Javascript

  async function sleep(duration: number, jitter: number = 0) {
    const delay = duration * 1000 + Math.floor(Math.random() * jitter);
    await new Promise(resolve => setTimeout(resolve, delay));
}
  

  let a = new Set([1, 2, 3, 4]);
let b = new Set([5, 4, 3, 2]);

let a_minus_b = new Set([...a].filter(x => !b.has(x)));
let b_minus_a = new Set([...b].filter(x => !a.has(x)));
let a_intersect_b = new Set([...a].filter(x => b.has(x)));
let a_union_b = new Set([...a, ...b]);

console.log(...a_minus_b);     // {1}
console.log(...b_minus_a);     // {5}
console.log(...a_intersect_b); // {2,3,4}
console.log(...a_union_b);     // {1,2,3,4,5}
  

  let urlParams = new URLSearchParams(window.location.search);
console.log(urlParams.has('yourParam')); // true
console.log(urlParams.get('yourParam')); // "MyParam"