check to see if string matches requirements

The function generateHashtag(str); is passed a string that must meet the following criteria:

If the final result is longer than 140 chars it must return false.

If the input is a empty string it must return false.

It must start with a hashtag (#).

All words must have their first letter capitalized.

Example Input to Output:

" Hello there thanks for trying my Kata" => "#HelloThereThanksForTryingMyKata"

" Hello World " => "#HelloWorld"

Here is my code so far:

function generateHashtag (str) {
    if (!str) {
        return false;
    } else {
        var los = str.toLowerCase();
        var res = los.replace(/b./g, function(m){ return m.toUpperCase(); });
    } 

    if ( res.charAt( 0 ) != '#' ) { 
        res = "# " + res;
    } else {
        res = "" + res;
    }

    if (res.length > 140) {
        return false; 
    } else {
        return res;
    }
}

This is a coding challenge from the codewar.com site. I get the following message there Test didn't pass: Unknown error . It works on js fiddle link to js fiddle

---

Does this work?

function generateHashtag (str) {
  if(!str || str.length == 0 || (str.replace(/([^a-zA-Zs])/g, "").length + 1) > 140)
    return false;

  var finalString = "";
  str = str.replace(/([^a-zA-Zs])/g, "").trim().toLowerCase().split(" ");

  for(i in str)
    finalString += str[i].charAt(0).toUpperCase() + str[i].slice(1);

  return "#" + finalString;
}

https://jsfiddle.net/c0m6bcq6/1/

链接地址: http://www.djcxy.com/p/2882.html

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