Pair of Socks problem on Hacker Rank

 

function PairOfSocks(arr) {

var obj = {}

for (var i = 0; i < arr.length; i++) {

if (obj[arr[i]] == undefined) {

obj[arr[i]] = 1

} else {

obj[arr[i]] = obj[arr[i]] + 1

}

}

var count = 0

for (var item in obj) {

var scount = Math.floor(obj[item] / 2)

count = count + scount

}

return count

}

var input = [1,2,1,2,1,3,2, 2, 0, 0]

var result = PairOfSocks(input)

console.log("result",result)