turns the tab title into an animated marquee

titlechanger.js

const titleChanger = () => {

  const state = {
    title: '___Hi there!___'
  };

  const swap = () => {
    const parts = state.title.split("");
    const lastItem = parts.pop();
    const firstItem = parts.shift();
    state.title = [
      ...parts,
      lastItem,
      firstItem
    ].join("")
    document.title = state.title
    return state.title;
  }

  return () => {
    return {
      getState: () => {
        return state;
      },
      autoSwap: () => {
        setInterval(function() {
          swap()
        }, 200)
      },
      swap: swap
    }
  }
}

const t = titleChanger()();
t.autoSwap()