Dart String toUpperCase()
Syntax & Examples

Syntax of String.toUpperCase()

The syntax of String.toUpperCase() method is:

 String toUpperCase()

This toUpperCase() method of String converts all characters in this string to upper case.

Return Type

String.toUpperCase() returns value of type String.


✐ Examples

1 Convert a string to uppercase

In this example,

  1. We create a string str with the value 'Hello, World!'.
  2. We then use the toUpperCase() method to convert all characters in the string to uppercase.
  3. The uppercase version of the string is stored in upperCaseStr.
  4. We print both the original and uppercase strings to standard output.

Dart Program

void main() {
  String str = 'Hello, World!';
  String upperCaseStr = str.toUpperCase();
  print('Original String: $str');
  print('Uppercase String: $upperCaseStr');
}

Output

Original String: Hello, World!
Uppercase String: HELLO, WORLD!

2 Convert another string to uppercase

In this example,

  1. We create a string str with the value 'abcdef'.
  2. We then use the toUpperCase() method to convert all characters in the string to uppercase.
  3. The uppercase version of the string is stored in upperCaseStr.
  4. We print both the original and uppercase strings to standard output.

Dart Program

void main() {
  String str = 'abcdef';
  String upperCaseStr = str.toUpperCase();
  print('Original String: $str');
  print('Uppercase String: $upperCaseStr');
}

Output

Original String: abcdef
Uppercase String: ABCDEF

3 Convert a sentence to uppercase

In this example,

  1. We create a string str with the value 'Lorem ipsum dolor sit amet'.
  2. We then use the toUpperCase() method to convert all characters in the string to uppercase.
  3. The uppercase version of the string is stored in upperCaseStr.
  4. We print both the original and uppercase strings to standard output.

Dart Program

void main() {
  String str = 'Lorem ipsum dolor sit amet';
  String upperCaseStr = str.toUpperCase();
  print('Original String: $str');
  print('Uppercase String: $upperCaseStr');
}

Output

Original String: Lorem ipsum dolor sit amet
Uppercase String: LOREM IPSUM DOLOR SIT AMET

Summary

In this Dart tutorial, we learned about toUpperCase() method of String: the syntax and few working examples with output and detailed explanation for each example.