Argentinium

function RST(str){
  return str.split('').reduce((obj, val)=>{
    obj[val] = obj[val] ? obj[val]+1: 1;
    return obj;
  }, {})
}

const price = new URL(window.location).pathname === '/offer' ? 10 : 19;

const s = ['.class', '#id'];
const u = s.map(i=>`side/${i.slice(1)}.html`);