JavaScript Array join() method returns an empty string

Question

JavaScript Array join() method returns an empty string

As a beginner in the world of javascript, I am just starting to dip my toes into it.

In the past, I have used join() without any issues, but now I am facing a problem where this join is returning an empty string.

Upon inspecting myArray, the data seems to be properly formatted.

Any assistance on resolving this issue would be greatly appreciated. Thank you!

  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");

javascript

Answer 1

Answer №1

When you implemented the function titleCase, you included a step to populate the array myArray with elements before it had any content, leading to it being returned in its original form.

  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>

Answer 2

When you implemented the function titleCase, you included a step to populate the array myArray with elements before it had any content, leading to it being returned in its original form.

  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>

Answer 3

Answer №2

The variable joinArray is being defined before myArray is populated. Consider moving

var joinArray = myArray.join(' ');

up a line to ensure proper data handling.

return joinArray;

Answer 4

The variable joinArray is being defined before myArray is populated. Consider moving

var joinArray = myArray.join(' ');

up a line to ensure proper data handling.

return joinArray;

Answer 5

Answer №3

After some investigation, I finally solved the issue. It turns out that the order of positioning was crucial, as the join operation was being executed before the for loop could properly run.

Answer 6

After some investigation, I finally solved the issue. It turns out that the order of positioning was crucial, as the join operation was being executed before the for loop could properly run.

JavaScript Array join() method returns an empty string

Answer №1

Answer №2

Answer №3

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