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How to Append or Concatenate Strings in Dart?

Last Updated : 07 Apr, 2025
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In Dart, the concatenation of strings can be done in four different ways:

  • Using the ‘+’ operator.
  • Using string interpolation.
  • By directly writing string literals.
  • Using the .join() method on a list of strings.

1. Using the ‘ + ‘ Operator

In Dart, we can use the ‘+’ operator to concatenate the strings.

Example:

Dart 
// Main function
void main() {
    
    // Assigning values
    // to the variable
    String gfg1 = "Geeks";
    String gfg2 = "For";
    
    // Printing concatenated result
    // by the use of '+' operator
    print(gfg1 + gfg2 + gfg1);
}

 

Output:

GeeksForGeeks


2. By String Interpolation

In Dart, we can use string interpolation to concatenate the strings.

Example:

Dart 
// Main function
void main() {
    
    // Assigning values to the variable
    String gfg1 = "Geeks";
    String gfg2 = "For";
    
    // Printing concatenated result
    // by the use of string
    // interpolation without space
    print('$gfg1$gfg2$gfg1');
    
    // Printing concatenated result
    // by the use of
    // string interpolation
    // with space
    print('$gfg1 $gfg2 $gfg1');
}

 

Output:

GeeksForGeeks
Geeks For Geeks


3. By Directly Writing String Literals

In Dart, we concatenate the strings by directly writing string literals and appending.

Example:

Dart 
// Main function
void main() { 
    
    // Printing concatenated
    // result without space
    print('Geeks''For''Geeks');
    
    // Printing concatenated
    // result with space
    print('Geeks ''For ''Geeks');
}

 

Output:

GeeksForGeeks
Geeks For Geeks


4. By List_name.join() Method

In Dart, we can also convert the elements of the list into one string.

list_name.join("input_string(s)");

This input_string(s) is inserted between each element of the list in the output string.

Example: 

Dart 
// Main function
void main() {
    
    // Creating List of strings
    List<String> gfg = ["Geeks", "For", "Geeks"];
    
    // Joining all the elements
    // of the list and
    // converting it to String
    String geek1 = gfg.join();
    
    // Printing the
    // concatenated string
    print(geek1);
    
    // Joining all the elements
    // of the list and converting
    // it to String
    String geek2 = gfg.join(" ");
    
    // Printing the
    // concatenated string
    print(geek2);
}

 

Output:

GeeksForGeeks
Geeks For Geeks


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How to Replace a Substring of a String in Dart?
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