1function titleCase(str) {
2    return str
3        .split(' ')
4        .map((word) => word[0].toUpperCase() + word.slice(1).toLowerCase())
5        .join(' ');
6}
7console.log(titleCase("I'm a little tea pot")); // I'm A Little tea Pot
8

1function titleCase(sentence) {
2  let sentence = string.toLowerCase().split(" ");
3  for (let i = 0; i < sentence.length; i++) {
4    sentence[i] = sentence[i][0].toUpperCase() + sentence[i].slice(1);
5  }
6  
7  return sentence.join(" ");
8}
9

1function toTitles(s){ return s.replace(/\w\S*/g, function(t) { return t.charAt(0).toUpperCase() + t.substr(1).toLowerCase(); }); }
2var str = toTitles('abraham lincoln'); // Abraham Lincoln

1function toTitleCase(str) {
2  return str.replace(
3    /\w\S*/g,
4    function(txt) {
5      return txt.charAt(0).toUpperCase() + txt.substr(1).toLowerCase();
6    }
7  );
8}
9// example
10toTitleCase("the pains and gains of self study");
11// "The Pains And Gains Of Self Study"