Задача 2:
/*
Fully implement the function *createFilter* so it
creates a closure over another function and returns
a function that filters an array using the passed
function in *createFilter*
*/
const createFilter = (/* needs to be implemented */) => {
/* needs to be implemented */
}
const nums = [2, 5, 19, 27, 30, 38, 40, 45, 99];
const filterUnder30 = createFilter(x => x >= 30);
const notUnder30 = filterUnder30(nums);
console.log(notUnder30); // should be [30, 38, 40, 45, 99]