Javascript Array join() returning blank string

Question

Sorry, I am new to javascript and i'm just trying to get my feet wet.

I have used join()in the past without problems, but for some reason this join seems to return a blank string.

The information in myArray seems to be formatted correctly.

any help would be much appreciated. Thanks!

  function titleCase(str) {
  var splitArray = str.split(" ");
  var myArray = [];
  var joinArray = myArray.join(' ');

  for (var i in splitArray) {
    myArray.push(splitArray[i].charAt(0).toUpperCase() + splitArray[i].slice(1).toLowerCase());
  }

  return joinArray;
}

titleCase("capitalize the first letter of each word in this string");

You're returning joinArray, which is created at a time myArray is empty. You can assign a joined array after the loop, or just return myArray.join(' '). — Teemu
– Teemu, Commented Dec 15, 2015 at 17:48

allicarn · Accepted Answer · 2015-12-15 17:49:57Z

2

You were joining myArray before it had anything in it, and then returning it, unmodified.

  function titleCase(str) {
    var splitArray = str.split(" ");
    var myArray = [];

    for (var i in splitArray) {
      myArray.push(splitArray[i].charAt(0).toUpperCase() + splitArray[i].slice(1).toLowerCase());
    }

    return myArray.join(' ');
  }

document.getElementById('result').innerHTML = titleCase("capitalize the first letter of each word in this string");

<p id="result"></p>

answered Dec 15, 2015 at 17:49

allicarn

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MCMXCII · Accepted Answer · 2015-12-15 17:50:36Z

1

You're defining joinArray before myArray has been filled. Try moving

var joinArray = myArray.join(' ');

to the line before

return joinArray;

answered Dec 15, 2015 at 17:50

MCMXCII

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2 Comments

user3697269 Over a year ago

Thanks. that makes a lot of sense now

MCMXCII Over a year ago

No problem, happy to help.

user3697269 · Accepted Answer · 2015-12-15 17:54:18Z

1

I figured it out. Apparently position matters and the join was happening before the for loop had a chance to run.

answered Dec 15, 2015 at 17:54

user3697269

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1 Comment

allicarn Over a year ago

Please mark one of the answers above as the answer (whichever you found more useful) instead of reiterating.

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