+Isograms.js

/*Description:

An isogram is a word that has no repeating letters, consecutive or non-consecutive. Implement a function that determines whether a string that contains only letters is an isogram. Assume the empty string is an isogram. Ignore letter case.

isIsogram( "Dermatoglyphics" ) == true
isIsogram( "aba" ) == false
isIsogram( "moOse" ) == false // -- ignore letter case
*/
function isIsogram(str){
  //...
  str = str.toLowerCase();
  for(var i = 0; i<str.length-1;i++){
  	for(var j = i+1; j<str.length; j++){
  		if(str.charAt(i) === str.charAt(j) )
  			return false;
  	}
  }
  return true;
}