Using appendChild() to load external JavaScript.js

const script = document.createElement("script")
script.type = "text/javascript"
script.src = "script.js"
document.head.appendChild(script)

eval(script)

there is no need to use eval(script)
instead you should use

const script = document.createElement("script")
script.src = "script.js"
script.onload = function(){
    //do something
}
document.head.appendChild(script)

or

const script = document.createElement("script")
script.src = "script.js"
script.async = false
document.head.appendChild(script)

Thanks for the correction @likev!

You're absolutely right, eval() or Function() are totally optional unless you need to import the script as a string -- or for example are loading the text <script src="..."> and need to evaluate that statement.

I updated the article:
https://levelup.gitconnected.com/how-to-load-external-javascript-files-from-the-browser-console-8eb97f7db778