Project3

function firstRecurringCharacter(input){
    let map={};
    for(let i=0;i<input.length;i++){
        if(map[input[i]]!==undefined){
            return input[i];
        }else{
            map[input[i]]=i;
        }
    }
    return undefined;
}
firstRecurringCharacter([1,4,3,5,1,3,4,6]);