Dart - String toUpperCase() Function with Examples

Last Updated : 07 Apr, 2025

The string toUpperCase() method converts all characters of the string into an uppercase letter. The string toUpperCase() function returns the string after converting all characters of the string into the uppercase letter.

Syntax:

Str.toUpperCase()

Parameter: The string toUpperCase() function doesn't accept any parameter.
Return Value: The string toUpperCase() function returns the string after converting all characters of the string into the uppercase letter.

Image Representation:

Example 1 :

Dart

void main() { 
    
    // str1 stores the string "geeks"
    String Str1 = "geeks"; 
    
    // str2 stores the string "fOr GEeks"
    String Str2 = "fOr GEeks"; 
    
    // print str1 in uppercase letter
    print(Str1.toUpperCase()); 
    
    // print str2 in uppercase letter
    print(Str2.toUpperCase()); 
}

Output:

GEEKS
FOR GEEKS

Example 2 :

Dart

void main() { 
    
    // str1 stores the string "COMPUTER"
    String Str1 = "COMPUTER"; 
    
    // str2 stores the string "laPToP"
    String Str2 = "laPToP"; 
    
    // print str1 in uppercase letter
    print(Str1.toUpperCase()); 
    
    // print str2 in uppercase letter
    print(Str2.toUpperCase()); 
}

Output:

COMPUTER
LAPTOP

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Dart - String toUpperCase() Function with Examples

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