A Tampermonkey script that removes any blacklisted courses from the page

estudij-course-remover.js

// ==UserScript==
// @name        Remove old classes from eŠtudij
// @author      Jan Plazovnik
// @include     https://estudij.um.si/
// @version     1
// @grant       none
// ==/UserScript==

(function () {
    'use strict';

    const allowedCourses = [
        "ALGORITMI V RAČUNALNIŠKI PRAKSI",
        "OSNOVE RAČUNALNIŠKEGA VIDA",
        "PROGRAMSKI JEZIKI",
        "RAZVOJ APLIKACIJ ZA INTERNET",
        "RAZVOJ PROGRAMSKIH SISTEMOV",
        "SISTEMSKA ADMINISTRACIJA",
        "MATEMATIKA I VS",
        "DISKRETNA MATEMATIKA VS"
    ]

    const getNodes = (className) => Array.from(document.getElementsByClassName(className))

    // Remove any courses that we don't want, in this case all courses that aren't whitelisted.
    getNodes("aalink")
        .filter(it => !allowedCourses.includes(it.textContent))
        .forEach(it => logAndDelete(it))

    // The site uses odd/even classes to make it more readable, this fixes that for the new list.
    getNodes("coursebox")
        .forEach((it, index) => {
            if (index % 2 == 0) {
                it.classList.remove("odd")
                it.classList.add("even")
            } else {
                it.classList.remove("even")
                it.classList.add("odd")
            }
        })


    function logAndDelete(item) {
        const wrapper = item.closest(".coursebox")
        const css = (color) => `display: inline-block; background-color: ${color}; color: #ffffff; font-weight: bold; padding: 3px 7px; border-radius: 4px;`
        if (wrapper) {
            console.log(
                `%cCourseCleaner%c Removed course %c${item.textContent}`,
                css("#e0005a"),
                "display: inline-block; font-weight: bold; padding: 3px 7px;",
                css("#ae39ff")
            )
            wrapper.remove()
        }
    }
})();