compare many number in a list, pickup the greast number

Script
function greast(numbers){
  if(numbers.length === 0){
    return 0
  }
  var max = numbers[0]
  for(var i = 1; i < numbers.length; i++){
    if(numbers[i] > max){
      max = numbers[i]
    }
  }
  return max
}

greast([2, 3, 1, 4, 5, 6, 7])