JavaScript Tutorial

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Js Add Space Before Capital Letter

In this tutorial, we cover two examples to add spaces before every capital letter in a string. This is a useful technique when you want to format a string that has no spaces between words, such as a variable name or a hashtag. In the first example, we use regular expressions (regex) to find and replace the capital letters with spaces. In the second example, we use a JavaScript custom method to loop through the string and insert spaces where needed.

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Example 1 : Javascript Add Space Before Capital Letter

In this Example, we will learn how to add a space before every capital letter in a string using JavaScript, such as "FontAwesomeIcons" to "Font Awesome Icons". To do this, you can use the following regex: /([A-Z])/g.

Javascript regex add space before capital letter

 <script>
  function insertSpaceBeforeCapitalLetters(str) {
   return str.replace(/([A-Z])/g, " $1").trim();
  }
 </script>

Run

Output of Javascript Insert space before capital letters

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Example 2 : Js Add Space Before Capital Letter Javascript Without Regex

In this second example of this tutorial, we will show you how to add a space before every capital letter in a string using JavaScript. This is a common task when you want to convert a camelCase or PascalCase string into a more readable format. We will use a custom method without using regular expressions (regex) to achieve this goal.

<script>
 function addSpaceBeforeCapital(str) {
  let result = '';
  for (let i = 0; i < str.length; i++) {
   if (str[i] === str[i].toUpperCase() && str[i] !== ' ' && i !== 0) {
    result += ' ';
   }
   result += str[i];
  }
  return result;
 }
</script>