longestString.js

function longestString(i) {
    
    // i will be an array.
    // return the longest string in the array
    var max_elem='';
    for(j=i.length; --j;){
        if (typeof i[j] == 'string' && i[j].length>max_elem.length){
            max_elem=i[j];
        }
    }
    return max_elem;

}