Using filter() Array Method to Keep Targets in an Array

If you need to implement a function to remove all values from an array that are not the same as the target value you want to return, you can use the filter() Array method like this:

var filter = function (arr, target) {
  // Write your code below


 var equalTarget = arr.filter(function(number) {
  return number == target;
});




  return equalTarget ;
}

var numbers = [1, 3, 5, 7, 5, 3, 1];
var only3 = filter(numbers, 3);
console.log(only3);
// -> [3, 3]
console.log(numbers);
// -> [1, 3, 5, 7, 5, 3, 1]