For example, there are n=7 socks with colors ar=[1,2,1,2,1,3,2]. There is one pair of color 1 and one of color 2.
function sockMerchant(n, ar) {
//Need to initiate a count variable to count pairs and return the value
let count = 0
//sort the given array
ar = ar.sort()
//loop through the sorted array
for (let i=0; i < n-1; i++) {
//if the current item equals to the next item
if(ar[i] === ar[i+1]){
//then that's a pair, increment our count variable
count++
//also increment i to skip the next item
i+=1
}
}
//return the count value
return count
}