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//push vs concat performance
var arr = [1, 2, 3];
var obj = 5;
var i = 10000;
console.time("push");
while(i--){
  arr.push(obj);
}
console.timeEnd("push");

var arr = [1, 2, 3];
var obj = 5;
var i = 10000;
console.time("concat");
while(i--){
  arr = arr.concat(obj);
}
console.timeEnd("concat");
/*push: 1ms
concat: 667ms*/