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] 
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