Dart - String toUpperCase() Function with Examples Last Updated : 07 Apr, 2025 Comments Improve Suggest changes Like Article Like Report 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: GEEKSFOR GEEKSExample 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: COMPUTERLAPTOP Comment More infoAdvertise with us B bansal_rtk_ Follow Improve Article Tags : Dart Dart-String Explore Dart Tutorial 7 min read BasicsIntroduction to Dart Programming Language 4 min read Dart SDK Installation 4 min read Dart - Comments 2 min read Dart - Variables 5 min read Operators in Dart 11 min read Dart - Standard Input Output 3 min read Data TypesDart - Data Types 8 min read Basics of Numbers in Dart 6 min read Strings in Dart 6 min read Dart - Sets 6 min read Dart Programming - Map 7 min read Queues in Dart 3 min read Data Enumeration in Dart 3 min read Control FlowSwitch Case in Dart 2 min read Dart - Loops 4 min read Dart - Loop Control Statements (Break and Continue) 4 min read Labels in Dart 2 min read Key FunctionsDart - Anonymous Functions 2 min read Dart - main() Function 2 min read Dart - Common Collection Methods 2 min read How to Exit a Dart Application Unconditionally? 2 min read Dart - Getters and Setters 3 min read Dart - Classes And Objects 4 min read Object-Oriented ProgrammingDart - this keyword 2 min read Dart - Static Keyword 3 min read Dart - Super and This keyword 4 min read Dart - Concept of Inheritance 5 min read Instance and class methods in Dart 3 min read Method Overriding in Dart 3 min read Getter and Setter Methods in Dart 2 min read Abstract Classes in Dart 4 min read Dart - Builder Class 4 min read Concept of Callable Classes in Dart 4 min read Interface in Dart 3 min read Dart - extends Vs with Vs implements 4 min read Dart - Date and Time 3 min read Using await async in Dart 4 min read Dart UtilitiesHow to Combine Lists in Dart? 3 min read Dart - Finding Minimum and Maximum Value in a List 5 min read Dart - Splitting of String 1 min read Dart ProgramsDart - Sort a List 2 min read Dart - String toUpperCase() Function with Examples 1 min read Dart - Convert All Characters of a String in Lowercase 1 min read How to Replace a Substring of a String in Dart? 2 min read How to Check String is Empty or Not in Dart (Null Safety)? 1 min read Exception Handling in Dart 3 min read Assert Statements in Dart 3 min read Fallthrough Condition in Dart 3 min read Concept of Isolates in Dart 2 min read Advance ConceptsDart - Collections 7 min read Dart - Basics of Packages 2 min read Dart - String codeUnits Property 1 min read HTML Document Object Model and Dart Programming 3 min read Like