test if it works

incomleteIsograms.js

function isIsogram(word) {

if (word == "" || word <= 0) {
return false;
}

word.toLowerCase();

var i, j;

for (i = 0; i < word.length; i += 1) {

for (j = i + 1; j < word.length; j += 1) {

if (word[i] == word[j]) {
return false;
}
}

}
return true;