Run results for: Rest parameters

Run details:

User agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Ubuntu Chromium/53.0.2785.143 Chrome/53.0.2785.143 Safari/537.36

Browser: Chromium 53

Operating system: Ubuntu

Device Platform: Other

Date tested: 7 years ago

Test name	Executions per second
ES5 copy arguments	317888.0 Ops/sec
ES6 copy rest	266628.7 Ops/sec

Script Preparation code:

function assertEqual(v1, v2) {
  if (v1 instanceof Array && v2 instanceof Array) {
    if (v1.length != v2.length) return false;
    for (var i = 0; i < v1.length; i++)
      if (!assertEqual(v1[i], v2[i])) return false;
    return true;
  }
  return v1 === v2;
}

Tests:

ES5 copy arguments
function unary(val) { if (arguments.length !== 1) { var $a=new Array(arguments.length); for (var $i=0;$i<arguments.length;$i++) { $a[$i]=arguments[$i]; } throw $a; } return true; } try { unary(1, 2, 3, 4, true, false, "a", "b"); } catch (e) { assertEqual(e, [1, 2, 3, 4, true, false, "a", "b"]); }
ES6 copy rest
function unary(val, ...extra) { if ((val === void 0) || extra.length > 0) { throw [val, ...extra]; } return true; } try { unary(1, 2, 3, 4, true, false, "a", "b"); } catch (e) { assertEqual(e, [1, 2, 3, 4, true, false, "a", "b"]); }

Run results for: Rest parameters

ES5 copy arguments

ES6 copy rest