Algorithm Challenge - Title Case a Sentence


I’ve just completed the “Title Case a Sentence” algorithm challenge, and although I found it reasonably easy in terms of logic, I’m wondering if there is a cleaner way to approach the solution compared to the code that I have written. My solution was:

function titleCase(str) {
  // return an array containing all words in str, converted to lower case
  var map1 = str.split(" ").map(function(val) {
    return val.toLowerCase();
  // return an array containing all words in map1, with the first letter capitalized
  var map2 = {
    var firstUpper = val[0].toUpperCase();
    var valRemain = val.slice(1);
    return firstUpper.concat(valRemain);
  // return map2 as a string
  return map2.join(" ");

titleCase("I'm a little tea pot");

Is there a cleaner way of doing this? Or is my solution ok in terms of code best practice/readability?

Any feedback is very welcome.


You could do it in a single map function by toUpperCaseing the first letter and toLowerCaseing the remainder instead of making one pass through to lowercase it and another pass through to capitalize the first letter.

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I found this solution Here.

function toTitleCase(str)
    return str.replace(/\w\S*/g, function(txt){return txt.charAt(0).toUpperCase() + txt.substr(1).toLowerCase();});
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Because @th3s0ysauc3 didn’t ask to see other solutions, I have added a spoiler blur to your post.

Thanks both! I’m going to refactor by using a single map function.

It appears that some sleep has helped me solve this quickly using only a single map function:

function titleCase(str) {
  var map = str.split(" ").map(function(val) {
    return val[0].toUpperCase() + val.slice(1).toLowerCase();
  return map.join(" ");

titleCase("I'm a little tea pot");

Thanks for the guidance!