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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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