: iPad

Date tested: 8 years ago

Test name	Executions per second
Spread Push	275284.4 Ops/sec
Concat Reassign	310190.6 Ops/sec
Apply Push	309255.3 Ops/sec

Script Preparation code:

var data = [
  1, 2, 3, 4,
  [1, 2, 3, 4],
  5, 6, 7, 8,
  [1, 2, 3, 4]
];

AخA
 
var data = [  1, 2, 3, 4,  [1, 2, 3, 4],  5, 6, 7, 8,  [1, 2, 3, 4]];

Tests:

Spread Push

(function fn(items){
  var result = [];
  items.forEach(item => {
    if(item.pop) {
      result.push(...fn(item));
    } else {
      result.push(item);
    }
  });
  return result;
})(data);

 
(function fn(items){  var result = [];  items.forEach(item => {    if(item.pop) {      result.push(...fn(item));    } else {      result.push(item);    }  });  return result;})(data);

Concat Reassign

(function fn(items){
  var result = [];
  items.forEach(item => {
    if(item.pop) {
      result = result.concat(fn(item));
    } else {
      result.push(item);
    }
  });
  return result;
})(data);

 
(function fn(items){  var result = [];  items.forEach(item => {    if(item.pop) {      result = result.concat(fn(item));    } else {      result.push(item);    }  });  return result;})(data);

Apply Push

(function fn(items){
  var result = [];
  items.forEach(item => {
    if(item.pop) {
      result.push.apply(result, fn(item));
    } else {
      result.push(item);
    }
  });
  return result;
})(data);

 
(function fn(items){  var result = [];  items.forEach(item => {    if(item.pop) {      result.push.apply(result, fn(item));    } else {      result.push(item);    }  });  return result;})(data);