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In Flutter, manipulating strings is a common task, and there may be scenarios where you need to remove the last character from a string. Whether you’re working on form validation, user input processing, or any other aspect of your Flutter application, having the ability to remove the last character from a string is a useful skill. In this article, we’ll explore different approaches to do this in Flutter, with code examples.

Method 1: Using substring

One straightforward way to remove the last character from a string in Flutter is by using the substring method. The substring method takes two parameters – the starting index and the ending index. By providing the appropriat

String removeLastCharacter(String input) {
  if (input.isEmpty) {
  return input; // Return the input string if it's already empty
}

  // Use substring to get a new string excluding the last character
  return input.substring(0, input.length - 1);
}

In this example, the removeLastCharacter function takes a string input as a parameter and checks if it’s empty. If not, it uses the substring method to create a new string that excludes the last character.

Method 2: Using String Interpolation

Another concise way to remove the last character is by using string interpolation along with the substring method.

String removeLastCharacter(String input) {
  return '${input.substring(0, input.length - 1)}';
}

This approach is similar to the previous one but uses string interpolation to concatenate the substrings.

Method 3: Using replaceFirst with Regular Expression

If you’re comfortable with regular expressions, you can also use the replaceFirst method to achieve the same result.

String removeLastCharacter(String input) {
  return input.replaceFirst(RegExp(r'.$'), '');
}

Here, the regular expression .$ matches the last character in the string, and replaceFirst replaces the first occurrence of this pattern with an empty string.