JSFiddle - React, Tailwind, and code Playground

by Yomi Eluwande

JavaScript

function sockMerchant(n, ar) {

		ar.sort(function(a, b){
        return a - b;
    });

    let count = 0;

    for (var i = 0; i < ar.length; i++) {
        if (ar[i] === ar[i + 1]) {
            count++
            i++; 
        }
    } 

    return count;   
}

let dome = [10, 20, 20, 10, 10, 30, 50, 10, 20];
console.log(sockMerchant(9, dome));