how to repeat code in javascript code example

Example 1: JavaScript repeat character

var a="a";
var aaa=a.repeat(3); // "aaa"

Example 2: repeat js

repeatStr = (n, s) => s.repeat(n);

Example 3: repeat a function javascript

setInterval(function(){
  console.log("Hello");
  console.log("World");
}, 2000); //repeat every 2s