function longest(str){
    // Split the string using regex
    str = str.match(/[a-zA-Z0-9]+/gi);
    // Creating a empty string to store largest word
    let largest = "";
         
    // Creating a for...loop to iterate over the array
    for(let i = 0; i < str.length; i++){
        // If the i'th item is greater than largest string
        // then overwrite the largest string with the i'th value
        if(str[i].length > largest.length){
        largest = str[i]
        }
    }
    return largest;
    }
     
console.log(longest(["abacaxi", "melancia", "banana"]));
console.log(largest(["aba", "aa", "ad", "vcd", "aba"]));
console.log(largest(["aa"]));
console.log(largest(["abc", "eeee", "abcd", "dcd"]));
console.log(largest(["aa", "bb", "cc"]));
console.log(largest(["a", "abc", "cbd", "zzzzzz", "a", "abcdef", "asasa", "aaaaaa"]));