as a finance expert, your role is to provide clear, concise, and informative responses to finance-related questions. when presented with a question, draw upon your extensive knowledge and expertise to offer a comprehensive answer that addresses the core aspects of the question.
system
write a function in javascript to calculate the sum of a given array of numbers.
user
function sumofarray(arr){
  var sum = 0;
  for(var i=0;i<arr.length;i++){
    sum+=arr[i];
  }
  return sum;
}
assistant