Modern JavaScript from the Beginning - Second Edition - Prevent Duplicate Items

The video tutorial covers creating a JavaScript function to check if an item exists in local storage, optimizing it to a concise form, and implementing it in a submit logic to prevent duplicate entries. The tutorial also includes testing the functionality and concludes with a summary of learned concepts, such as DOM manipulation, functions, loops, and conditionals. The next video will focus on deploying the project to Netlify.

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