JSFiddle - React, Tailwind, and code Playground

JavaScript

var hoursString = "4.3|2.4|3.4|3.0|2.64|3.0|1.0|0.0|2.6|3.4|";
var hours = hoursString.split("|");

var total = 0;
for (var i = 0; i < hours.length; i++) {
    total += parseFloat(hours[i]) || 0;
}
document.body.innerHTML = total;