(javascript) remove duplicate elements from an array. - Have the function ArrayChallenge(arr) take the array of numbers stored in arr and determine the total number of duplicate entries.

For example if the input is [1, 2, 2, 2, 3] then your program should output 2 because there are two duplicates of one of the elements.

Examples

Input: [0,-2,-2,5,5,5] Output: 3

Input: [100,2,101,4] Output: 0

PLEASE IMPLEMENT SOLUTION INTO THIS STARTER CODE below & run the answer in the console log below.

function ArrayChallenge(arr) {

// code goes here

return arr;

}

// keep this function call here

console.log(ArrayChallenge(readline()));