How do I add dynamic javascript to the head tag from a string, not a file?

I am using Javascript to generate additional custom javascript and then adding it to the HEAD tag. The code below works great adding a javascript file, but what if the script is in a variable just generated?

var scriptTag = document.createElement(\"script\");
scriptTag.setAttribute(\"type\", \"text/javascript\");
scriptTag.setAttribute(\"src\", \"myfile.js\");
document.getElementsByTagName(\"head\")[0].appendChild(scriptTag);

Thank you for your attention.

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