JAVASCRIPT

isogram javascript

function isIsogram(str){
  return !str.match(/([a-z]).*1/i);
}

how to do an isogram in javascript

function isIsogram(sWord)
 {
  for (iCharIndex = 0; iCharIndex < sWord.length; iCharIndex++)
    if (sWord.substring(iCharIndex + 1).includes(sWord.charAt(iCharIndex)))
      return false;
  return true;
 }