staticVoidMan

// I re-typed what I saw in reference 3 below,
// went to Liked videos page on YouTube[1] while logged in,
// pasted that into browser dev tools console (Google Chrome Version 97.0.4692.99 (Official Build) (x86_64)),
// pressed enter, and it seemed to do its thing, for the most part
// (when I refreshed the page, there was still 1 video remaining).

// [1] as of 2022-01-23 that’s at https://www.youtube.com/playlist?list=LL

// context: https://twitter.com/QiaochuYuan/status/1485164256970510340
// references:

staticVoidMan

How to download your Udemy course videos using youtube-dl

$ youtube-dl --list-extractors | grep udemy

Steps

1. Get link to the course to download. e.g. https://www.udemy.com/course-name/
2. Login into udemy website, save the cookie from chrome using Chrome (Cookie.txt)[1] export extension. Save it to file udemy-cookies.txt
3. Get the link of the video that you want to download. usually in format. Use the command provided below where you have to replace the {course_link} and {path_to_cookies_file} with respective paths.

$ youtube-dl {course_link} --cookies {path_to_cookies_file}

staticVoidMan

func performUsingGroup() {
    let dq1 = DispatchQueue.global(qos: .default)
    let dq2 = DispatchQueue.global(qos: .default)
    let group = DispatchGroup()
    
    for i in 1...3 {
        dq1.async(group: group) {
            print("\(#function) DispatchQueue 1: \(i)")
        }
    }