How to Calculate the Sum and Average of Array Elements in JavaScript?

let sum = 0;
for (i = 0; i < elmt.length; i++) {
  sum += parseFloat(elmt[i]);
}
let average = sum / elmt.length;

let sum = elmt.reduce((a, b) => parseFloat(a) + parseFloat(b), 0);
let average = sum / elmt.length;

var i;
var elmt = new Array();

elmt[0] = "0";
elmt[1] = "1";
elmt[2] = "2";
elmt[3] = "3";
elmt[4] = "4";
elmt[5] = "7";
elmt[6] = "8";
elmt[7] = "9";
elmt[8] = "10";
elmt[9] = "11";

// Calculate sum using for loop
let sum = 0;
for (i = 0; i < elmt.length; i++) {
  sum += parseFloat(elmt[i]);
}

// Calculate average using array method
let average = sum / elmt.length;

// Display results
document.write("The sum of all the elements is: " + sum + " The average of all the elements is: " + average + "<br/>");