DocsFilter.js

const links = [];
const rpLinks = [
  <div classname="header applicationsHeader">
    Rich Presence
  </div>
];

// First way

DocumentationPages.map(link => {
  if (richPresenceDoc) { rpLinks.push(element); }
  else links.push(element);
});

links.push(rpLinks);
return links;

// Second Way

DocumentationPages.filter(doc => !doc.isRP).map(link => { links.push(elementFromLink) });
Documentationpages.filter(doc => doc.isRP).map(link => { rpLinks.push(elementFromLink) });

links.push(rpLinks);
return links;