isIsogram.js

function isIsogram(str){
  let returner = true;
  let table = {};
 
  /* iterate through string
   count every time we see a letter
   the second time you see a letter, return false */
   
  /* for letter in string
       count every time we see a letter
       the second time you see a letter, return false  
     END for*/
  
  /* 
  for letter in string
     see if letter is in "table"
     the second time you see a letter, return false  
   END for  */
  
  
   /* 
  for letter in string
     if (see if letter is in "table")
        return false
     else
        add to "table"
   END for  */
  
  
  for (let l in str) {
    /* if (see if letter is in "table")
        return false
     else
        add to "table"*/
    
     if (str.l) {
        return false;
     } else {
        str[l] = l;
     };
  };
  
  return returner;
}