JSFiddle - React, Tailwind, and code Playground

HTML

total :&nbsp; <span id="totalFor" ></span>
<br />
total2:&nbsp;<span id="totalWhile"></span>

<br /><br />
number of for loops =  <span id="numberOfForLoops"></span>
<br />
number of while loops =  <span id="numberOfWhileLoops"></span>

JavaScript

array = [1.2344, 2.47373, 3.444];

var total = 0,
    total2 = 0,
    i = array.length,
    whileLoops = 0,
    forLoops = 0;

while (i--) {
    whileLoops++;
    total += array[i];
}

for (var i = 0, len = array.length; i < len; i++) {
    forLoops++;
    total2 += array[i];
}

document.getElementById('totalFor').innerHTML = total;
document.getElementById('totalWhile').innerHTML = total2;

document.getElementById('numberOfForLoops').innerHTML = whileLoops;
document.getElementById('numberOfWhileLoops').innerHTML = forLoops;