[Solved] Load all slack members into a var in JavaScript

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Go to https://SLACK.slack.com/threads/team/ (replace SLACK with your slack group name)

Enter this in the console, it will scroll through the sidebar and insert the members from the sidebar into an array called storage 

var storage = [];
var el = document.querySelector('#team_list_scroller');
el.scrollTop = 0;
var last_scroll;
var loop = () => {
  last_scroll = el.scrollTop;
  el.scrollTop += 30;
  storage = storage.concat(
    Array.prototype.map.call(
      document.querySelectorAll('#team_list_scroller .member_details'),
      (el) => {
        let q = el.innerText.match(/\@\w+\W/);
        if ( q && !q.length ) return '';
        return q === null ? q = '@' + el.innerText.trim() : q[0].trim();
      }
    ).filter(t => t.length && t[0] === '@' && storage.indexOf(t) < 0)
  );

  if (el.scrollTop !== last_scroll) {
    requestAnimationFrame(loop);
  } else {
    console.log(storage);
  }
};
loop();

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solved Load all slack members into a var in JavaScript