capFirstLetter.js

//make a function that takes in a string and capatalizes the first letter of every word and lowercase the rest
function capFirstLetter(str) {
  str = str.toLowerCase().split(' ');
  for(var i in str) {
    str[i] = str[i].split('');
  }
  for(var j in str) {
    var holder = str[j][0].charAt(0).toUpperCase();
    str[j][0] = holder;
    str[j] = str[j].join('');
  }
  str = str.join(' ');
  console.log(str);
}
capFirstLetter("one two three");

function capFirstLetter(str) {
  str = str.toLowerCase().split(' ')

  str = str.map(word => word[0].toUpperCase() + word.slice(1))

  return str.join(' ')
}