CTCI 1.1

CTCI_1.1

var hash_table = {};

function check_dup(name){
    for(i = 0; i < name.length; i++){
        if(name[i] in hash_table){
            return false;
        }else{
            hash_table[name[i]] = true;                 
        }            
    }
    return true;
}

alert(check_dup("al3gyu"));
​