JSFiddle - React, Tailwind, and code Playground

JavaScript

var finalgradeinfo = [];

var changer = function (y) {
    finalgradeinfo.push(y);
}

do {
    var entry = prompt("Enter a course code and grade seperated by a comma");

    if (entry != null && entry != "") {
        var counter;
        var entryvalid = new Array;
        entryvalid = entry.split(",");
        changer(entryvalid);
        x = true;
    } else {
        x = false;
    }
} while (x != false);

console.log(finalgradeinfo);