JavaScript speed check

result by chrome

Modern Style Spent: 862 ms
Primitive Style Spent: 764 ms

result by Node

Modern Style Spent: 896 ms
Primitive Style Spent: 766 ms

test.js

var seed = [], time1 = 0, time2 = 0;
for (var i=0; i<1000000; i++) { seed.push(i); }

for (var j=0; j<10; j++) {
  time1 += runPrimitiveStyle();
  time2 += runModernStyle();
}

console.info('Modern Style Spent:', time2, 'ms');
console.info('Primitive Style Spent:', time1, 'ms');

function runModernStyle() {
  var initTime = +new Date();

  var target = [], total = 0;

  seed.forEach(function(s) {
    target.push(s);
  });

  total = target.reduce(function(a, b){
    return a + b;
  });

  console.info(total);

  return +new Date() - initTime;
}

function runPrimitiveStyle() {
  var initTime = +new Date();

  var target = [], total = 0;

  for (var i=0, len = seed.length; i < len; i++) {
    target[target.length++] = seed[i]; 
  }

  for (var j=0, len = target.length; j < len; j++) {
    total += target[j];
  }

  console.info(total);

  return +new Date() - initTime;
}