Edit fiddle - JSFiddle - React, Tailwind, and code Playground

JSFiddle - React, Tailwind, and code Playground

JavaScript

var addresses = prompt("Comma-separated address list:")
var separated = addresses.split(/\s*,\s*/)
var uniq = {}
var uniq_list = []
for (var idx = 0; idx < separated.length; idx++) {
   if (!uniq[separated[idx]]){ uniq[separated[idx]] = 1; uniq_list.push(separated[idx]) }
}
prompt("Copy/paste unique results:", uniq_list.join(', '))

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