function accum(s) {
  /* 
    a place to store result
    iterate over s
      // append the current letter times i+1 to the result
        // capitalise first letter
        // append a dash if not last letter
  */
  
  let result = "";
  
  
  for (let i = 0; i < s.length; i++) {
    const counter = i +1;
    result += s[i].toLowerCase().repeat(counter)
    
    if (i !== s.length -1) {
      result += "-"
    }
    
    
  }
  
  return result.replace(/(^\w)|\-\w/g, function(c) { return c.toUpperCase(); })
  
}



console.log(accum("hola"))