filter

filter with normal function

let numbers = [1, 2, 3, 4];

function check(n) {
  return true;
}

let numbers2 = numbers.filter(check);

console.log(numbers2);

//[1, 2, 3, 4]

filter with arrow

let numbers = [1, 2, 3, 4];

let result = numbers.filter((n) => n >= 3);

console.log(result);
//[ 3, 4 ]